Duct

SPECIFICATIONS FOR DRY TYPE TRANSFORMERS 1.0 SCOPE

1.1 This specification covers supply, installation, testing and commissioning of dry type cast resin transformer. 2.0 CODES AND STANDARDS 2.1 Unless otherwise specified equipment shall conform to the following latest applicable standards: IS 11171, 1985 Specification for cast resin transformer IS 2026 part 1, 1977: Specification of power transformers-General IS 2026 part 2, 1977: Specification of power transformers- Temperature rise IS 2026 part 3, 1981: Insulation levels and dielectric tests IS 2026 part 4, 1977: Terminal markings, Tapings and connections IS 2026 part 5, 1994: Transformer / Reactor bushings – Minimum external clearance in air specification. IS 6600,1972: Guide for loading of oil immersed Transformer IS 3639,1966: Specification for fittings and accessories for power Transformer IS 2099,1986 : Bushings for alternating voltages above 1000 Volts IS 7421: Bushings for Alternating Voltages below 1000 Volts IS 3347,1979: Dimensions for porcelain and transformer bushings IS 1271,1985: Thermal Evaluation and classification of electrical insulation IS 8468,1977: On load Tap changer IS 13947: Low voltage switchgear and control gear. IS 5: Specification for painting and colour shade 2.2 Equipment offered shall be complete with all currently applicable statutory requirement, regulations and safety codes Indian electricity Rules, Fire Insurance Association and electrical Inspector

3.0 PRECEDENCE: 3.1 In case of conflict arising out of various documents/ requirements, the following will be the order of precedence: 1.Enclosed Data Sheet 2.Drawings 3. This specification 4.Standards specified here in 5.Standards not specified here in 6.Industry practices 4.0

OPERATION

Transformers shall operate without injurious heating at the rated KVA at any voltage within ± 10 percent of the rated voltage of that particular tap. Transformers shall be capable of delivering the rated current at a voltage equal to 105 percent of the rated voltage without exceeding the limiting temperature rise. Transformers shall operate below the knee of the saturation curve at 110 percent voltage to preclude ferro - resonance and non-linear oscillations.

Transformers shall be capable of operation continuously in accordance with the applicable standard loading guide at their rated KVA and at any of the specified voltage ratio Under these conditions, no limitations by terminal bushings, tap links other auxiliary equipment shall apply. The neutral terminal of windings with star connection shall be designed for the highest over current that can flow through this winding. The transformers shall be designed with particular attention to the suppression of harmonic voltage, especially the third and fifth so as to eliminate wave form distortion and any possibility of high frequency disturbances reaching a magnitude as to cause interference with communication circuits.

5.0

CONSTRUCTION 5.1 General

Transformer shall be air insulated dry type Cast Resin type suitable for indoor Installation as mentioned in the enclosed data Sheet. Exposed parts shall not leave pockets, where water can accumulate. Identical parts, particularly removable ones, shall be interchangeable. All parts of the body, cores shall be of robust design capable of withstanding any shocks to which they may be subjected during lifting, transport, installation and service. Noise and vibration shall be limited to low level. The transformers shall be provided with flanged/ plain wheels as specified in the Data Sheet. These wheels shall be suitable for being turned through an on 90 deg. and locked in that position when the tank is jacked up. Rating and diagram plates of stainless steel shall be provided on LT box of the transformer. Rating and diagram plate shall be riveted to the transformer enclosure at an average height of about 1500 mm above the plinth level. The rating diagram plate shall bear data as specified in Part-3 of IS 2026 or relevant International Standard. The plate shall also bear name of purchaser. It shall give the correct physical relationship of the terminals. A plate showing the location and function of all valves and air release cocks or plugs shall also be provided. 5.2 CORE The design of the magnetic circuit shall be such as to avoid static discharges development of short circuit paths within itself or to the earthing clamping structure and the production of flux components at right angles to the plane of the laminations which may cause local heating. The magnetic circuit shall be of "core type" construction. The core shall be built out of high grade, non ageing, low loss, high permeability cold rolled grain oriented silicon steel laminations. Each lamination shall be coated with insulation which is unaffected by the temperature attained by the transformer during service. Core laminations shall be annealed and burrs removed after cutting. Cut edges shall be insulated. The core and coil assembly shall be dried out and impregnated under vacuum insulated by resin/cast in insulated resin. The final assembled core shall be free from distortion. It shall be rigidly clamped to ensure adequate mechanical strength and to prevent vibrations during operation. The core shall be provided with suitable arrangement for lifting the complete core and coil assembly. Cores shall be with cold rolled steel having very low iron loss. 5.3 ENCLOSURE The enclosure shall be of CRCA sheet and painted as detailed in the enclosed Data Sheet. The material used for gaskets shall be cork neoprene or nitrite betel rubber gasket. Suitable mechanical stops shall be provided to prevent crushing of gaskets. All-wheels should be detachable and be made of cast iron. Lifting eyes or lugs shall be provided on all parts of the transformer, which require independent handling, during loading, unloading, assembly or dismantling.

5.4 WINDINGS HV & LV winding and earthing connections shall be of electrolytic grade copper. Materials used in the insulation and assembly of the windings shall be of non-hygroscopic, non catalytic and chemically inactive and shall not soften or otherwise be affected under the operating conditions. The insulation shall be of class F or higher. All taps, where specified, shall be provided on the HV winding. The cast resin transformers shall meet the partial discharge requirements as specified in IS:11171. The winding shall be designed to reduce to a minimum the out-of-balance forces in the transformer at all voltage ratios at all operating conditions. High voltage end windings shall be suitably braced to withstand short circuit stresses and stresses set up by surges. Insulation of L.V. winding shall be adequate to withstand surge voltages appearing across them as a result of transfer due to an impulse striking on HV terminals. The conductors shall be transposed at suitable intervals in order to minimize eddy current and to equalize the distribution of current and temperature along with windings. The windings shall be so designed that all coil assembly of identical voltage rating shall be _ interchangeable and field repairs to the windings can be made without special equipments. 6.0 EARTHING Internal earthing of all metal parts of the transformer with the exception of the individual core laminations, core bolts associated individual clamping plates shall be earthed. Flexible earthing braid shall be provided between all metal parts joined with gaskets. 2Nos. separate earthing pad/ terminals shall be provided on the HV cable box for armour earthing from inside and for owners grid earthing connection from outside. Earthing strip from earthing bush upto earthing terminal shall be provided. The terminal of the neutral, shall be distinctly marked on secondary in accordance with the connection diagram fixed on the transformer which shall conform to latest IS 2026 (Part I to IV). The framework and clamping arrangements of core and coil shall be securely earthed inside the enclosure by copper strap connection to the enclosure. 7.0 TAP CHANGING GEAR FOR VOLTAGE CONTROL

Tap changing shall be done by means of off circuit tapping links provided on HV winding and the tapping Range shall be +5% to -5% in steps of 2.5% 8.0 HV WINDING TERMINATION Transformer shall be provided with in-built cable box. 9.0 LV WINDING TERMINATION The LV winding terminations shall be of an air-insulated box. The LV terminal box shall be suitable for busbar trunking.. LV box shall have sufficient space to facilitate termination and to accommodate, bus bar links of adequate current-carrying capacity and suitable length shall be provided for easy connection 10.0

TEMPERATURE INDICATORS

Temperature monitoring system, shall be supplied with temperature sensors fitted in each limb. Temperature monitoring system shall initiate an alarm and trip for winding over temperature. Two contacts shall be provided. One shall be used for alarm the other for trip.

Alarm and trip temperatures shall be site settable. A temperature indicating device shall also be provided. The device shall have ±2% accuracy. The temperature sensors shall be connected and wired to a terminal strip in the marshalling box. The indication unit and tripping unit for monitoring shall be mounted in the marshalling box. 11.0

MARSHALLING BOX

A sheet steel vermin-proof, well ventilated and water proofing marshalling box shall be provided for transformer ancillary apparatus. The marshalling box shall be of weather proof construction. The marshalling box shall be complete with necessary cable glands and cable lugs. The marshalling box and components shall comply with the requirements specified for control cabinets indicated elsewhere in this specification. The marshalling box shall accommodate temperature indicators with terminals and gland plates for incoming & outgoing cables. Marshalling box shall be provided with toughened glass visor to facilitate the reading of temperature indicators. Marshalling box shall be provided with cubicle illuminating lamp along with control switch & door limit switch. All spare contacts and terminals shall be wired upto the terminal block. 20% spare terminals shall be provided.

12.Neutral earthing: One neutral terminal inside the cable box chamber and a separate neutral terminal outside shall be provided for earthing of transformer winding neutral on the secondary side. The neutral terminal shall be complete with connector block assembly for easy termination of earth strip. Arrangement for supporting 2 runs of 50 x 6 mm copper, upto grade level, from neutral terminal connection installed outside shall be provided. 13.0 PAINTING: All interiors and exteriors of switchgear/transformers/enclosures/tanks/breaker mechanisms, etc., shall be finished and painted to produce a neat, fire resistant and durable surface which would prevent rusting and corrosion. Sheet metal components shall be pre-treated using the seven phosphating process consisting of de-greasing, acid pickling, de-rusting, phosphating and passivation including repeated rising in between. On completion of passivation of the components they shall be preheated and then epoxy powder coated with Siemns grey RAL 7032 shade. Thickness of painting shall be minimum 75-80 microns. 14.0 ACCESSORIES Transformer shall be provided with the following accessories: Rating and Diagram Plate Lifting lugs/ arrangement Warning Plate Two earthing terminals on opposite sides of the transformer enclosure Base channel Off Circuit tap links Winding temperature indicator with RTD sensor Marshalling box 4 nos.Bi-directional Rollers 10) Inspection cover 15

INSPECTION AND TESTING

The Engineer in charge or his authorized representative reserves the right to witness all the routine tests and the contractor/ supplier shall give two weeks notice prior to commencement of tests.

All apparatus, instruments etc. required for tests shall be provided by the contractor/ supplier and shall have been checked and tested for accuracy during the twelve month period prior to the test bearing tag number of the competent authority. Inspection and acceptance of any equipment under this specification by the purchaser shall not relieve the supplier of his obligation of furnishing equipment in accordance with the specification and shall not prevent subsequent rejection if the equipment is found to be defective. 16. Routine tests The following Routine tests shall be conducted on the transformer: Measurement of Winding Resistance. Measurement of voltage ratio, polarity and phase relationship. Measurement of impedance voltage Measurement of no-load loss and current. Load loss. Measurement of Insulation Resistance. Separate source voltage withstand test. Induced over voltage withstand test. 2.5kV withstand test for all wiring Four copies of test certificates shall be required for all tests performed on the transformer. 17 .Type tests: The transformers offered should be a type tested product in line with standard and technical specifications. The tenderer shall furnish the following type tests reports for an identical capacity transformer along with General arrangement drawing, rating diagram plate and internal constructional details while submitting the offer: Impulse Voltage Withstand Test. Temperature rise test. Short circuit test. Heat Run Test 18.0 DRAWINGS AND DOCUMENTATION After the order/ LOI is placed, the contractor/vendor shall submit within 10 days sets to of the following drawings for approval: 1) A drawing showing plan, elevation and side view, indicating all dimensions, transformer fittings, accessories etc. 2) Core details drawing. 3) Rating and diagram plate. 4) G.A. of Marshalling box. 5) G.A. of H.V. cable box. 6) Bus duct connection diagram7) HV and LV Bushing drawing. 8) Schematic wiring diagram of marshalling box. 9) Index Sheet of the above drawing. 10) Schematic of control cabinet. The drawing shall be of A-3 (420 x 297 mm) or A4 size only. The bidder should also supply along with his offer the pamphlets/ literatures etc. in duplicate for all bought-out equipment. One print of each drawing will be returned to Contractor/ vendor after marking all necessary corrections, changes and required clarifications. Contractor/ vendor shall incorporate these within five days and send five prints of each drawing for final approval. Contractor/ vendor shall submit six copies of instruction manuals on installation, maintenance and operation of transformer and control devices mounted on the transformer and final approved as described above. Contractor/ vendor shall also submit 2 sets of CDs containing all drawings sketches AutoCAD Rel 14/2000 format and data in MS Office/WIN98/2000 format.

19.0 DATA SHEET The enclosed Data Sheets indicate detailed technical and quantity requirements. 20.0 QUALITY ASSURANCE Contractor/ supplier shall submit the Quality Assurance Plan before commencement of Work for approval. The approved Quality Assurance Plan. shall form the basis of Quality Assurance and manufacturer shall follow the same to ensure total conformity to owner's requirement.

DATA SHEET FOR DRY TYPE TRANSFORMERS No.

Description

Unit

Technical Particulars Specification

I

1.0

GENERAL

1.1

Application

1.2

Type

Insulation

Cast Resin

1.3

Rated output

KVA

1250KVA

1.4

Quantity required

Nos.

Two

1.5

Installation

Indoor/ Outdoor

Indoor

1.6

No load transformer ratio

kV/kV

11/0.433

1.7

Number of phases

Nos.

Three

1.8

Rated frequency

Hz

50

1.9

Type of cooling

AN

AN

2.0

WINDING

2.1

Type of transformer

2-wdg/ 3wdg/ Auto

2 winding

2..2

Material of conductor

Distribution Transformer

Electrolytic Cu conductor

Bidders configuration

2.3

Method of connection

HV winding

Delta

2.4

Method of connection

LV winding

Star

2.5

Vector group

Dyn 11

2.6

LV Neutral

Solidly earthed

2.7

Insulation of Windings H.V kV and L.V. One minute power (r.m.s) Frequency withstand voltage (dry and wet) 1.2/50 micro second full kV wave impulse withstand (peak) voltage

H.V 28

2.8

L.V 2.5

75

3.0

TAP CHANGER

3.1

Tap changer

3.2

Tapping on winding HV/ LV HV

3.3

Type of Tap Changer

OLTC/ OCTC/

Off Circuit links

3.4

Tap range

%

+5% to -5 %

3.5

Tap step

2.5%

2.5%

4.0

SYSTEM DATA

4.1

Nominal System Voltage on HV side

kV

11

4.2

Highest System Voltage on HV side

kV

12

4.3

Nominal System Voltage on LV side

kV

0.433

4.4

Highest System Voltage on LV side

kV

0.5

4.5

Fault level on HV side

kA

25 kA for l sec

4.6

Fault level on LV side

kA

50 kA for lsec

4.7

System Neutral on HV side

By means of links

Off-Circuit link

-

4.8

System Netitral on LV side

5.0

TERMINATIONS

Solidly Earthed

Terminal connection HV termination

Busduct/ Cable Box

In-built cable box

5.2

Entry

Top/Bottom :

Bottom

5.3

Termination size

5.4

LV termination

Busduct / Cable Box

5.5

Entry

Top/ Bottom

5.6

Termination size

6.0

NEUTRAL

6.1

Transformer Neutral on HV side

6.2

Transformer Neutral on LV side

6.3

EARTH BUS

6.3.1

Material

Electrolytic Cu ccCuCopper

6.3.2

Size

2 no 50x6 mm strip

7.0

TEMPERATURE RISE

7.1

Ambient temperature

Deg C

50

7.2

End Temperature after rise

Deg C

Deg C 90 deg C ClassF.

8.0

PAINTING

8.1

Paint type

Epoxy/ Synthetic enamel

Epoxy

5.1

Suitable for 11 kV (E) grade cable, 3Cx 185 sq.mm busduct Top

Suitable for 1.1 kV (E) grade . busduct

Solidly Earthed

.

8.2

Paint Shade

9.0

MOVEMENT

9.1

Type of Wheels

9.2

Wheel gauge

9.3

Direction of Wheels

10.0

Siemens grey RAL 7032

Plain/ Flanged

Plain As per site requirement

Unidirectional/ Bidirectional

Bidirectional

Miscellaneous

10. l

Accessories

Reqd/ Not Reqd

Required

10.2

Spares

Reqd/ Not Reqd

Not Required

10.3

Configuration of HV/LV

degrees

10.4

Routine tests to be carried out

Yes/No

As per site require ment Yes

11.0

No Load Loss

KW

11.1

Full Load Loss

KW

12.0

% impedance

As per IS

13.0

Degree of protection for enclosure

5 % at 75 degC IP23

Item I.2 SPECIFICATIONS FOR SUPPLY, INSTALLATION, TESTING AND COMMISSIONING OF 11 KV VCB SWITCHGEAR IN SUBSTATION AT BHAVINI 500 MWe PFBR CONSTRUCTION SITE.

1.0

Intent of Specification: This specification covers the Manufacturing, testing at manufacturer's works, packing, transportation by road, delivery at site, unloading, handling and storage at site, complete installation, testing and commissioning of 11 kV Indoor Metal clad Switchgear with Vacuum Circuit Breakers and associated work in Sub-Station at BHAVINI plant site. This scope includes the following schedule of quantities SCHEDULE OF EQUIPMENT

2.0

Scope of Work: 2.1

Scope of Supply: The scope of supply includes the following: One set 11 kV metal clad switchgear with vacuum circuit breaker consisting of 7 breaker section. All relevant data, drawings and instruction manuals etc.,

2.2

Scope of Services: The scope includes the items of work to be performed for all equipment and materials furnished under this specification for the satisfactory completion of the work to meet the intent of the specification and guaranteed performance of the equipment. The scope is not however limited to the items detailed below:

2.2.1

2.2.2.

2.2.3 2.2.4 2.2.5 2.2.7 2.2.8 2.2.9 2.2.10

3.

Manufacture, testing at manufacturer's works, packing and dispatch. The contractor shall furnish all necessary supporting structures anchoring bolts/arrangement etc for equipment being supplied by him.

Transportation to site and insurance. Receiving at site, unloading, handling, opening .inspecting, reporting and submitting claims in case of damages and short supply items. Arranging to repair and / or reordering all damaged and short supply items. Storing at site with suitable weather protection and transportation at site up to foundations. Complete erection of all equipment. Final check up, testing and commissioning. Energisation of the Switchgear shall be carried out only after obtaining the written approval of CEA. Supply of necessary spares and special tools required, if any. Obtaining written acceptance from the Engineer —In-Charge after successful completion of testing and commissioning.

Quality Control, Pre-Despatch Inspection and Testing of Material Received at Site:3.1

All the items covered by this specification to be supplied by the Contractor Manufacturer shall be offered for Pre-Dispatch inspection to the Engineer - In- Charge or his authorized representative. Items/Components found unsatisfactory in workmanship or materials shall be removed by the contractor and replaced at no extra cost with items/components which are satisfactory.

.

3.2

In case, if any one of the above equipment suffers from damage or loss of components the same will be procured by the Contractor and made good, failing which the Engineer-In-Charge will carry out the repair / replacement and recovery will be effected towards the cost of repair/replacement from the contractor's Running Account Bill.

DETAILED SCOPE AND DESCRIPTION OF WORK:

4.0

The items of work covered in the Schedule of Quantities are described hereunder. All the material required for the work shall be supplied by the Contractor. The work shall be carried out meeting the requirements in this section and tested in accordance with the test schedule. Supply, Installation, testing and Commissioning of 11 kV indoor Metal clad Switchgear with Vacuum Circuit Breakers: General: The VCB Switchgear offered shall be of approved make and the manufacturer shall have the in-house facilities/ infrastructure for fabrication, surface treatment, painting and testing of the assembled switchgear. The manufacturer shall also have to provide adequate aftersales service. The manufacturer should have at least minimum 3 year experience in the manufacture of same type of equipment and are in service and offering trouble free performance. Switchgear Cubicle Requirements: . 1 set 11KV switchgear with . 7 nos of VCB Indoor cubicle, fully draw out type consisting of the following: 4.1.0 Each circuit breaker cubicle shall have a. Shunt trip coil suitable for operation 48 V DC. b. Spring charging mechanism with motor suitable for Operation on 240 V AC and with manual spring charging facility. c. Closing coil suitable for 48 V DC d.

.

Circuit breaker and associated mechanism mounted in a moving carriage which shall be drawn out horizontally. e. Interlocking provision. f. Close/trip switch for electrical operation. g. Mechanical trip knob/push button for actuation in emergency. h. Mechanical indication for carriage position i.e. Test/service position i. Mechanical indication for spring condition and ON/OFF positions of circuit breaker. j. Epoxy/FRP segregation barriers between the poles k Set of breaker auxiliary switch with 3 sets of NO and NC spare contacts over and above the functional requirements.

l. One number lockable local remote selector switch. m. One number space heater (240V AC ) with thermostat ON/OFF control switch, MCB and fuse. n. OFF,ON,AUTO TRIP, CB IN SERVICE, CB IN TEST, SPRING CHARGES, TRIP UN HEALTHY indication LED lamps. Voltage indicator as per normal convention and as approved. Push button for checking the lamp healthiness. O. Insulated handles/levers for spring charging operation and drawing out operation. The insulation shall be heat shrinkable “Raychem” sleeve suitable for the appropriate voltage.

4.1.1

2 Nos. Incomer cubicle each Comprising of

4.1.1.1

One No. 3 Pole 12kV 630A Vacuum Circuit Breaker complete with rupturing capacity of 25kA at 12kV equipped with the following:

4.1.1.2

Two Nos. epoxy resin cast 100 VA, 11 kV /l 10 V, class-1 potential Transformers with LT & HT HRC fuses. LT fuses shall be easily accessible from the front.

4.1.1.3

Epoxy resin cast current transformers with duel cores as follows: a. 3 Nos. 15 VA, 5P20, 250/125/5 Current transformer for protection b. 3 Nos. 15 VA, Class -1, 250/125/5 Current transformer for metering

4.1.1.4

Relays as follows: a) 1 No. triple pole over current and earth fault relay with IDMT & Instantaneous element type CDG 63 of approved make. b) 1 No. under voltage relay VDG 13"of approved make c) 1 No. Tripping Relay VAJH 13 of approved make d) 1 No. Trip Circuit Supervision Relay VAX31 of approved make f) Meters as follows: a. 1 No. Electronic Trivector Meter ER-300 N of with suitable software and optional cable for downloading data, suitable for 110 Volts AC supply from PT b. 1 No. 0-15000V range voltmeter, class-1 with sector switch. c. 1 No. 0-250/125 A dual range ammeter, class-1 with Selector switch and labels ngraved .indicating the Ratio on both the sides.

4.1.1.5 Cable Termination facility for termination for 3Core 240Sqmm 11KV XLPE insulated UG cable with suitable gland plate for fixing cable gland. 4.1.2.0 1 No. BUS COUPLER CUBICLE COMPRISING OF; 4.1.2.1 One No. 3 pole 12 KV Vacuum Circuit Breaker complete with rupturing capacity of 25 kA at 12 kV with the following. 4.1.2.2 Epoxy resin cast current transformers as follows: a. 3 Nos. - 15VA, 5P20, 250/125/5-5A Current Transformers for 0/C& E/F protection. 4.1.2.3 Relays as follows: a. 1 No. triple pole over current and earth fault relay with IDMT & Instantaneous element type CDG 63 of approved make. b. One number tripping relay VAJH 13 of approved make c. One number trip circuit supervision relay VAX31 of approved make 4.1.3.0 2 Nos. Transformer (Outgoing) cubicle each comprising of: 4.1.3.1

1 No. 3 Pole 12 KV 630 A Vacuum Circuit Breaker complete with rupturing capacity of 25 kA at 12 kV with the following: 3 Nos. Metal Oxide Surge Arrestors with 5KA discharge current with suitable mounting bracket and earth connection.

4.1.3.2 Epoxy resin cast current transformers as follows: a. 3 Nos. 15 VA, 5 P20 .100/50/5 Current Transformers for protection b. 3 Nos. 15 VA, Class 1, 100/50/5 Current Transformers for metering. 4.1.3.3 Relays as follows: a. 1 No. triple pole over current and earth fault relay with IDMT and instantaneous elements CDG 63 of approved make. b. One number tripping relay VAJH 13 of approved Make.

c. Two number Auxiliary relay VAA 23 of approved Make d. One number trip circuits supervision VAX 31 of approved Make 4.1.3.4 Meters as Follows: a. 1 No. 0-100/50 Amps Dual Range Ammeter, Class-1 with Selector Switch, 4.1.3.5 Cable termination facility for termination of 1 No 3 core 150sqmm 11 kV XLPE insulated UG cable with suitable gland plate

4.1.4.0 2 nos. of Outgoing feeder cubicle comprising of: Epoxy resin cast current transformers as follows: 3 Nos. 15 VA, 5P20,200/100/5-5A Current Transformers. For protection 3 Nos. 15 VA, Class -1 200/100/5-5A Current transformer for metering. 3 Nos. Metal Oxide Surge Arrestors with 5KA discharge current with suitable mounting bracket and earth connection 4.1.4.1 Relays and meters follows: a. 1 No. triple pole over current and earth fault relay with IDMT and instantaneous elements type CDG 63 of approved make b. One number tripping relay VAJH 13 of approved make c. 1 No. Auxiliary Relay Type VAA 23 of approved make. d. One number trip circuit supervision VAX 31 of approved make e. 1 No. Electronic Trivector Meter ER-300 N of with suitable software and optional cable for downloading data, suitable for 110 Volts AC supply from PT-one No on each feeder.

4.1.5

Annunciation Scheme a. 1 No. common Hooter suitable for 48V DC operation placed in buscoupler panel. b. Total 25 Window Alarm Annunciator with built-in Alarm Test, Accept and Reset Push Buttons to coverall incomer,outgoing panels and transformer c. Individual Electronic Timer (6-60 Seconds) (48 Volts DC Auxiliary) with 2 NO+2 NC SR Contacts to cut off the hooter after a preset time.

d. The common alarm will be initiated when any one feeder trips the hooter

& will cut off after a preset time or after acceptance. The alarm initiated lamp will be glowing until the respective relays are reset. Alarm shall come again if another fault appears before the alarm re-setting relay of reset.

4.1.6

Power and control cable termination facilities (including control cable glands and. lugs, but excluding 11 kV cable glands, termination/jointing kits) as specified/required in all panels.

4.1.7

All other devices and materials required to meet the functional requirements and specification including auxiliary relays.

4.2

4.3

All materials and equipment shall conform to latest IS specification. Where specification IS don’t exist, the relevant BS/IEC specifications shall be applicable. The switchgear shall confirm to the latest editions of the following standards i. IEC 62271

High Voltage Alternating Current Circuit Breakers.

ii. IEC 298

A.C metal enclosed switchgear and control gear for rated voltages above 1 kV and up to and including 72.5 kV.

iii. IS 13118

High Voltage Alternating Current Circuit Breakers

iv IS 13516

Method of synthetic testing of High Voltage Alternating current circuit breakers Range 1000-11000 V tests.

v. IS 2705

Current Transformers.

vi. IS 3156

Voltage Transformers.

vii. IS 375

Marking and arrangements for Switchgear bus bars.

viii. IS 2208

HRC fuse links.

ix. IS 3231

Protective Relays

x. IS 694

FRLS PVC Insulated cables.

xi. IS 1248

Electrical indicating instruments.

xii. IEC-67/CBIP 88

Electronic Trivector meter

Switch board Ratings:

4.3.1 Complete Switchgear: The following specifications shall apply for the complete switchboard assembly, including CBs Bus bars, bus taps, instrument transformers etc., Service Voltage : Highest system Voltage : Rated Frequency : Standard impulse withstand Voltage One minute power frequency Withstand voltage : g) Rated RMS short time current For one second (Symmetrical) h) Rated Continuous current of Busbars . i) Type of Switchgear type.

11 kV 12 kV 50 Hz 75 KV 28 kV : 25 kA : 630A Horizontal Isolation and Horizontal Draw out

4.3.2 a. b. c. d. e. f. g h I J

Circuit Breakers (Interrupter s) Symmetrical Interrupting Capacity at rated Voltage Asymmetrical Interrupting Capacity at rated Voltage Rated peak current Rated short time current Rated continuous current Inside the cubicle Operating duty Breaking time Closing time Operations Auxiliary contacts

: 25 KA : 1.25 Times rated of Symmetrical Interrupting Capacity : 2.55 Times rated of Symmetrical Interrupting Capacity : 25 kA (3 Sees) : 630 Amps. : O-3Min-CO-3 Min-CO : 4 to 6 cycles maximum : 5 to 8 cycles maximum : Electrical (Manual also) : 4 Amps at 110 V DC, 2 Amps at 240 V AC and adequate for operational needs.

A Graph indicating Current Vs Number of Operations shall be submitted along with the offer. Range of the Currents shall cover from Load Current to fault current. 4.4 Technical Requirements and Constructional Features: 4.4.1

safety Features and Interlocks: Provision shall be made for automatic closing for lockable metallic shutters to prevent accidental contact with main stationary contacts or other live parts, when the breaker is drawn out When the breaker is inserted back into its cubicle, it shall automatically raise the shutters allowing the breaker to continue its travel unit it finally engages the main stationary contacts. Mechanical and electrical (Wherever feasible) Interlocks shall be provided for the following functions: a. Prevent the circuit breaker being moved to or from its position (Service, Test/Isolated ) when it is in the closed position or/ and the breaker compartment door is open. b. Prevent Circuit Breakers being operated except in the following positions. I. Service position (the Primary disconnecting devices are fully closed /latched in). II Test/Isolated position. c. Prevent manual closing of the breaker unless it is in the Test/Isolated' position. Provision must be made to defeat the interlock in emergencies. d. Electrical closing (Local) is possible only when the breaker is in Service or Test/Isolated position. e. Electrical closing (Remote) is possible only when the breaker is in Service position. f. Breaker compartment door can be opened only when the breaker is in 'Test/Isolated' position, other wise the breaker shall be tripped by suitable means. f. Breaker can be closed only when the breaker compartment door is closed properly. This shall be achieved by using suitable limit switches for the door assembly. g. Incomer and bus coupler feeders shall be interlocked to ensure that any two of the three can only be closed/remain closed at a time.

4.4.2

Switchboard - Construction:The switchboard shall be totally of enclosed design dust and vermin proof. It shall comprise of rigid welded structural frame enclosed completely by metal sheet of 2.5mm thick for load bearing members and 2.2mm thick for non-load bearing

members. Suitable gaskets between all adjacent units and beneath all covers shall be to render the joints effectively dust proof. The gaskets shall be chemically treated neoprene. The switchboard (enclosure) will confirm to minimum IP4X. The switchboard will be made up of cubicle panels which shall be suitable for easy extension on both the sides by addition of similar panels. Structures, buses and control wiring troughs shall be so designed and arranged as to make future extensions readily feasible. All similar materials and removable parts of identical equipment shall be interchangeable with each other. The switch board shall be complete with internal wiring -and interconnection between the cubicles. Each cubicle panel shall be of draw out, metal enclosed type. All . cubicles will have the same width, height and depth. Width of each cubicle looking from the front door shall not exceed 800 mm and also the height of the cubicle panel shall not exceed 2100 mm to suit the space available. Suitable guides, slides/rollers and stops for proper positioning of the truck or carriage with the breaker shall be provided to ensure easy removal, replacement and positioning of the breaker. Each cubicle/panel will be divided into the following compartments: a. b. c. d. e.

Bus Bar Chamber Current Transformer Chamber. Cable Chamber Circuit Breaker Chamber Meter and Relay Chamber

Meter & Relay, and circuit breaker chambers shall be accessible by means of hinges door other shall be accessible for maintenance and inspection through easily removable panels provided on each switchgear cubicle. Welded Wire Mesh with Caution Board (Skulls Mark) shall be provided in addition to the removable panels on the rear of the switchgear for CT Chambers and Power Cable Termination Chamber. All Instruments, relays and meters are to be mounted on the meter and relay chambers on the respective panels (or adjacent dummy cubicles). Main protective relays shall be mounted in the front and auxiliary relays may be mounted at the rear of the cubicle. All relays shall be of draw out type. All meters and relays shall be identified by engraved labels. Potential Transformers can be mounted in a separate enclosure on top -of the cubicle panel, alternatively, potential transformers shall be mounted on the moving carriage of incomer breakers and connected on incoming side. Or it can be a separated in a compartment at the bottom of the panel. Accidental access to the chambers carrying HV line parts will be prevented by proper barriers and caution boards. Vent openings shall be covered with grills so arranged that hot gasses or other material cannot be discharged through them in a manner that can injure the operators. A hinged door preferably with windows to see the carriage position and cut outs (with shutters) for access for manual operation of circuit breaker to be provided for the circuit breaker compartment.

It shall be possible to close the hinged door with the circuit breaker in the fully draw out (isolated)position. The sheet steel used in the fabrication of the switchgear housing, shall be cold rolled, of thickness specified elsewhere in this specification and leveled and finished smooth in such a manner that the complete structure shall be rigid, self supporting, free from magnetic vibration, twists and bends. All the steel panels enclosed in a switchgear unit, hinged doors, partitions and removable panels shall be reinforced against distortion by rolling, bending or with stiffeners to ensure freedom from sagging, bending and general distortions of panel or hinged parts and to minimize flexing and vibration. The removable panels shall be furnished with fasteners and shall be of such dimensions that can be easily handled by a workman. All compartment doors shall be so constructed that they will not seize in the event of fire within the switchgear. All switchgear components viz. circuit breakers, instrument transformers, wiring and terminal blocks shall be trivialized and fungus-proofed for use in hot and humid climate. Providing of ventilating louvers will be preferred in the doors, rear removable panels and in such other location, as may be necessary to obtain permissible temperature rises. The louvers in the doors and panels shall be of a meshed construction to prevent entry of vermin and large insects. Opening shall not be used between adjacent compartments, for ventilation purpose. The different materials, used in the making of switchgear units such as bus insulation, bus support, etc., shall not support combustion. The location of bolts, used for the mounting of equipment and connections, within each compartment, shall be such as to permit their replacement without removing the equipment in adjacent compartments. The switchboard will be complete with base frame, ready for installation. 5.0 5.1

Circuit Breakers: General: Circuit breakers shall consist of three separate identical single pole vacuum interrupters operating through a common shaft by the operating mechanism. Suitable sturdy phase segregation barriers / shrouds shall also be provided for the interrupting mechanism.

Locking devices shall be provided on each circuit breaker for securely. Locking it in the Isolated/Test Position. The metallic parts of the operating mechanism shall be made of corrosion resistant material. Bearings shall be provided with pressure type grease fittings. Bearing pins, bolts, nuts and similar fixing parts shall be adequately fitted with locking devices, to prevent loosening or displacement due to repeated operation of the breaker. 5.2

Circuit Breaker Truck/Carriage: The Circuit Breaker Truck shall have the following: Vacuum Interrupter Assembly with inter-Phase barriers. Spring Operating Mechanism, Motor Operating Mechanism The contact arms which make the connection between the fixed portion and the truck, both at the top and bottom shall be insulated with heat shrinkable sleeving /epoxy powder coating to prevent phase to phase flash over. In the fixed portion the fixed contacts shall be provided with epoxy resin moulded spouts. The number of components used in the spring operating mechanism shall be kept to

the minimum to achieve maximum reliability and ensure long life. The truck carrying the breaker shall be provided preferably with. swiveling wheels preferably to enable easy movement & tuning. Once the front of the truck enters it shall be guided properly with guide rails to achieve perfect alignment and easy insertion. 5.3

Interrupters: The contacts of the interrupter shall be designed in such a way that very low current chopping levels are achieved by using special alloy material e.g. Copper Chromium configured main contacts and shall have sufficient area so that there is no excessive temperature rise which may cause pitting or welding, during the course of normal breaker operation. The contacts shall be adjustable to allow for wear and shall be easily replaceable. The interrupter shall have very short contact travel to minimize the drive energy required and shall be suitable for transformer switching also.

5.4

Operation and Control: The Circuit Breakers shall be power operated, by a motor operated compressed spring charging mechanism. Spring operated mechanism shall be complete with motor, opening spring, closing spring and all necessary accessories to make the mechanism a complete operating unit. Each mechanism shall be so designed as to enable a continuous sequence of Circuit Breaker opening and closing operation to be obtained by the control switch as long as the power is available to the motor, and at least one opening and closing operation of the breaker, on failure of power supply to the motor. The operation of the Circuit. Breakers shall be independent of the motor which shall be used solely for compressing the closing spring. The rating of the motor shall be such that for fully charging the closing spring, the time taken is about 10 Seconds. Charging of the spring shall occur automatically, whenever it is partly discharged. The closing action of the Circuit Breaker shall charge the opening spring to keep it ready for tripping. Spring charging motors shall be suitable for operation from the 240. V AC supply. A limit switch will isolate the motor from AC supply (Positive and negative side) when the spring is full charged. The mechanisms shall be such that failure of any spring will not prevent tripping and will not cause tripping or closing. Only one closing operation of the Circuit Breaker mechanism shall result from each closing operation of a manually operated initiating control device, even though the breaker trips while the initiating control device is being held in the closed position. There shall be no pumping action of the breaker. The anti-pumping feature shall be achieved electrically through a anti pumping relay. The Circuit Breaker mechanism shall make one complete closing operation once the closing control switch has been operated, and the first device in the control scheme has responded, even though the control switch is released before the closing operation is complete, The closing coils and other auxiliary devices shall operate satisfactorily at all Voltages between 85% and 110% of the rated Voltage. The trip coils shall operate satisfactorily at all Voltages between 70% and 110% of the rated Voltage. When the Circuit Breaker is in the closed position, a closing operation of an initiating control device shall not result in further operation of the closing mechanism. All Circuit Breakers shall be electrically and mechanically trip free preferably in all positions. When the power is removed from the closing control circuit after or during an incompleted closing operation all electrically operated devices in the control circuit shall result automatically to the normal breaker "OPEN" position.

The auxiliary switches for Circuit Breaker shall have multi-store stage, electrically separate, reversible, rotary type contacts. The auxiliary switches shall be designed to be individually adjustable for early or late closing . The auxiliary switches shall be positively actuated by the breakers, etc., in the closing stroke and a positive action would be preferred to spring return, on the open /stroke. The wiring of the auxiliary switches to the terminal blocks shall be done through a plug and socket arrangement which would permit withdrawal of Circuit Breaker without necessitating the removal of wires at the terminal points. Mechanically operated targets to show the "Open" and "Closed" positions of the breakers shall be provided. Red and Green lamps shall also be provided to indicate breaker Closed and Open positions, A white lamp will be used to supervise the shunt trip circuit. Suitable series resistors shall be provided with the lamps so as to eliminate the possibility of short circuit of the DC supply in the event of fusing of lamps. The Circuit Breaker will have provision of manual closing and tripping also. Mechanical indications for service/test/isolated positions and for 'spring charged' shall be provided. 6.0

Main Bus and Tap Offs: Special care shall be taken in the design of the bus bar system to provide for thermal expansion and to minimize the chances of a bus fault. Bimetallic washers shall be provided wherever copper and aluminium surfaces mate. Supplier shall furnish drawings of the bus bars to illustrate the special features of design. Minimum bus bar rating will be 630 Amps (Continuous current). Barriers with through bushings will be preferable in the bus bar chambers between the switchgear cubicles to localize damage (should a bus fault occur) to one cubicle only. Alternatively arc taps may be provided at both ends of the switchboards to limit damage due to arcing. The temperature rise of bus bars and bus bar connections when carrying rated current at rated frequency shall be as per relevant IS. The Bus Bars and Tap-Offs shall be made of electrolytic grade ALUMINIUM / copper shall be insulated with Raychem sleeve for a service voltage of 12 kV (Test Voltage of 28 kV RMS for one minute.) . Joint between the bus bars and tap offs shall be of the bolted type and shall have their contact surfaces preferably tinned to ensure that initial contact pressure around the bolts will remain substantially same at all temperatures up to rated full load temperature. All joints on the bus bars shall be suitably insulated. Wherever joints are there it shall be covered with shround. Bus supports and bushings shall be of non hygroscopic non ageing glass reinforced polymer.

7.0

Voltage levels for Control and Protection: The following are the voltage rating of different systems: a. b. c. d.

Trip coil Close coil Protective relay Indication lamps

: ; : :

48 V DC 48 V DC 48 V DC 48 V DC

e. f.

Spring charging motor bus Heater

: :

240VAC 240VAC

240 Volts AC supply will be provided to the panel shall be under the scope of contract. Adequately rated independent DP MCBs (MCB isolator for trip bus) will be provided for these buses at a common point for receiving the power supplies. 8.0

Grounding System: A copper ground bus having a minimum section of 50mm x 6 mm shall be provided for each switchgear section, extending over the entire length of the switchgear, bolted to the frame work and suitably braced to withstand mechanical stresses corresponding to the momentary duty specified. Each ground bus shall be provided with two clamp type connector at either end for connections of 50 x 6 mm, to copper grounding conductors. All non-current carrying metallic parts of equipment within each switchgear cubicle shall be permanently grounded through the ground bus. All bus joints shall be tinned.

9.0

Meters and Relays: Ammeters and voltmeters shall be class 1, 144 mm Square taut band type with 240° Scale. These shall be flush mounted on the panel with only flanges projecting. Dials shall be white with black numerals and lettering. Parallax free dials shall be preferred. Relay shall have dust tight covers. Fault detecting relays shall be of the draw-out type. Relays shall preferably be of the flush or semi-flush mounting type. The following setting range will be provided for the relays. IDMT over current element IDMT earth fault element Instantaneous earth fault element High set O/C element Under Voltage Relay

50-200% 20-80% 10-40%

200-800%

50-90% (7equal steps) Tripping and annunciation relay will be hand reset type with flag indication.

10.0

Instrument transformers:

10.1

General: The Instrument transformers shall conform to the requirements of the latest editions of the relevant Indian Standards. The VA burdens specified have been estimated on the basis of the VA burden data of the indigenously available relays and meters. However, it shall be the responsibility of the supplier to ensure that the specified VA burdens are adequate for the relays and meters furnished by him. In case the specified VA burdens are inadequate, the supplier shall offer instrument transformers of adequate VA burden and this shall be clearly stated in the offer.

10.2

Current Transformers: The Current transformers shall be of the dry type and shall be capable of withstanding the thermal and mechanical stresses resulting from the maximum short circuit and momentary current ratings of the switchgear. Wherever Dual Rating specified, it shall be achieved by variable secondary trums and fixed primary. Current transformers shall have polarity marks indelibly marked on each transformers and at the lead terminations at the associated - terminal block.

Facility shall be provided for short circuiting and grounding the Current t transformer secondary at terminal blocks. All Current transformers shall be grounded through a spare terminal on the terminal block to facilitate checking of the insulation resistance without disturbing the Current transformer circuit wiring. Current transformer characteristics shall be such as to provide satisfactory performance for the burdens to be applied in the case of metering equipment over a range of 10-100% of rated current, and in the case of relay equipment for the maximum fault current for which the switch gear is designed. 10.3

Potential Transformers: Potential Transformers shall be of the dry type and shall be protection their primary and secondary sides by current limiting, non-deteriorating HRC fuses, with interrupting ratings corresponding to breaker rating. It shall be possible to replace a fuse safely, without having to de-energies the main bus bars. Potential transformer and fuse mounting shall be housed in a draw out type cubicle and shall be provided with primary and secondary disconnect switches. When the potential transformer compartment is closed, the primary and secondary disconnect switches shall engage their stationary contacts, and the circuit shall be complete. If the Potential Transformer is drawn out for maintenance the primary and secondary disconnects shall disengage and the transformer primary shall be grounded. Arcing on the primary disconnects shall be prevented by the secondary circuits being arranged to open before the primary disconnects are separated to a safe distance and properly grounded Arrangement shall be made to prevent direct access to the Potential Transformer primary fuse unless the primary disconnects are separated to a safe distance and properly grounded. Necessary circuitry required for automatic voltage change over scheme of VT is under the scope of the bidder.

11.0 Control and Instruments Switches: Control switches shall be of rotary type, having enclosed contact which are accessible by the removal of cover and shall be provided with properly designated escutcheon plates clearly marked to show the operating positions. Control switches shall have momentary contract, spring return to center, with modern type pistol grip handle. Instrument and selector switches shall have round, knurled, black handles. 12.0

Indication Lamp: The Lamps shall be of Cluster LED Type, Jumbo LED Modules, suitable for 48VDC Volts. The module shall be supplied with suitable adapter 22.5 mm dia. Size for the panel cut-out.

13.0

Wiring and Terminal Blocks; Wiring shall be carried out with 1100 V grade, FRLS PVC insulated wires comprising of multi strand conductors of the following minimum sizes: Power circuits 240 V AC : 2.5 sqmm. copper ii.

Control & Potential .circuits: 1.5 sqmm. copper iii. Current transformer circuits 2.5 sqmm. copper

Control wiring for different functions like trip circuits, alarm and indicating circuits, close circuits, etc., will be clearly distinguished by colour coding as approved by the EIC. Identification ferrules will not be considered adequate for this purpose. All auxiliary contacts whether spares or otherwise shall be wired and brought out to the terminal blocks. Current transformers secondary leads shall be brought on to the terminal blocks, where provision shall be available for short circuiting and grounding of Current transformer secondary. The wire terminals shall have engraved or otherwise indelibly marked ferrules for identification. Wires shall be provided with numbered ferrules at both ends and drawings shall bear the same numbers. Wiring between compartments within the switchgear Cubicles shall be done through terminal block only. Direct connection shall not be permitted. Provision shall be made to ground the potential transformer and Current transformer neutral terminals. All small wiring shall be run in conduit. Wiring between terminals of various devices shall be point to point. No wire splicing or T connections are permitted. Wires shall be neatly tucked along the back of the panels, adequately supported, to prevent sagging ,damage due to vibration in transit and operating. Wire terminations shall be made with compression type connecting terminals which firmly grip the conductor. Each terminal block shall be one piece molded, barrier type 650 V grade complete washers, heads, studs, with two nuts and shall have identification strips and adequate continuous current rating. Each terminal shall have only one wire terminated on it . For tapp, adjacent terminals with shorting strips shall used. At least 10% spare terminal blocks shall be marked and numbered by the supplier to show wiring designations. Wire identification marking strips shall correspond to the designations on the wiring diagrams. All wire terminals to the equipment shall also be marked with designate corresponding to those of the wire diagrams . Access to the control wiring and control switches shall be provided by of a hinged door panel. Adequate glands shall be provided for control cable entry, which shall be for the switchgear. Disconnecting switches shall be provided for connecting the control circuit between the Breaker unit and its housing. The disconnect shall automatically engage when the circuit breaker is placed in the operating position and shall be re-engaged manually, when the unit is in Position without using a test jumper. If the breaker unit has to be taken out for its maintenance and testing purposes, a test jumper shall be used to connect the control circuits between the breaker unit and its housing. The test jumper shall be supplied along with breaker. 14.0

Cable Termination Facilities and Supports:

Facilities for termination of specified cables will be provided, excluding glands, lugs and termination kits. Sufficient clearance must be provided between the terminals and gland plate to ensure required creepage path and convenient branching out of cores. Suitable Cable Entry Box, if required specified by the purchaser shall be supplied for fixing of the cable gland. The height of cable termination terminal not be less than 650 mm. Heat shrinkable termination kits are proposed for the HT cables. Suitable supports shall be provided in each switchgear cubicle for supporting the incoming and outgoing power and control cables. 15.0 Space Heaters: Switchgear enclosures shall be equipped with space heaters of adequate capacity to maintain the internal temperature above the dew point to prevent moisture condensation within the enclosure. The space heater shall be rated for 240 V, 1

phase, 50 c/s, AC supply. The space heaters shall be automatically controlled by differential thermostats and shall be controlled by a suitable HRC fuse and MCB.

16.0 Danger and Caution Boards: 3 Nos. enameled standard danger boards of size as approved by Engineer-In-Charge with warning letters in English, Hindi and Tamil along with skull mark shall be prominently mounted on Switchboard. Further the Caution label shall be provided on every front and rear door of the cubicle and on the front door of every truck carriage. 17.0

Cubicle and Equipment Designation: Designation of the various cubicles will be furnished at the time of approval of GA drawing. The designation used for relays, breakers, etc., are brief and preliminary. The full designation will be finalized at the time of drawing approval. The scheme for equipment designation proposed to be adopted is as follows: i.

An equipment designation.

ii.

Complete model or type number.

The above equipment designation shall be complied with in all drawings produced by the contractor. 18.0

Name Plates: Name Plates with cubicle Designation with approved letter of size (engraved on 3 layer Bakelite strip) shall be fixed both on the front and rear of each cubicle. Incomers, Bus Coupler and outgoing feeders shall have different coloured Name Plates. Inaddition to their the designation shall be written by paint. Each Circuit Breaker shall be provided with name plates which shall give the following data: a. b. c. d. e. f. g.

h. i. j. 19.0

Manufacturer. Manufacturer's type and designation and serial number. Year of Manufacture. Rated continuous current. Rated Voltage and maximum and minimum design voltage. Rated Frequency. Rated interrupting MVA Breaking current (KA) asymmetrical and symmetrical values. Weight of complete Circuit Breaker. Closing Coil and Tripping Coil Voltage range.

Name plates shall also be provided for the following; a. b. c.

Current transformers giving the data as per the latest edition of IS:2705 Potential Transformers giving the data as per the latest edition of IS:3156 Relay-to denote function and phase.

d.

Fuses- to denote function and phase.

20. Painting and Finish: All interiors and exteriors of switchgear/transformers/enclosures/tanks/breaker mechanisms, etc., shall be finished and painted to produce a neat, fire resistant and durable surface which would prevent rusting and corrosion. Sheet metal components shall be pre-treated using the seven phosphating process consisting of de-greasing, acid pickling, de-rusting, phosphating and passivation including repeated rising in between. On completion of passivation of the components they shall be preheated and then epoxy powder coated with Siemns grey RAL 7032 shade. Thickness of painting shall be minimum 75-80 microns. A mimic diagram shall be neatly painted using suitable fluorescent paint. 21.0 Documents to be submitted along with the Offer: The following Documents shall be submitted with the Tender: The 11KV switchgear offered should be a type tested product in line with standard and technical specifications. The tenderer shall furnish the following type tests reports along with General arrangement drawing, rating diagram plate and internal constructional details while submitting the offer 22

Type Test Reports: a.

Short Circuit withstand Test in accordance with IEC 56 /62271 & IEC 298/694 on main bus - vertical rises. Short Circuit making and breaking Capacity Test in accordance with IEC 56 /62271& IS 13118: Lighting Impulse Voltage withstand Test Temperature rise test.

b. c. d. 23.0 Drawings: a. b. c. d. e.

Dimensioned layout drawing of switch gear installation. Minimum front and rear clearances shall be indicated. General arrangement of breaker, isolators, Current transformers, Potential Transformers, bus bars, cable boxes, etc., in each panel (adequate number of cross sections should shown). Single Line Diagram of the switchgear. Dimensioned drawing of cable boxes showing the method of terminating the incoming cables. Details of Vacuum interrupter.

The Contractor shall submit within 2 weeks from the date of issue of work Order, for Engineer-ln-Charge 's approval, three (3) sets of drawings which shall include but not be limited to the following: a. b. c. d. e. f.

Complete assembly drawings of the switchgear showing plan, elevation and typical section views, and location of terminal blocks for external wiring connections. Foundation plan showing location of channel sills, foundation bolts and anchor bolts and anchors, floor pains and openings. Complete Wiring diagrams including terminal wiring designations. Schematic control diagrams (elementary), both AC and DC for breaker control, interlocks, relays instruments and space heaters. Structural drawings to show exact location and size of terminals for power cable connections.. Marked erection prints for approval.

24.0 Inspection and Testing: 24.1 The Engineer-ln-Charge or his representative shall at all times have reasonable access to those parts of the Contractor or sub-contractor's works concerned with the Manufacturer of the switchgear, for the purpose of witnessing tests and ascertaining that the material being supplied conforms to the requirements of this specification. On receipt of the Work Order, the Contractor shall furnish to the Engineer-ln-Charge, a detailed Schedule of Manufacturer & Delivery and Quality Assurance Plan to enable Engineer - In-Charge to plan visits to the Manufacturer's works for inspection during different stages of Manufacturer. Contractor shall indicate routine tests. All routine tests mentioned in the relevant Indian and IEC Standards shall be conducted by the Manufacturer at his works in the presence of Engineer-in-Charge or his authorized representative. The supplier shall perform necessary tests to ensure that the equipment and workmanship are in accordance with the stipulations of the specification. The following tests whether included in the manufacturer's routine tests or not, shall be carried out on each breaker: 24.2 Complete Switchgear Assembly. i. Dimensional checks. ii. Physical verification of components iii. Insulation resistance measurements of power and control circuits. iv. One minute power frequency withstand insulation test v. The current and potential transformer cubicles shall be left connected for tests. vi. HV Test (12 kV) on bus insulation. vii. Insulation tests, 2 kV for one minute, for all small control instrument wiring upto and including 250 Volts. viii. Interchangeability of removable elements viz., Circuit Breakers, etc., ix. Mechanical operation of Circuit Breakers, auxiliary switches manual devices, etc x. Functional test including sequence of operation. xi. Functional test on PT Change over scheme and power pack change over scheme. Xii Calibration of meters and relays. This may be done prior to assembly. xiii. Continuity and polarity tests on all coils and circuits. xiv. Functional test on all relays. xv. Functional tests or interlocks and operation of break different carriage and selector/ control switch positions. 24.3

Circuit Breakers: i. Resistance measurement of the operating coils on breaker. ii. Minimum control Voltage at which each breaker will operate successfully. iii. Operational/functional checks as following: 1. Closing of breaker when the voltage at the terminals of the closing device is within 85% to 110% of the rated auxiliary supply Voltage. 2. Tripping of breaker (Not carrying load current) when the auxiliary supply voltage is between 70% to 110% of the rated value. 3. Manual closing and tripping of breaker.

4. Closing with the trip coil energized 5. Tripping with the closing coil energized. 6 Latching and complete closing from a momentary operation of the control switch. 7. Test for simultaneous closing of 3 poles. 8.Test for closing and opening time at normal control voltage as also upper and lower control voltage range; preferably along-plotting of curve in unit of contact close/open cycles having the following points marked therein: Trip coil energized Arcing contacts part. Breaker in fully open position Closing coil energized. Arcing contacts touch. Breakers fully closed.

24.3

The speed of the breaker contacts at various stages of the closing and opening operation may be computed and furnished with the speed curve. 9. Milli volt drop test shall be made across the breaker contacts and between terminals. Test on Current transformers and potential transformers: a. b. c.

Ratio Polarity Calibration

25.0 Documents to be furnished along with Dispatch of Equipment: 25.1

Test Certificates: Contractor shall furnish material specification certificate for switchgear components, viz., Vacuum Interrupter, Motors, etc., and he shall be in a position to co-relate these certificates with the actual material used for these components. Four sets of following test certificates will be furnished at the time of delivery of Switchboard.. i.

Test certificates for all tests witnessed and attested by the Purchaser's Engineer.

ii.

Test certificates for all bought out equipment.

a)

Test certificates for all in house tests on switchboard and components.

25.2 Instruction Manual: Contractor shall furnish Four (4) copies (bound volumes) of instruction manuals covering installation, operation and maintenance of the switchgear. One copy of the above instruction manual shall be shipped with each switchgear. Details of mounted device such as CT, PT, Relays, Instruments, etc., shall be part of the document. Four (4) complete sets of approved as built final drawings (properly bound) shall be dispatched along with the switchboard. In addition to the above Soft Copies of Drawings prepared in Autocad R14 Version shall be submitted in CDs for the Purchaser's reference and records. 26.0 Installation, Testing and Commissioning: An undertaking for deputing their Engineers for final checkup and commissioning shall be provided by the manufacturer and the same shall accompany the offer. The Sub-Station building is already built and is readily available for the unloading of the equipment. The Contractor shall install the switchgear on the steel supports across the cable trenches as specified by the manufacturer and the Engineer-inCharge to achieve reliable service and performance. The rate quoted for erection of the switchgear shall include the cost of. chipping of

concrete floor, and supply and grouting of foundation bolts, etc., as required, concreting& plastering to make good the surface, leveling and aligning of the foundation channels, assembly of the entire. Switchgear, inter-panel wiring, etc., required for the completion of the work and energisation of the switchgear Leveling of the foundation channels. The manufacturer shall depute his Engineers and check whether the installation has been carried out properly and also to ensure that the inter-panel wiring has been carried out correctly. On completion of installation, the following Tests/Checks shall be carried out in the presence of the Engineer-In-Charge or his authorized representative and the Test Result shall be recorded and tabulated as directed by Engineer-In-Charge . 4 Copies of all the test Results shall be handed over to the Engineer - In - Charge in bound volumes, a. Insulation resistance Test on Switchgear before and after HV test. b. DC Hypot Test on Bus Bar and Switchgear. c. Checking the correctness of Bus Wiring. d. Checks on Instrument Transformers.. e. Calibration of Indicating Instruments. f. Calibration and Checks on TVM. g. Calibration of Relays/Secondary injection test. h. IR Tests on Control wiring. i. Primary Injection Test . j. Functional Test on Relays. k. Functional Checks on Alarm/ Annunciation Scheme. 1. Functional and Interlock Checks on Breaker m. Interlock Check between Feeders.

27.0 Format for submission of TECHNICAL DATA after award of work 27.1

11KV Metal Clad Switchgear with Vacuum Circuit Breaker.

1. Circuit Breakers: 1.1 General

:

Maker's Name

:

Manufacturer's Serial No

:

Standards applicable

:

Draw out or semi draw out type 1.2 Technical Particulars.

:

1.2.1 Type of Circuit Breaker & Model 1.2.2 Rated frequency 1.2.3 Rated Voltage 1.2.4 Maximum Voltage at which the Circuit Breaker can operate continuously(Max. Design Voltage) 1.2.5 Rated current within cubicle 1.2.6 De-rating factor for site conditions, if any: 1.2.7 Momentary current rating (RMS)A 1.2.8 Short time current rating(RMS): a) 3 Seconds b) 1 Seconds 1.2.9 Rated symmetrical interrupting capacity at: Rated Voltage

Maximum Design Voltage 1.2.10 Rated asymmetrical interrupting capacity at: a) Rated Voltage b) Maximum Design Voltage 1.2.11 Duty cycle for which the above ratings are applicable: 1.2.12 Insulation level of the breaker: b) One minute dry withstand test voltage(RMS) c) Impulse withstand test voltage IS) with 1.2/50 micro second: 1.2.13 Rate of rise of recovery Voltage at: a) 30% Breaking Capacity: 60% Breaking Capacity: 100% Breaking capacity: d) Max. rate of rise of recovery Voltage for which Circuit Breaker is designed. 1.2.14 Max. Over Voltage factor of Circuit Breaker when switching. a) Unloaded transformer

b) Loaded transformer 1.2.15 Making capacity peak value: 1.2.16 Latching current: 1.2.17 Ambient temperature on which the design of switchgear unit is based: a) Maximum: b) Average: 1.2.18 Maximum rise of temperature over the average ambient for continuous current rating at site conditions: 1.2.19 Short Circuit Test Certificate or Report No.: 1.2.20 Oscillogram No: 1.2.21 No. of breaks per pole: 1.2.22 Length of contact level: 1.2.23 Time rate of contact travel on tripping 1.2.24 Time rate of contact travel on closing: 1.2.25 Type of devices employed to secure uniform Voltage distribution between breaks: 1.2.26 Type of devices employed to limit the rate of rise of recovery Voltage: 1.2.27 Type of main contacts: 1.2.28 Material of main contacts: 1.2.29 Type of arcing contacts and/or arc control device: 1.2.30 Material of arcing contacts: 1.2.31 Whether contacts are silver plated. If yes, thickness of coating: 1.2.32 Contact pressure: 1.2.33 Minimum clearances provided (in air): a) Between Phases: b) Between Phases and earth: c) Center to Center distance between phases: 1.2.34

Minimum clearances provided (in gas) Between Phases: Between Phases and earth: Center to Center distance between phases:

1.2.35 1.2.36 1.2.36.1 1.2.36.2 1.2.36.3 1.2.36.4 1.2.36.5 1.2.36.6 1.2.36.7

Type and material of inter phase barriers: Interrupter Information (Electrical Data): Rated Frequency: Rated Maximum Line to Line Voltage: Rated Power Frequency withstand voltage: Rated Impulse withstand Voltage: Rated normal current: Contact Resistance at rated Normal Current Rated short circuit current:

1.2.36.8 Rated short circuit Breaking current % DC 1.2.36.9 Rated Short Circuit Making Current at required added force: 1.2.36.10 Rated duration of short circuit: 1.2.36.11 Rated capacitor switching current: Interrupter Informations (Technical data) 1.2.36.12 Interrupter Weight: 1.2.36.13 Moving Part Weight: 1.2.36.14 Contact Force from Atmospheric Pressure: Interrupter Information (Mechanical Requirement) 1.2.36.15 1.2.36.16 1.2.36.17 1.2.36.18 1.2.36.19 1.2.36.20

Contact Stroke: Opening Speed, average to 75% of Rated Stroke: Overall travel during opening; maximum L Closing speed, average of last 33% of rated Stroke: Contact Bounce Duration Opening Maximum: Added Force for short circuit making current: Interrupter information (Life) 1.2.36.21 Mechanical Life @ required contact Stroke: 1.2.36.22 Contact Erosion Limit: 1.2.37

1.2.37.1 1.2.37.2 1.2.37.3 1.2.37.4 1.2.37.5 1.2.37.6

Vacuum Interrupter pole details:

Degree of vacuum: Vacuum monitoring device: Vapour absorption media: ‘ Container material: Interior dimensions; Thickness of container:

a) Bottom: b) Cover: c) Side: 1.2.37.7 Max. vacuum to which container is designed: 1.2.38

Whether the circuit Breaker is designed to close the latch on Making or it is fitted with making current release: 1.2.39 Whether the Circuit Breaker is trip free: 1.2.40 Failure rate of Circuit Breaker: 1.3 Operational Features: 1.3.1: Method of closing: I) Normal ii) Type of closing mechanism 1.3.2 Normal Voltage of closing mechanism 1.3.3 Power at normal voltage of closing mechanism 1.3.4 Power at 80% of Normal Voltage 1.3.5 Type of tripping mechanism 1.3.6 Normal Voltage of tripping coils: 1.3.7 Power at normal Voltage for tripping coils: 1.3.8 Power at 50% of normal Voltage: 1.3.9 Spring Charging Motor details: a) Rating b) Voltage c) Current d) Speed

e) Class of Insulation f) Spring Charging time:

g) Maximum temperature rise h) Whether mechanical close/trip feature available: 1.3.10 Arc duration at 10% of interrupting capacity a) Arcing time (No. of loops & times) including resistor current duration: b) Resistor current duration: c) Total interrupting time, measured from the instant trip coil is energized to arc extinction of resistor current. d) Total length of arc. 1.3.11 Arc duration at 100% of interrupting capacity a) Arcing time (NO. of loop & times ) including resistor current duration. a) Arcing time (No. of loops & times) including resistor current duration: b) Resistor current duration: c) Total interrupting time, measured from the instant trip coil is energized to arc extinction of resistor current. d) Total length of arc. 1.3.12 Making time, measured from the instant of application of power to arcing contacts touching: 1.3.13 No of opening the circuit breaker is capable of performing, without inspection, reconditioning, replacement of contacts or other parts of mechanism etc. at a) b) c) d) c)

50% rated current 100% rated current 150% rated current Current corresponding to 50% of rated breaking capacity: Current corresponding to 100% of rated breaking capacity:

2. Switch Gear Cubicle: 2.1 Short time withstand rating of the switchgear (RMS) 1 Second 3 Seconds 2.2 Mechanical (momentary)withstand rating of the switchgear (Peak): 2.3 Design Voltage of the switchgear buses: 2.4 Clearances: a) Between Phases b) Between Phases and Earth 2.5 Withstand Voltages of complete Cubicle: a) Power frequency b)1.2/50 micro sec. impulse 2.6 Material and thickness of: a) b) c) d)

Front Panel Back Panel Panels between units End panels

2.7 Cubicle Dimensions of (Width X Depth X Height)mm a) Incomer breaker cubicle b) Transformer breaker cubicle c) Bus coupler cubicle.

d) PT cubicle if any: e) Dummy cubicle if any: i) Shipping dimensions of the largest package:

g) Overall dimensions of complete switchboard; 2.8 Weights (Kgs) of:

a) b) c) d) e) f) g) h)

Incomer breaker Cubicle: Transformer breaker cubicle: Buscoupler cubicle: PT cubicle if any: Dummy cubicle if any: Largest Shipping package Complete Switchboard: Circuit breaker truck:

2.9 Minimum and recommended clearances for the installation: a) In front of cubicles to permit draw out of switchgear truck: b) In front of cubicles with two switchgear rows facing each other: c) Behind Cubicle: 2.10 Impact loading for foundation design, to included dead load plus impact value of operating at max. interrupting rating in terms of equivalent dead load: 2.11 Method of circuit grounding: 2.12 Space Heater Details: a) Voltage:

b) Rating:

c) Numbers: d) Type of control: e) Whether thermostat control provided:

3. Bus Bars: 3.1 Rating of the switchgear buses: 3.2 Material 3.3 Bus insulation: a) Material and process: b) Thickness mm: c) Voltage grade: d) Test Voltage: 3.4 Details of bus bar segregation: 3.5 Maximum continuous current rating: 3.6 Momentary rating (Peak): 3.7 Thermal rating (RMS); a) 1 Second b) 3 Seconds 3.8 Temperature rise of the bus bars over the specified ambient for CMR: 3.9 Cross section of the bus bar: 3.10 One minute power frequency withstand voltage: 3.11 Impulse withstand 1.2/50 micro second wave: 3.12 Metal for the ground bus: 3.13 Cross section of ground bus: 3.14 Whether joints tinned or not:

4. Current Transformers: 4.1 List of Current transformer. BREAKER DESIGNATION

SIDE OF BREAKER LINE/BUS

CONTINEOUS PRIMARY CURRENT

RATIO

ACCURACY CLASS

Note: Furnish value of KPV, Rct &1mag at KPV also for class PS CTs.

BURDEN

4.2 Standards applicable: 4.3 Class of Insulation: 4.4 Continuous thermal rating (% of normal) 4.5Thermal rating (RMS) a) 1 Second b) 3 seconds

4.6 Temperature rise for 3 Sec rating: 4.7 Mechanical short time rating: 4.8 Characteristics(Quote attached drawings No): i) Protection Current transformers: a) Ratio & phase angle curve: b) Ratio correction factor curves for normal rated burden from 0.25 to 22 times normal primary current: ii) Metering Current Transformers: a) Ratio & Phase angle error curves: b) Magnetization curves: 4.9 Whether CTs are mounted on draw out truck or stationary cubicle; 5. Potential Transformers: 5.1 Type: 5.2 Ratio: 5.3 Frequency: 5.4 Accuracy class: 5.5 Class of insulation: 5.6 Rated primary voltage: 5.7 Rated secondary Voltage/phase: 5.8 Ratio and phase angle curves: 5.9 No. of phases: 5.10 Dry one minute withstand voltage: 5.11 Impulse withstand voltage: 6

Fuses: 6.1 H.V Side a) Type Make: b) Interrupting rating: c) Maximum short circuit current that can be interrupted. d) Characteristic curves Ref: 6.2 LV Side a) Rating of the fuse: b) Type and make: c) Descriptive pamphlet attached /not:

7. Bushings: 7.1 Type and make 7.2 Shipping dimensions and weight: 7.3 Bushing Insulation: a. One minute dry withstand: b. Ten minutes wet withstand c. Flash over Voltage: d. Impulse withstand voltage for 1.2/50 micro second full wave: e. Corona discharge Voltage: f. Nature of dielectric medium employed in the bushings: g. Volume of insulating medium per bushing: h. Creepage distance: 8. Disconnects: 8.1 Primary disconnects: a. Type:

b. Contact material: c. Whether self aligning or not: 8.2 Secondary disconnects: a. Type: b. Contact material: c. Whether self aligning or not: 9. Metering, Relaying & Miscellaneous Equipment:

MAKE

TYPE

RANGE

VOLT ACCURACY CASE SIZE SPECIAL P.F AMPS DELIVERY FEATURES IF ANY.

9.1 9.2 9.3 9.4 9.5

Ammeter Voltmeter Trivector meter Whether Ammeter and voltmeter are taut band type and 144 sqmm size.: MCB Current rating: a. MCB 1 b. MCB 2 c. MCB3 d. MCB4 9.6 Test links current rating: 9.7 Terminal blocks:

a. Type:

b. Current rating: 9.8 Auxiliary contacts: 9.9 Relays (Refer bill of materials): 10. Sizes of small wiring: a. Power circuits: b. Control circuits: c. CT circuits: 11. List of deviations: The contractor shall state all the deviations from tender specification in his offer, if any. The offer shall be deemed to be in conformity with tender specification unless deviation from tender specification are clearly mentioned in this section. 13. Proof of Ability: The Contractor shall furnish a list of Metal clad switchgear tendered to by him conforming to the specifications in this tender document and operating under similar conditions. 14. Delivery and Manufacturing Schedule: The Tenderer shall fill up the following schedule according to which the work shall be carried a. Period required for submitting drawing for Purchasers approval, from the date of issue of Purchase order: Weeks: b. Period allotted to the purchaser for approval of the submitted drawings: ____________________________Weeks. c. Period required to commence Manufacture on receipt of drawings approved by the Purchaser: ____________________________ _Weeks. d. Period required for completing the Manufacture of switchgear units: ____________________________ Weeks. e. Period required for testing the switchgear units: ______________________________ Weeks. f. Period required for the transportation of the tested units to site: Weeks.

Item No: 2 1.0 Supply installation and commissioning of float cum boost charger and batteries. SMPS module rating : 48V/25A Rack capacity

: 25A(1w+1s)

Technology

: High frequency switching (Pulse width modulation)

Charge rating

: 25A

No of SMR modules : 2 Battery rating

: 100Ah

Battery type

: MF-VRLA

Charging rate

: 10% C 10

Battery stand is included in the scope. GENERAL DESCRIPTION: The battery charger shall be designed to charge a 48V dc battery bank, providing accurate temperature compensated float and equalization voltage, low output noise and EMI levels, using 48V/25A switched mode rectifiers. The system shall comprise SMR rectifiers, depending on the power requirement of the system and control subsystem comprising monitoring and control module, a user interface board and mains monitoring board, AC input circuit breaker and battery input circuit breaker. The mains supply to the rectifier shall be fed through an MCB and the battery bank connected through MCB. The following functions shall be standard feature. 1. Temperature compensation of the battery float and equalization voltage. 2. Programmable battery charging current limit. 3. Automatic equalization of the battery with selectable start (based on voltage /current level) 2.0 TECHNICAL SPECIFICATION: 1.

Input

1.1

Voltage shall be 150 to 275V single phase Active. Neutral Earth 220 +25%32% V ac. Frequency shall be 45 to 65 Hz. Current shall be 7A rms at 220Vac. Power Factor shall be >0.99 at full load &>0.95 from 50% load and above. Efficiency shall be >90% typical from 50 to 100% load at nominal input voltage & >85% for other load conditions. Surge Protection shall be tested to ANSI C6241-1991. Cat B3 high system exposure. Combination wave 6kv/500A test. Dielectric test (Voltage Withstand test) shall be 1500V ac input to chassis & DC to earth for 1 minute. Start up Inrush Current shall be <8A peak at nom. Mains Voltage.

2.2 3.3 4.4 5.5 6.6 7.7

8.8

Soft Start Time shall be 10 secs. Min. output current ramp-up.

2.

Output

1.1 2.2 3.3 4.4 5.5

Voltage: Float Adjustable 48V to 58V, Equalize Adjustable 50V to 61V. Current limit shall be Adjustable from 5 to 27A. Conversion Frequency shall be>92KHZ. Static Regulation shall be line ±0.1% Load ±0.5%. Dynamic Regulation shall be line ±1% of final voltage from 10% to 90% to10% step load Change and ±1% for ±25% step change in AC input Voltage. Output noise shall be < 2mV RMS psophometric Weighting. 100mV peak to peak. Production shall be by means of Fuse at the output of SMR. On Over voltage, the unit shall shut down. The unit shall be able to sustain short circuit at output terminals indefinitely. On Over temperature, there shall be Gradual reduction of current limit, If heat sink temperature exceeds pre-set limit.

6.6 7.7 8.8 9.9 10.10 3.

Monitoring

1.1

Current shall be monitored on display. Accuracy ±1% of full load, bar-graph display on module. Voltage shall be system voltage displayed on CSU’s display. Accuracy ±0.5% at full load. Alarm shall be SMR normal, SMR alarm and SMR shutdown indicated on front panel of each module other alarms and Status Displayed on CSU.

2.2 3.3 4.

Remote Controls

1.1

Not applicable

5.

Environment

1.1 2.2

Cooling shall be Forced Cooling, switching of Fans shall be based on Heat sink temperature. Temperature: Operating range: 0 C to 55 C.

3.3

Humidity shall be 0 % to 90% non-condensing.

6.

Mechanical

1.1 2.2

(Module) Noise shall be <50dBA (A Weighed). Module Input, Output connection shall be Two Part Irreversible at rear side of the module. Color shall be Siemens Grey of RAL 7032.

3.3

connectors

Item No. 3

-

Supply, Installation, Testing and Commissioning of 415 Volts Switchboard: 1.0

General Technical Requirements - Equipment Description:

The switchboard shall be suitable for continuous operation at 415 Volts 50 Hz 3 phase at a rated current of 2000A All components shall be liberally sized for limiting the temperature rise well within the stipulated values in the relevant Standards. Temperature rise on bus bars shall be as per relevant Indian standards. Minimum level of insulation used shall be Class E. Insulating materials shall be non-hygroscopic and shall be unaffected by variations in ambient and operating temperatures (10 C to 95 ° C). Space heaters are not contemplated. The components and the assembled switch boards shall be capable of withstanding a fault level of 50 KA symmetrical at 415 Volts. Bill of Materials in brief is furnished below for the LT' Panel specified under this Tender. The Bill of Materials furnished below is only indicative but is not limited only to these items. All the components required to meet the intent of the specification and for the completeness of the system & satisfactory performance of the Switchboards shall be provided by the Contractor at no extra cost.

2.0 List of components:1)

b)

Transformer # 1 &2 incomer Breakers each comprising of : 1 No. electrically operated 2000 Amps Three Pole ACB MV Breaker - 1 with accessories specified as follows: 3 Nos. 2000-1000/5 Amps, 15 VA class I CTs.

c)

3 Nos. 2000-1000/5 Amps, 15 VA 5P10 CTs.

d)

4 Nos2000/1 Amps, Kpv= 400V at max excit current =0.01A, 10 ohm @ 75 deg C PS CTs.

e)

1 No. 0-500 V, VoltMeter with selector switch.

f)

1 No. 0-1000/2000/Amps Ammeter with Selector switch.

a)

g)

1 No. CDG11 Relay with 1 No. 15 VA,200/5A, 10P10 CT mounted on neutral to ground path for stand by earth fault protection.

h)

1 No. CDG63 Relay.

i)

1 No. CAG14 Relay.

j)

3 Nos Voltage indicating lamp

2

b)

Out going feeder breakers incorporated with its accessories as follows for each breaker Two nos breaker. 1 No. electrically operated 1600 Amps Three Pole ACB with microprocessor based release with accessories specified as below 3 Nos. 800-1600/5 Amps, 15 VA class I CTs.

c)

1 No. 0-500 V, Voltmeter with selector switch (Analog)

d)

1 No. 0-800/1600/Amps Ammeter with Selector switch (Analog).

e)

1 No. 3 Phase, 4 wire energy Meter (Digital)

3

2 nos 1250 A ACBs each comprising of

a) b)

1 No. Electrically operated 1250A Three Pole ACB with microprocessor based release with accessories as below 3 Nos. 1250/800/5A, 15 VA class I CTs.

c)

1 No. 0-500 V VoltMeter with selector switch (Analog).

d)

1 No. 0-800/1250Amps Ammeter with Selector switch (Analog)

e)

1 No. 3 Phase, 4 wire energy Meter (Digital)

4

2 nos 800 A ACBs each comprising of

a)

1 No. Electrically operated 800A Three Pole ACB with microprocessor based release with accessories as below

b)

3 Nos.400- 800/5A, 15 VA class I CTs.

c)

1 No. 0-500 V Voltmeter with selector switch (Analog).

d) e)

1 No. 0-400/800Amps Ammeter with Selector switch (Analog) 1 No. 3 Phase, 4 wire energy Meter (Digital)

5

4 nos. 630A TPN SFU each comprising of

a)

1 Nos. 630A TPN FSU each with 600A HRC Fuses

b)

1 No. 600/300/5 Amps 15VA class - I CT

c)

1 No. 0 - 600/300 Ammeter

a)

6

2 nos. 400A TPN SFU

a)

1 No. 400A TPN FSU with 400A HRC Fuse

b)

1 No. 400/200/5 Amps 15VA class - I CT

c)

1 No. 0 - 400/200 Ammeter

d)

1 No. 400A TPN FSU with 100A HRC Fuse

7

Bus Coupler Section

a) b)

1 No. Electrically operated 2000 Amp 4 pole ACB Bus coupler (MV Breaker - 2) fixed with mechanical castel inter - lock and with the following accessories. 3 Nos 1000-2000/5A, 15VA 10P10 CTs

c)

1 No. CDAG 51 Relay

Note:

Two incomer breaker and bus coupler breakers will have electrical and mechanical inter locking facilities so as only any two of the three breakers can be closed at any time.

Main Horizontal Bus Bar Rating shall be 2000 Amps. And Dropper Bus Bar rating shall be at various ratings as in SLD. Bus Bars shall be suitable for 415 volts, 3 Phase & Neutral. Bus Bars shall be insulated with heat shrinkable PVC Sleeves. Bus Bars shall be supported by suitable FRP/Cast Resin Insulators. Chromium coated bolts, nuts and washers shall be used for bus bar joints. Cable termination facilities for all outgoing feeders shall be suitable for various , sizes of XLPE/PVC armored cables including supply of aluminum lugs and heavy duty cable glands. Incoming to the panels from the transformer is through non segregated bus duct. 3.0

Standards

The Power Distribution Board as well as the equipment and components used shall comply with the latest amendments of the Indian Standards: Air Circuit Breaker IS 13947 part 2 Fuse Switch units and Rotary Power Switches IS 13947 part 3 Contactors IS 13947 part 4 Fuse fittings Fuses IS 13947 part 3, 1300 Rotary control switches IS 13947 part 3 Current Transformers IS 2705 Cubicle Protection IS 2147 Aluminium Bus Bars IS 5082 PVC Insulated Cable IS 694 Meters (Indicating Instruments) IS 1248 4.0

TECHNICAL DETAILS:-

4.1

Draw out Type Air Circuit Breakers:

The Draw out type Air Circuit Breakers shall comply with the requirements of IS: 13947 of the specification and shall also be certified for utilization category B duty regardless of whether incoming supply is connected to the top or bottom terminals.

The breaker shall be suitable for manual operation for closing and tripping and shall have microprocessor static trip release (except for I/C and B/C breakers) to provide highly flexible trip characteristic for perfect co-ordination. Provisions shall be available in the breaker for fitting accessories like shunt trip, Castle/ Ronnis interlocks covered front panel to prevent accidental access to live terminals. Knock out for fixing Castle / Ronnis interlocks and window for making settings on the static trip releases shall also be provided. The breaker shall have a robust trip free mechanism with mechanical ON/OFF indicators. The operating mechanism for manual closing for the breakers shall close the breaker at the correct speed independent of the operator. The ON/OFF indication of the breaker shall be achieved by a direct coupling. A positively driven auxiliary switch with 6 Nos. change over contact shall be provided in each breaker. Suitable arc chutes with sturdy mounting arrangement shall also be provided. 4.2 Technical data Rated voltage Rated insulation voltage Making capacity Short circuit breaker capacity At 415 V, 0.25 PF duty cycle Rated short time withstand current for 1 Sec. Electrical endurance No. of cycles

415Volts 660 Volts 120KAp 50kA RMS 50 K Amps RMS 500 Nos.

At rated voltage and rated current No of poles

3poles (B/C 4 poles)

4.3 Release to be provided in the Breaker: Each out going feeder breaker shall be provided with integrally mounted microprocessor based trip releases for short circuit/over current and earth fault. These releases shall be of self powered type, drawing current from the secondary of the Current transformer and shall have the following adjustments. Over current pickup

0.4 to 1 time of the transformer Chosen in steps of 0.1.

Tripping time

0.15 Sec. At times current rating (fixed) 2, 3,4,5,6,8,10 times current setting.

Short time delay pick up Short time delay Earth fault pick up Earth fault delay

: - :

Instantaneous ,0.05, 0.1, 0.2, 0.3 and 0.5 0.25 times the current setting. Variable settings • 0.2 sec

4.4 Fuse Switches: Fuse switches shall be rated for continuous operation at nominal current and rated maximum Voltage of 440 Volts. They will have an overload breaking capacity of 8 times the rated nominal current and a making capacity (0.35pf) of 6 times the rated

nominal current. They will be suitable for motor duty (AC 23 Category IS 4064). The moving bridge will carry the HRC fuses. The double break fuse switch unit will preferably have a withdraw able fuse carrier which will be driven by the operating mechanism. The operating mechanism will be mounted on panel door. The fuse switch unit will have an easily removable neutral link of adequate size to receive Aluminium Conductor Power Cable. The contacts will be silver plated copper. Moving contacts shall be self aligning type. It shall be possible to inspect, replace the contacts easily. Complete phase/phase and contacts/ contact segregation will be provided. The moulded insulation will have high temperature and arc withstand capacity. It should be possible to lock the switch in either position. Door interlock shall be provided to ensure that the cubicle door can be opened or the switch can be drawn out only the switch is in OFF position. Provision shall be available to defeat the interlock by a skilled technical in emergencies. It shall be possible to close the switch only when it is in the correct position and the door is closed Fuse switches will be complete with HRC fuses of ratings specified in the SLD. 4.5

Rotary Switches:-

Power switches up to and including 63 Amps and all control switches.(Ammeter and Voltmeter selector switches, etc.,) shall be rotary type. The switches will have self-aligning, silver plated, double break (air break) wiping contacts. Control switches will have pistol grip handles and will be flush mounted on the device panel. Power switches will be mounted inside the feeder compartment with lever type handle, opera table without opening the compartment door. Door interlock will be provided so that the cubicle door can be opened only when the switch is in OFF position. A neutral link will be provided along with all power switches. Locking arrangements shall be provided for all power and control switches except Ammeter and Voltmeter selector switches. All rotary switches will be provided with function and position engraved indicating plates. Ammeter selector switch will be 3 position and OFF type whereas Voltmeter selector switch will be 3 position and OFF.

4.6

Fuse fittings and fuse units:

Fuses for Switch fuse Units will preferably be mounted before the switch and shall be easily accessible. Fuse fittings shall be of non-hygroscopic and non-inflammable phenolic moulding. The fuse fitting shall be designed for high contact pressure. Fuse fitting will comprise of carrier and base, the base receiving the connection terminals and the easily removable bridge carrying the HRC fuse. The contact will be riveted properly and. aligned perfectly to avoid loose contacts and loose terminals. It shall be possible to visibly identify blown fuse without removing the carrier. Fuse fittings will be complete with HRC Fuses of ratings to be confirmed later. 4.7

Fuses

Fuse shall be of high rupturing capacity, low power loss, link or bolted type. The Non-deteriorating HRC fuse will have a minimum rupturing capacity of 80 kA RMS symmetrical at 440 Volts. The fuse will give clearly visible indication after operation. The fuse housing will be designed to withstand the stresses developed while breaking fault current. The fuses will have low cut off value. Normal ambient temperature variations shall not affect the characteristics of the fuses. Ratings of fuses for the various modules will be confirmed later during the drawing approval stage. 4.8

Contactor

Contactors shall be electro magnetically operated air break type. Contactors shall be suitable for AC3 duty at specified rating and coils shall be preferably epoxy encapsulated. The current rating specified will be for AC 3 duty. The contactors will be able to break and make 8 times the rated current. The double break Contactors shall be designed for bounce free operation with long life of 30,000 switching cycles. The Contractors will preferably be of silver alloy. De-ionisation chambers will be provided for Contactors rated 30A and above. Power and auxiliary contactors will be easily accessible for inspection, termination and replacement. Terminals will have self-rising washers for easy termination and replacement Auxiliary contactors will be dustproof. Separate terminal will be provided on power terminal for tapping control supply. Auxiliary contactors will have eight pairs of contacts with suitable combination of NO and NC pairs Auxiliary contactors will be rated for 6 amps and will have a making capacity of 60A and a breaking capacity of 40A at 500 Volts.

All power Contactors will have 2 NO and 2 NC auxiliary contacts rated for 10 Amps. All power and auxiliary Contactors will have epoxy cast plug-in type no volt coil suitable for 240V, 50 Hz, AC unless specified otherwise. Suitable mechanical built in visible indication to identify weather energized or not will be available on all power and auxiliary Contractors. Contactors will have provision for adding 'add on' auxiliary contact block and / or timer unit. Contactors will be chatter free with the core and armature specially alloyed /treated to avoid rusting. Contactors of all ratings will be of a single source/make. If the standard ratings adopted are not available, contactors of next higher rating will be used. 4.9

Indication lamps:

The lamps shall be of Cluster LED type, jumbo LED modules, suitable for 230 Volts, 50 Hz volts. The module shall be supplied with suitable adapter 22.5 mm dia sizes for the Panel Cut-Out. Power Consumption of the LED Lamps shall not exceed 2 Watts. The axial Light intensity shall be 100 milli candles. The Cluster LED shall have continuous over voltage capacity shall not be less than 300 Volts for 24 Hours. Each module shall be incorporated with the Low Voltage Glow Protection (LVGP) circuit to prevent glowing for Voltage not less than 25 Volts with a series fuse against accidental short circuit in the Module. Body of the Modules shall be preferably made of Dough Moulding Compound (DMC) and withstand the test of Fire Retardant Property under UL 94 V2. The Lens shall also be made of Fire Retardant materials such as Polycarbonate of high spectral transmission of a particular colour. The indication lamp shall be mounted flush on the door. 4.10

Current Transformers:

Current Transformers will be bar primary epoxy resin cast type. wound primary resin cast will be acceptable if bar primary is not feasible. Current transformers for metering will be of 15 VA with Class 1 accuracy. The current transformers shall be capable of withstanding the thermal and mechanical stresses resulting from the maximum short circuit and momentary current ratings of the switchgear. Current transformers shall have polarity marks indelibly marked on each transformer and at the lead terminations at the associated terminal block. Facility shall be. provided for short circuiting and grounding Current transformer secondary at terminal blocks. All Current transformers shall be grounded through a spare terminal on the terminal

block to facilitate checking of the insulation resistance without disturbing, the current transformer circuit wiring. Test links shall be provided in the CT secondary circuit in the phase. and neutral leads to carry out the current and phase angle measurement tests with the CTs in service.

4.11

Meters:

Meters shall be flush mounted on device panel. Meters will be of class 1.5 accuracy. Meters for all panels will be non Taut Band Type with 90° scale. Full load current of the equipment / feeder will be marked in RED in the instrument dial.

Meter size shall be maximum 144 mm x 144 mm and 96 mm minimum as specified in BOM for each Panel. Voltmeter will have range of 0-500 V. Ammeter ranges will be finalized while approving General Arrangement drawings. All Voltmeter Circuits shall HRC Fuse Protection in addition to 4 Pole MCB. Voltmeter Selector switch will be R-Y, Y-B, B-R, and OFF positions. Ammeter Selector Switch shall have R-Y-B and OFF 4.12

Cable Terminations:

The cable termination facility complete with crimping lugs and tinned brass single compression glands (Heavy Duty) to be supplied under the scope of this item will be suitable for the cable sizes indicated in the schematic diagrams. (Cable sizes indicated are tentative. Gland to terminal distance shall be 700 mm for 400 sq.mm cable. 500 mm for 240 sq. mm cable, 300 mm for 185 sqmm. cable and not less than 200 mm wide. It should be possible to terminate the cables from the front. In order to achieve effective Cable Gland Earthing, 2 mm thick copper sheet shall be fixed on to each Gland Plate for entry of Cables. The copper sheet shall be of same size as of Gland Plate and shall be connected to the horizontal earth bus using 8 SWG tinned copper wire. All the Gland Plates with Copper Sheet shall be suitably drilled for the Cable Sizes approved by the Engineer-in-Charge. Cable Glands and Crimping Type Aluminium/Copper Lugs as the case may be, shall are also to be supplied by the Contractor at no extra cost. Cables will enter from bottom and terminated directly at the outgoing fixed power/control contacts. All cable entries will be from the bottom. Bimetal washers shall be provided at copper to Aluminium junctions; Copper surfaces shall be tinned

at joints. Two numbers plain washers and a spring washer shall be provided at joints and cable terminations. The cables Glands shall be of Heavy Duty, tinned single Glands.

compression, Brass

All the terminal block mounted in the cable alley shall be provided with suitable FRP Terminal shrouds with suitable caution labels on it. 5.0

Constructional Details:-

The Power control centers shall be fully front access, made up of a number of identical vertical sections. Each section will be a freestanding cubicle made of 2mm thick sheet steel. A base frame made out of 75 x 40 mm ISMC shall be provided at the bottom with grouting holes and bolts. Preferred dimensions of each vertical section will be width 800mm, height 2300mm, depth 600mm. the enclosure shall conform to IP 52. The Power Control Centers shall be of single front type with all the components accessible for maintenance from the front. The TPN main bus bar will run horizontally in a separate chamber at the top and will be rated as per SLD. The vertical bus bars rated equal to the total of the feeders in that Section (with appropriate diversity factor) will run behind the feeder compartments preferably. Adequate access shall be ensured to the main and vertical bus bars. Bus bars will be braced adequately to withstand a fault of 50 kA symmetrical for one second. Spacing of the Vertical Bus Bar supports shall not exceed 600 mm. Accidental accesses to live parts/bus with the modules drawn out will be prevented. Bus bars will be PVC sleeved and joints shrouded. The current density adopted for the design of the Main/Dropper Bus Bars shall not exceed the following limits. Aluminium: 1 Amps/ Sqmm. The feeder compartments shall be modular in design. Each module will be of Fixed type. Each module shall be separately enclosed. Provision will be made available for padlocking the modules in ON and OFF position. The cable chamber shall be adjacent to the feeder compartments and shall be complete with tinned brass compression glands mounted in brackets and crimping type lugs for the specified cables. It should be possible to terminate the cables from the front. Cables will enter from bottom and terminated directly at the outgoing fixed power / co contracts. 2 mm thick copper sheets for the entire area of the,' plate shall be provided to achieve gland earthing. The gland plate be earthed with 8 SWG tinned copper conductors or 2.5Sq-mm flexible wire to the nearest Horizontal Earth Bus. The feeder compartments and the cable chambers shall be provided with hinged doors. Hinges shall be concealed type. . The rear door shall be bolted. All insulators and supports will be of non-hygroscopic material (Preferably of moulded fibre reinforced polyester) with adequate creepage distances. Support/barriers made out of phenolic resin bonded paper (Hylam) material are not acceptable. For motor starter units interlocks shall be provided to ensure that the starter door is not opened unless the switch is in the OFF position.

Control switches, indicating instruments, lamps and push button stations shall be preferably mounted on hinged device panel. Inter panel wiring shall be through a wire way at the top, running in front of the main bus bar chambers. 5.1 Feeder compartments will be arranged in such a way as to ensure the following: Height to operating know/handle is restricted within 2100 mm, but above 200 mm from floor level. Clear height available in the cable chamber is adequate to conveniently terminate the specified cables. The control terminals shall be located suitably with the approval of the Engineer- in charge and suitable glands shall also be provided for terminating the control cables. PVC Sleeves (short) shall be provided over the crimped lugs for all the terminations of the Power Wiring. The switchboards shall be of single front type with all the components accessible for maintenance/ replacement from the front. The switchgear shall be rated for 50 KA 1 sec. However, components downstream of protective HRC fuses in the modules need to be designed only for the magnitude and duration of fault current determined by the fuse. Compliance with this requirement shall be provide/supported by the design data. 6.0

Earthing:

A continuous run of 50 x 6 mm –copper earth bar (Electrolytic grade copper flat) for Horizontal Earth Bus and as well as Vertical Risers shall be provided in the Power Control Centre. Vertical earth bar will run along the feeder compartments. All modules doors shall be earthed with 2.5 sqmm PVC insulated standard flexible copper wire. All joints in the ground bus shall be tinned. All switch modules shall be earthed with 8 SWG Copper Wire at the rear suitable termination arrangement. 7.0 Power/Control Wiring and Terminal Blocks: Power wiring will be with 1100V grade PVC insulated Copper Conductor cables or copper/aluminium bars with 1100V grade PVC sleeving. Wiring for different functions shall be distinguished by colour coding as per relevant IS. The sizes of interconnection wires/links within the module of various ratings shall not be less than as specified below: For Switch Fuse Feeder , Size of the Wire 16sq mm copper PVC cable 150sq mm Aluminium flats 300sq mm Aluminium flats

Feeder rating Upto 63 A Above 63A to 200A Above 200A

Control wiring will be done with 1 1 0 0 V grade FRLS PVC insulated 2.5 sq.mm stranded copper conductor cables. All wiring will be terminated in shrouded terminals reaching into the cable chamber for direct connection of external aluminium conductor cable. Terminals will be bolted type. Power and Control terminal blocks for connection of Power and Control cables shall be suitably shrouded. All terminals will be identified with engraved identification plates defining the feeder and the function. All wiring will be identified with indelible ferrules at both ends. Auxiliary Contacts of all the Fuse switches shall be wired up to a Master Terminal Block fixed in a suitable location as approved by the purchaser. Terminal blocks for control wiring will be single piece moulded type with bolted terminals. 10% spare terminals for future use will be provided. Wiring shall be done neatly and bunched in such a way as to facilitate trenching. Control wiring will be segregated from power wiring and inter panel wiring will be through wire ways. All terminations will be crimped type. Tinned copper lugs will be provided for control wires. Aluminium lugs will be provided for terminating external aluminium conductor power cables. Wiring between terminals of various devices will be point to point. Splicing or T joints will not be permitted. 8.0

Surface Treatment and Finishing: All interiors and exteriors of switchgear/transformers/enclosures/tanks/breaker mechanisms, etc., shall be finished and painted to produce a neat, fire resistant and durable surface which would prevent rusting and corrosion. Sheet metal components shall be pre-treated using the seven phosphating process consisting of de-greasing, acid pickling, de-rusting, phosphating and passivation including repeated rising in between. On completion of passivation of the components they shall be preheated and then epoxy powder coated with Siemns grey RAL 7032 shade. Thickness of painting shall be minimum 75-80 microns.

9.0

Name plate and Legends:

Power Control Centre shall carry name plate carrying the following data: Manufacturer. Type, designation and serial number. Year of Manufacture Rated continuous current, Voltage and frequency Weight of complete panel. Insulation level Class of protection Panel designation will be displayed prominently in one or more locations. Shipping sections will be designated and identified clearly. Separate name Plate will be provided on each module(same as HT panel) furnishing the following. Feeder rating.

Feeder name Current transformer Ratio. 9.1 Danger Boards and Caution Boards: Power control center will have Standard danger board of appropriate size complete with system voltage, skull mark, etc., with letter in English, Tamil and Hindi. Caution Boards with appropriate warning shall be provided wherever required.

9.2 Documents to be submitted along with the offer:The following Documents shall be submitted with the Tender: GA Drawing Single Line Diagram Bill Of Quantities 9.3 Drawings: The Contractor shall submit within 2 weeks from the date of issue of Work Order, for Engineer- in - charge approval, four (4) sets of drawings which shall include but not to be limited to the following. a)Complete assembly drawings of LT switch gear showing Plan, Elevation and typical section views, and location of terminal blocks for external wiring connections. Minimum Front and Rear clearances shall be indicated. b) Foundation plan showing location of channel sills, foundation bolts and anchor bolts and anchors, floor plans and openings. c) General arrangement of Breaker, Isolators, Current Transformers, Potential Transformers, bus bars, cable boxes, etc., in each panel (adequate number of cross sections should shown)., d) Single Line Diagram of the LT Switchgear. e) Dimensioned drawing of cable boxes showing the method of terminating Purchaser's Incoming cables. f) Power and Control Wiring Diagram. 10.0 Inspection:The Manufacturer's works will be accessible for the Purchaser's representatives for stage inspections as and when required. Test schedule for the equipment will be finalized in consultation with the Purchaser and 5 days advance intimation will be given to enable the Purchaser's representative to witness the tests.

11.0 Tests and Test Certificates:11.1 Type tests: The 415KV switchgear cubicle offered should be a type tested product in line with standard and technical specifications. The tenderer shall furnish the type tests reports as per the relevant IS, along with General arrangement drawing, rating diagram plate and internal constructional details while submitting the offer.

11.2 Routine test:

The Tender shall indicate routine tests. All the routine tests specified as per relevant Standards will be conducted at Works in the presence of the Purchaser representative The following tests will be conducted in addition to / as part of routine tests at the works. • • • • • • • • 12.0

Dimensional Checks. Physical verification of components. Insulation resistance of power and control circuits. High Voltage test on power and control wiring - 2.5 KV for 1 minute on power circuit and 2 KV for 1 minute on control circuits with all meters, relays and instrument transformers in circuit. Functional test including sequence of operation. Calibration certificates of meters and relays Continuity, polarity and Ratio test on all CTs. Voltage change over scheme. Documents to be furnished along with Dispatch of Equipment:-

12.1 Test Certificates Contractor shall furnish material specification certificate for switchgear components, viz., Vacuum Interrupter, Motors, etc., and he shall be in a position to co-relate these certificates with the actual material used for these components. •

Four sets of following test certificates will be furnished at the time of delivery of equipments.

• • •

Test certificates for all tests witnessed and attested by the Engineer. Test certificates for all bought out equipment. Test Certificates for all in house tests on switchboard and components.

12.2 Instruction Manual:•

Contractor shall furnish Four (4) copies (bound volumes) of instruction manuals covering installation, operation and maintenance of the LT breaker. One copy of the above instruction manual shall be shipped with switchgear. Details of mounted device such as CT, PT Relays, Instruments, etc., shall be part of the document.

•

Four (4) complete sets of approved as built final drawings (Properly bound) shall be dispatched along with the switchboard.

•

In addition to the above Soft Copies of Drawings prepared in AutoCAD R14 Version shall be submitted in CDs for the Purchaser's reference and records.

13.0 Installation, Testing and Commissioning:-

An undertaking for deputing their Engineers for final check-up and commissioning shall be provided by the manufacturer and the same shall accompany the offer.The Buildings will be available at the time of delivery; however, the contractor shall arrange for safe custody and storage for the period. The manufacturer shall depute his Engineers and check whether the installation has been carried out properly and also to ensure that the inter-panel wiring has been carried out correctly. On Completion of installation, the following Tests/Checks shall be carried in the presence of the Engineer-in-charge or his authorized representative and the test result shall be recorded and tabulated as directed by Engineer in charge. 4 copies of all the test results shall be handed over to the Engineer in charge in bound volumes. HV Test Insulation resistance tests on Switchgear before and after HV test. Check on instrument Transformers. Calibration of indicating instruments Calibration of relays/ secondary injection test IR test on power and control circuit. Primary injection test. Functional test on relay. Functional checks on Alarm/Annunciation scheme. Functional and interlock checks on breaker. Voltage change over scheme.

Item no: 4.0 Specification for medium voltage bus duct Contents Technical specification 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 1.0

Scope. Capacity and quantity of bus duct required. Delivery and installation. Standards. Technical details. Surface treatment/painting. Earthing Measurements. Design data and drawings. Tests and Test Certificates. Deviations. scope The scope of work includes the Supply. Installation ,testing and commissioning of 415 V non segregated metal clad bus ducts.

2.0

capacity and quantity of bus duct required

2.1

The following Bus ducts are required. i) Rating :

2000 A , 415 V TPN Aluminium bus.

3.0 Installation Installation of bus ducts shall be done with proper angle support fixed to wall / ceiling along with suitable anchor fastener Installation procedures and support arrangements shall be finalised well in advance and got approved from the Engineer- in-charge. 4.0

standards The bus ducts shall comply with all currently applicable statutes, regulations, and safety codes in the locality where the equipment shall be installed. The equipment shall also conform to the latest revisions of all applicable standards.

i. ii. iii

IS 8623 IS 158 general IS 5578

5.0

technical details

5.1

Design particulars : i.

: Bus Bars & Bus bar connection. : Ready mixed water and heat resistant paint for purpose. : Guide for marking of insulated conductor.

Type of bus duct

:

Non segregated, Metal Enclosed, TPN

ii. iii. iv.

Type of cooling Installation location Normal Service voltage

: : :

v. vi.

: :

2000 Amps

: : : :

2.5 kV 50 KA. (rms) 105 KA peak. 900C.

xi.

Rated voltage class Continuous current rating of bus ducts Under site conditions Three minute power frequency Dry withstand voltage Rated short time current for one second Rated peak short time current Maximum operating temperature of bus bar for an ambient of 450C. Material of bus

Air, Natural Indoor 3Phase,415 V +/10%, 50 Hz, AC 1.1 KV

:

xii. xiii.

Mill volt drop across the joints Impulse with stand voltage

Aluminium Grade 63401 WP IS 5082 As per IS As per IS

vii. viii. ix. x.

5.2

: :

Construction requirements Bus duct shall be made as per site requirements for interconnection between transformer and Power Control Centre (PCC). Quantity of bus duct indicated in the schedule is approximate. Actual length of bus duct, number of bends etc shall be decided by taking actual measurements from site. GA drawing of the bus duct offered shall be submitted with bid specifying dimensions of enclosure and buses , clearance between phases and phase and earth etc., and it should match the Transformer and switch gear end termination facilities , the responsibilities of this lies with the bidder.

5.2.1

The bus duct shall be made of 2mm thick CRCA sheet. The bottom and side sheets shall be welded & top sheet shall be removable type with bolt & nuts 3 mm thick neoprene cork gasket shall be provided at bolted surfaces .

5.2.2

The length of the bus ducts section shall be as per the site limitations.

5.2.3

The bus ducts shall consist of :

i.

Straight runs.

ii.

Right angle bends.

iii.

End termination chambers, fire barriers, etc.

5.2.4

The bus bars shall be continuous and shall be of welded construction. All the welded joints shall be perfect without defects. The best welding method employing qualified welders shall be adopted. Welding at site, during installation shall be required. Busbar joints shall pass the mill volt drop test. Bus bars shall be painted with black insulated paint.

5.2.5.1 End termination chambers: In switchboard end termination, it shall be properly formed to match with the panel with flange. The busbar shall have tinned braided copper flexible links for connecting bus duct and Switchgear bus. Phase cross over if required will be indicated at transformer end termination chamber.

Transformer end termination shall be properly formed to match the LT side with flange and shall have tinned braided copper flexible links for connecting Transformer terminal and the bus duct. The busduct shall have flexible neoprene rubber bellow to take care of minor mis-alignments and expansion/contraction due to temperature variations. 5.2.5.2 Bolted flexible joints : Flexible braided copper connections shall be provided at both transformer and switchgear end terminal connections. Bimetallic connectors shall be provided between the busbar

and the copper flexible, the joints shall be

capable of 25 mm settlement of the equipment mounting pads. The joints shall be suitably designed to take care of the vibration at the terminals as well as the expansion and contraction of the busbars. Details of braided copper flexible links shall be got approved. Transposition of phases to match the equipment bus configuration also shall be accommodated at transformer end.

5.2.6

Hardwares All bolts, nuts and lock washers used in the bus assembly shall be of high tensile stain less steel, Spring washers of “Beleville” type or equivalent shall be used. Suitable splice plates and bimetallic connectors shall be provided wherever necessary.

5.2.7 Bus support insulators: Bus bars shall be individually supported by superior quality moulded Fibre Reinforced Polyester (FRP) insulators with adequate mechanical strength and liberal creepage distances. Bus bar supports shall be arranged at close intervals. The bus duct shall withstand the fault level specified. Bus bar supports shall be non-hygroscopic. FRP insulators supports shall be mounted suitably to take care of short circuit forces. Minimum thickness of FRP supports shall be 10 mm. As a consequence of current loading and variation in

external

temperatures in the external sections of the bus duct, condensation of moisture may take place on the surface of the insulators. Hence the insulated supports shall have a high creepage distance and a withstand voltage rating sufficient to provide specified insulation under highly humid condition. 5.2.8 Wall frame assembly The wall frame assembly shall be fabricated out of aluminium angles and sheet and shall be suitable for grouting in the wall. Fire barrier with fire insulation shall be placed along with wall frame assembly and shall prevent fire propagation from transformer room to switchgear room upto 3 hours

The electrical properties of the insulator shall be in conformity with the following specifications: i. Rated voltage

: 1.1 kV

ii. Three minute power frequency Withstand voltage

:3 kV (RMS) for both Dry & Wet

conditions iii. Minimum creepage distance

: As per IS 2099

iv. Material of insulators

: FRP with Fire insulation

5.2.9 Phase Clearances : The minimum phase to phase

and phase to earth clearances of

busbars within the enclosure shall be as follows : Phase to Phase

: 25.4 mm

Phase to Earth clearance

: 19.4 mm

5.2.10 Bus duct supports : i. Material : The supporting structure shall be fabricated from standard steel sections and shall be hot dip galvanised after fabrication. The hot dip galvanizing shall be in accordance with IS 2629 and IS 2633. ii. Accessories and hardware : The supporting structures shall include supporting members, brackets, hangers, longitudinal beams, channels, nuts, bolts, insulating pads, insulating washers and all other hard wares which are necessary for the erection and support of the entire bus duct installation. All the accessories and hard wares of ferrous material shall be hot dip galvanised. iii. Methods of support : Bus ducts shall be supported from the ceiling by anchor fasheners 4 per support / EPs if provided . 5.2.11 Markings : All components of the bus duct along with the supporting structures shall be distinctly marked for erection in accordance with the erection drawings to be prepared and furnished by the vendor. These marks shall be made in a manner as not to erased in transit or to damage the galvanizing of the bus duct or the supporting structure.

5.2.12 Miscellaneous : i. Studs, Nuts, bolts and tapped hoes shall conform to the relevant standards. Only hexagonal nuts shall be used. All bolt holes shall be spot faced for nuts. ii. Castings and forging shall conform to respective material specifications and

shall be free from flaws. They shall be machined true as per good

workshop practice. Welding shall be performed in accordance with relevant recognized standards. 5.2.13 Space heaters : The bus duct shall be provided with space heaters of adequate capacity to maintain the internal temperature above the dew point to prevent moisture condensation within the bud duct. The space heaters shall be rated for 240 Volts, single phase, 50 Hz, AC supply, the space heaters shall be automatically controlled by differential thermometers. Each bus duct shall have two space heaters, one number shall be fixed in side the bus duct in transformer room and another space heater in switchgear room. It shall be possible to replace the space heaters easily without dismantling the bus duct. 5.2.14 The bus ducts shall be designed to minimise the losses and the temperature rise due to induced currents. Provision shall be made for expansion and contraction of the bus duct due to temperature changes. 5.2.15 A fire retardant barrier with a fire rating of 3 hours, similar to the one of M/s. Lloyd Insulation design shall be provided. Test Certificate shall be enclosed with the offer. 5.2.16 The bus bar supports shall be easily accessible for inspection and maintenance. Cover shall be openable at top. The inspection covers shall be provided with quick acting stainless steel clamps and shall have gaskets. 5.2.17 Bimetal washers shall be used at end jointing to ensure proper electrical contact with the equipment terminals. Spring washers shall be used to maintain adequate contact pressure. 5.2.18 The bus ducts shall have a rectangular steel enclosure with adequate provision for supporting from ceiling E.Ps. The degree of protection shall be IP 55. 5.2.19 Three phase terminal enclosures shall be provided with flanged ends with drilling Dimensions to suit the flanges at equipment terminals. The flanges shall be provided with gaskets, nuts, bolts etc. 5.2.20 Drain plugs and Vents : Filter type drain plugs shall be installed at lowest elevation along the run of the bus duct to drain out automatically any moisture condensing with in the bus enclosure. The filter elements shall be easily removable for maintenance.

5.2.21 Mechanical Strength: The design of the bus duct enclosure shall be such that it shall withstand the internal or external pressures resulting from the following: a. Normal operating conditions b. Momentary short-circuit currents (peak) 6.0

Surface treatment/painting

All interiors and exteriors of switchgear/transformers/enclosures/tanks/breaker mechanisms, etc., shall be finished and painted to produce a neat, fire resistant and durable surface which would prevent rusting and corrosion. Sheet metal components shall be pre-treated using the seven phosphating process consisting of de-greasing, acid pickling, de-rusting, phosphating and passivation including repeated rising in between. On completion of passivation of the components they shall be preheated and then epoxy powder coated with Siemns grey RAL 7032 shade. Thickness of painting shall be minimum 75-80 microns 7.0

Earthing

7.1

A tinned copper earth bus of 50 x 6 mm shall run all along the bus duct, externally but supported on the enclosure. All supporting structures and bus duct shall be securely connected at two points to the earth station. All necessary hard ware such as clamps, connectors etc., required for this purpose shall be furnished by the vendor.

7.2

Technical specifications for copper ear thing flats Flats : The conductor shall be electrolytic grade copper. The same shall be tinned to a minimum coating thickness of 50 mills. ii. Applicable standards : IS 613 (latest revision)

8.0

Measurements

8.1

The length of the bus duct shall be measured along the centre line, from equipment flange at one end to the equipment flange at the other end.

8.2

Scope of installation includes making of cut outs on brick wall, grouting, welding to EPs embedded, fixing with anchor bolts and all associated works for the supporting structures including modification if required.

9.0

Design data of bus ducts

9.1

The bid shall contain design calculation in support of the following parameters of the bus duct design to submit along with bid i. Sizing of the bus bars vis-à-vis thermal capability to withstand rated continuous current and one second short time current. ii. The test report contains type test date, Name of Lab along with list of item.

9.2

After award of work the bidder shall submit following details, i. Spacing of the insulators vis-à-vis mechanical strength to withstand forces due to momentary short circuit current. ii. Heat loss and temperature rise calculations for conductor and enclosure.

iii The bid shall be complete with all heat loss calculations. All formulae and other information from which the heat losses have been derived shall be enlisted. iv Design of the bus duct shall have been type tested at CPRI or any other government recognized institute for the following tests : i.

Short time current test

ii

Temperature rise test for 2000 Amps rating.

iii

Impulse voltage tests.

iv

Power frequency voltage withstand test.

v

Degree of ingress protection for enclosure.

Copies of type test certificates for the above indicated tests shall be furnished after award of work. 10.

Drawings : The tenderer shall submit the following drawings along with offer: i. General Arrangement and sectional drawings showing the arrangement of bus bars, supports and enclosure dimensions with the offer. ii. Final dimensions and General Arrangement drawings, structural drawings and end

termination chamber details showing transposition of

conductors shall be got approved from the Purchaser before commencing manufacture. 11

Testing and test facilities

11.1

testing at manufacturer’s works: The following type and routine tests shall be conducted on representative section of the bus assembly as per IS8084. The bus assembly tested shall include bolted connections and flexible connections. The tests shall conducted as per standards indicated in this specification.

11.2

Routine tests i. One minute power frequency voltage withstand test. ii. Physical inspection and checking of clearances etc. as per drawing iii. Milli volt drop test for all joints iv. Insulation resistance checking

11.3

testing at site : Following pre-commissioning tests have to be conducted at site : i.

One minute power frequency voltage withstand test.

ii.

Physical Inspection and checking of clearances etc as per drawing,

iii.

Insulation resistance value measurement.

iv.

High voltage test with 2.5 kV for one minute.

iv.

Milli volt drop test for all joints.

Test report of pre-commissioning tests also shall be prepared and submitted to the department before commissioning the bus duct.

11.4 Test reports for components Manufacturer’s test certificates shall be submitted for tests conducted as per relevant standards for the following components. i. Insulators ii. Flexible joints. iii. Busbars

Item No 5.1 and 5.2 1. 0

a. 3C 150 Sq.mm. XLPE 11KV, (E) Aluminium conductor armoured cable. b. 3C 240 Sq.mm. XLPE 11KV, (E) Aluminium conductor armoured cable.

This scope covers Supply, laying, testing and commissioning of HT cable in the excavated trench / through hume pipes/over the cable tray/supports partly on the wall as the case may be. The cable shall be stranded compact circular aluminium conductor, conductor screened with extruded semi-conducting compound, XLPE insulated, insulation screened with extruded semi-conducting compound in combination with copper tape (0.3 KA for one sec.) cores laid up, inner sheath of PVC tape, galvanised steel flat strip armoured and over all PVC sheathed cable conforming to IS 7098/1985 with latest amendments. The cable shall be provided with adequate supports/clamps/ Slabs and identification PVC punched tags at selected locations. It is the responsibility of the contractor to make suitable arrangement for transport, loading, unloading, lifting and positioning of the cables in drums. All the cable drums shall be carefully transported and unloaded to the nearest locations of cable laying. Unwinding of the cable shall be carefully done, so that no undue axial pulling force is given to the cables. The trench of sufficient depth as required shall be excavated by the contractor along cable routing. HT cables shall be laid at a depth of 1 Metre and width of trench shall be as per Site condition. While excavating the trenches, precaution shall be taken to avoid damages for other services pipe lines, other cables laid already along the same route. Any obstruction like bushes and trees along the proposed cable routing shall be trimmed removed by the contractor at his own cost. Each run of cable will be cut of after actual measurement of route length at Site and after approval of the Site Engineer. Each cable run shall be identified at either end with suitable aluminium tags. Wherever cables are not pulled in pipes, buried in grounds, or laid in trays, they shall be clamped with 3 mm thick aluminium clamps of adequate width on 6 mm thick aluminium spacers at 600 mm to 750 mm intervals in the horizontal run and 700 mm to 1000 mm in the vertical run based on the size of the cable as directed by the Engineer — In- Charge at site. Spacers shall be grouted to wall with one or more screws and the clamps screwed to the spacers.

2.0 Laying: The scope of work shall include transporting the cable from place of storage to the laying location, laying the cable in the excavation trench, covering with river sand /table molded chamber bricks including supply of river sand, RCC slabs and testing and commissioning. Cables shall be laid using suitable roller and enough care shall be taken not to damage the cables, The cable shall be laid on the river sand bed, straightened and dressed neatly and covered on sides with standard table molded brick. River sand will be filled up on sides and top of the cable (75 mm all around the cable). Then cable shall be covered with standard brick. All the LT cables will have bricks on top & on sides(18 no. bricks per 1Rmtr). All bends and curves, bricks cut to shape will be used to avoid gap in the top cover. The cable shall be grouped and installed as directed. Cable identification tags shall be tied all along the cable at an interval of 100 m. and at every entry and exit points of Hume pipes. After the cables have been l ai d and before the trench is filled in, all joints cable positions should be carefully plotted.. The requisite protective covering shall then be "provided. The excavated soil shall be refilled and it is advisable to leave heap of earth not less then 50 mm in the centre and tapering towards the sides of the trench. Inspection: 15 days advance intimation shall be given to enable the purchaser's representatives to witness the routine tests. Tests and test certificate:. 3.0 Type test: The 11KV, XLPE cables offered should be a type tested product in line with standard and technical specifications. The tenderer shall furnish the type tests reports as per the relevant IS. 4.0 Routine test

All the routine tests specified in the relevant standards shall be conducted at works in the presence of the purchaser representative on all cables. Test certificates shall be submitted . After issue of shipping release the cables shall transported. Item No: 5.3 Excavation for cable laying in the soil The excavation of trenches shall be made in all types of soil including soft rock and hard rock and no extra cost shall be paid for cutting the trench in soft rock or hard soil. Backfilling and consolidating shall be done as directed by the engineer-in-charge. The Earth work shall consist of all works involved in site grading, excavation, sorting, filling around foundation, disposal of soil as directed by engineer-in-charge and other such relevant items. Excavation shall be done to lines and levels as directed by engineer-in-charge. The scope of excavation of trench shall also include cutting of bushes and trees in the route and protecting other existing properties if exposed.All excavation work shall be inspected and approved by the engineer-in-charge before any further works in excavated areas are allowed to commence. ITEM No: 6 End termination (Indoor) for 3 Core 11 kV cable 150 and 240 sqmm. End termination of cables shall mean the mechanical connection to the associated electrical equipment by means of sealing glands, gland earthing etc., connection of cables shall mean the connection of the conductor of the cable to the current carrying

portion of the associated electrical equipment to make the electrical system continuous. The high voltage power cables shall be terminated using Raychem make heat shrinkable termination kits and suitable crimping type lugs. The scope of work includes dressing the cable at the termination end, providing supports wherever necessary and terminating the cable. Gland plates shall not take the load. Gland holes shall be provided in the gland plates by using hole saw cutters or other approved methods. The unit rate quoted by the contractor for the supply, installation, termination and connection of cable shall include the cost of Al crimping type terminal lugs, cost of ferrules, glands, earthing with copper clips, cable identification tags and all other consumable items, required for the satisfactory completion of the job. Item No 7 Supply and installation of cable markers: The RCC route marker should be 750mm length, 400mm width And 60 mm thick. The marker shall be 400mm buried under earth. All the cables laid in ground shall be identified along the route of the cable by the cable route markers with inscription as instructed by the site Engineer. The cable markers shall be fixed at an interval of about 50 metres along the cable route and at cable route changing points. The cable route indicator sh all be yellow painted and lettering shall be black color.

Item No 8.0 1.0 Supply and laying of 1100V MV cables. The scope of the work covers Supply, Installation, testing and commissioning of cables as per schedule of approved make, XLPE /PVC insulated, PVC sheathed and Flat wire armoured power cable of 660/1100 Volts grade confirm to Relevant IS. The cable shall be laid partly in the prepared trench, partly through existing RCC hume pipe, partly on the cable tray/supports as required complete with clamping/dressing/brick protection, providing cable identification tag marks etc. Transportation and laying of Cables in Built - In Trench/ Brick Walls / RCC Structures, in Hume/GI Pipes etc., shall be carried out as directed. The Unit rate quoted shall be inclusive of cable identification tags made out of 75 x 25 mm Aluminium flat with letters of 6 mm size (min) punched, anodized after punching and all other consumable items (like supporting clamps, bolts nuts etc.), The Cable Tags shall be provided at either end of the cable near termination, Entry and exit points of hume pipes/ RCC structures/ GI pipes, and at every 100 Mtrs. inside the built-in trenches within the substation premises. Power cables: Aluminium/ Copper conductor XLPE/ PVC insulated, PVC inner sheathed, armoured , overall PVC sheathed 1100 volts grade cable conforming to relevant IS with upto date amendments. It is the responsibility of the contractor to make suitable arrangement for transport, loading, unloading,- lifting and positioning of the cables in drums. All the cable drums shall be carefully transported and unloaded to the nearest locations of cable laying. Unwinding of the cable shall be carefully done, so that no undue axial pulling force is given to the cables.

All HT power cable trench depth shall be 1000mm from ground level. In the excavated cable trench, river sand shall be filled up for 75 mm height. Before filling the river sand bed, the bottom of the trench should be carefully leveled and shall be free from stones, but if gradients and change of depth are unavoidable, they should be gradual. Medium voltage cables shall be lad in ground at a depth of 750mm form the normal ground level. The trench of sufficient depth as per drawing shall be excavated by the contractor along cable routing. While excavating the trenches, precaution shall be taken to avoid damages for other services pipe lines, other cables laid already along the same route. Any obstruction like bushes and trees along the proposed cable routing shall be trimmed and removed by the contractor at his own cost. Each run of the cable will be cut after actual measurement of route length at site and after approval of the site engineer. Each cable run shall be identified at either end with suitable aluminum tags. Wherever cables are not pulled in pipes, buried in grounds, or laid in trays, they shall be clamped with 3 mm thick aluminium clamps of adequate width on 6mm thick aluminium spacers at 600 mm to 750mm intervals in the horizontal run and 700mm to 1000 mm in the vertical run based on the size of the cables as directed by the engineer incharge at site. Spacers shall be grouted to wall one or more wood screws and the clamp screwed to the spacers. 2.0 Type test: The 1.1KV cables offered should be a type tested product in line with standard and technical specifications. The tenderer shall furnish the type tests reports as per the relevant IS. 3.0 Routine test

All the routine tests specified in the relevant standards shall be conducted at works in the presence of the purchaser representative on all cables. Test certificates shall be submitted . After issue of shipping release the cables shall transported. Item 9 1.0 End termination for LT Power Cable The medium voltage power cables shall be terminated by using "Siemens" type SIBG, Single compression tinned brass (Heavy Duty) Cable glands and suitable crimping type lugs. Supply of glands and lugs is also in the scope of termination work Aluminium lugs for aluminium cables and copper lugs for copper cables shall be used. The scope of work includes dressing the cable at the termination end, providing supports wherever necessary and terminating the cable. Gland plates shall not take the load. Gland holes shall be provided in the gland plates by using hole saw cutters or other approved methods. Glands shall be earthed with copper 8 SWG wire, and earth clips of size and thickness as approved by Engineer - In - Charge. All Materials required for completion of the work shall be in the scope of the Contract.

2.0 Type test: The 1.1KV cables offered should be a type tested product in line with standard and technical specifications. The tenderer shall furnish the type tests reports as per the relevant IS. 3.0 Routine test

All the routine tests specified in the relevant standards shall be conducted at works in the presence of the purchaser representative on all cables. Test certificates shall be submitted . After issue of shipping release the cables shall transported. Item No 10 Cable tray and supports 1.0 General: Steel sections covered in this specification shall be cold formed from steel structural members of thickness 2 mm conforming to IS 1079. For all the sections covered in this specification radius of 90° bend shall be 4 mm. All the steel sections after drilling and cold forming shall be hot dip galvanized. Sheet steels used for the fabrication of steel sections covered in this specification shall be of new. 2.0 Mechanical Components The cable trays shall be of nominal width 75, 150, 300, 450 mm and these shall comprise of the following components. The materials shall be supplied in strict accordance as per the item description. These cable trays shall be pre-fabricated and erected at site as detailed in the following clauses: 3.0 Ladder type cable tray Ladder type cable tray shall be prefabricated ladder type cable. 4.0 Perforated type cable tray Perforated type cable tray shall be prefabricated with flange height of 100 mm for 150mm width tray & 10mm for 75mm width tray and with standard lengths of 1 metre, 1.5 metres and 2.5 metres and thickness steel sheet shall be of 2 mm. At the base of perforated cable tray, 7x14 mm diameter holes are drilled at a distance of 25 mm from the edge with the spacing of 250 mm between holes. For the fixing of grounding conductor supports 9 mm diameter holes are drilled in the flange with the spacing of 500 mm between holes. In the flange height of 100 mm two number oblong holes of 7x14 mm diameter at each end are drilled for making connections with the adjacent perforated tray with the help of a connecting piece. On the top flange of 20 mm width, 7 mm diameter holes are drilled at the interval of 250 mm for fixing with the top cover plate. The oblong perforation of size 5 x 10 shall be used.

5.0 Cable tray supports 5.1 Support channel – The support fabrication Support shall be of 40 x40 x6mm ISA with various lengths. The support channel shall be welded to the Embedded Part (EP) on the wail in case of wall mounted cable trays and in case of ceiling / floor mounted cable trays, they shall be bolted to the support pieces and the support pieces shall be welded to the EPs on the ceiling / floor. 5.2 Connecting pieces The connecting pieces shall be of thickness 2.5 mm and the dimensional details for various connecting pieces such as straight, 90° bend and 135° bend shall be suitable for connecting the tray /bend. GI hardware shall be used. 5.3 Prefabricated Ladder type cable tray: 1. 2. 3. 4. 5. 6.

Material Thickness Standard nominal widths Rung spacing Cable tray height Standard lengths

: Cold formed hot dip galvanized steel : 2 mm : 300, 450mm : 250 mm : 100 mm : 1m, 1.5 m and 2.5 m

5.4 Prefabricated Perforated type cable tray: 1. 2. 3. 4.

Material Thickness Standard nominal widths Cable tray height

Cold formed hot dip galvanized steel 2 mm 150, 75 mm :

5. 6. 7. 8.

Type of perforation Perforation arrangement Size Hole spacing

Oblong holes: Staggered: 5x10 20 mm and 15 mm in X and Y direction respectively •

100 mm for 150mm width tray &10 mm for 75 width tray

lm 1.5 m and 2.5 m

9. Standard lengths 5.5 Connecting Piece:

1.Material 2.Thickness 3.Types of connecting piece

: 2.5 mm

4. Hardware

GI

Cold formed hot dip galvanized steel

: straight, 30°bend, 45°bend, 90° bend and 135° bend(Horizontal / vertical)

6. Cable tray accessories: 2.19.5.1

Horizontal Elbow:

Sl

Description

Ladder

Perforated

1,

Material

Cold formed hot dip galvanized steel

Cold formed hot dip galvanized steel

2.

Thickness

2 mm for Runner and 4 mm for

2 mm

7.0 Vertical Bend (Inside and outside ) SI. No 1 1.

Description

2.

Thickness

3

Bending angle

Material

Ladder

Perforated

Cold formed hot dip galvanized steel 2 mm for Runner and 4 mm for crosspiece 30°, 45°, 60° and 90deg

SI. 1.

Tee/Cross : Description Material

2.

Thickness

Ladder Cold formed hot dip galvanized steel 2 mm

Cold formed hot dip galvanized steel 2 mm 30°, 45°, 60°

90

Perforated Cold formed hot dip galvanized steel 2 mm

8.0 Cable tray reducer : SI.

Descripton

Ladder

1.

Material

2.

Thickness

2 mm

Cold formed hot dip galvanized steel 2 mm

3.

Types

450-300

150-75

Cold formed hot dip galvanized steel

Perforated Solid bottom

Hexagonal Head screw and nuts :

M6x 16N as per IS 1363

Punched washers

: A 6.6 as per IS 2016

Item no 11.1 supply, installation and testing of earth electrodes:Two Type of Earth Electrodes are to be supplied and installed by the Contractor as detailed below; a.

Plate Electrodes:

The Plate Electrode shall be of size 600 x 600 x 3 mm made out Electrolytic Grade Copper of purity not less than 99.5% and shall be tined by approved means. Bolts, Nuts and Washers- used in the Electrode Assembly shall be Stainless Steel Bolts shall be of 12 mm Dia., and Washers shall be of minimum 2 mm thickness. 2 Plate Washers and 1 No . spring Washers of thickness not less than 2 mm are to supplied for each set of bolt and nut. The GI pipe shall be supplied with a detachable galvanized( Thickness of galvanizing shall not be less than 75 microns) Cast Iron Funnel with Stainless steel Wire mesh, which can be screwed to the top of the Electrode. The Funnel shall be provided with a grub screw to prevent pilferage. The drawing for plate Electrode shall be submitted and got approved before taking up fabrication and effecting bulk supply. The construction assembly and dimensions of the plate Electrode shall be as detailed in IS:3043. 40mm dia heavy gauge GI pipe from plate electrode to ground level to be provided with holes. b.

Pipe Electrodes:

The Pipe Electrode shall be fabricated out of 40 NB, Heavy gauge Pipes and the construction assembly and dimensions of the pipe electrode shall be as detailed in 1S:3043. Required holes are to be drilled and the terminal plate shall also be welded prior to galvanizing of the Electrode by Hot Dip Method to ensure long life and to prevent rusting, etc. The terminal plates shall be provided with 4 Nos. holes for the connection of grounding conductor and shall be supplied with 4 Bolts, Nuts, 8 Nos. Plate washers and 4 Nos. spring Washers. Bolts shall be of 10mm Dia stainless steel made and Washers .shall be of minimum 2 mm thickness. 2 Nos. Plate and spring Washers shall be thickness not less man 2 mm are to supplied for each set of bolt and nut. The Electrode shall be supplied with a detachable galvanized Cast Iron Funnel/with Stainless Steel Wire Mesh| which can be screwed to the top of the Electrode. The funnel shall be provided with a grub screw prevent pilferage . Thickness of galvanizing shall not be less than 75 microns. 250mm long, 50 x 6mm tinned Copper Plate with suitable holes for fixing and Connection grounding conductors shall be fitted to the GI terminal plate provided on the top of the Pipe Electrode. The drawing for Pipe electrode shall submitted and got approved before taking up fabrication are effecting bulk supply. Scope of work includes supply and filling of tereck chemicals 10 Kg for each pit. Erection of earth electrode, soil treatment with tereck chemicals, refilling, providing of Brick Chamber or RCC hume pipe of 600mm Dia and 450 mm Height —RCC slab cover shall be provided as per drawing and as directed by Engineer - In charge. 40mm dia GI Pipe Sleeves to be provided in the Brick Chamber for entry of copper conductor from the adjacent earth pit and near by distribution equipmentk, the pipe shall be of Medium Gauge. The RCC Cover Slab shall be engraved with the marking "Earth Pit" Excavation of earth is included in the scope of this item and will not be measured separately. The unit rate quoted shall include the cost of excavation in all types of soil including & Hard rocks, brick filling of soil by layers and consolidation by watering.

After completion of installation of earth pits, earth resistance of the earth pit shall be measured by earth megger shall be furnished in the format and as directed by Engineer-In-Charge. ItemNo: 11.2 , 11.3 & 11.4 supply, fabrication and installation of ground bus:The scope covers Supply and laying of 25 x 3 mm, 25 x 6mm, 50 x 6mm copper flats for earthing interconnections of Transformer body, HV & LV switch gear panels, lightining protection and transformer neutral earthing. The copper flats shall be fixed on the RCC Wall/Floor as the case may be, using GI Clamps and spacers. Clamps shall be made out of adequately sized GI Flats. The GI spacers shall 6 mm thick. All fixing fasteners shall be of GI. Item No 11.5 Supply and laying of 10 SWG bare copper wire for equipment and DB earthing as per IS. Gland earthing is not included in this item Gland earthing with 8 swg cu wire for different sizes of cables are covered under end terminations. Item NO :12.1 This scope covers Supply and installation of Early streamer Emission lightning system complete with ionization device, controller etc. on the terrace of the substation building with 75 NB GI tubular structure of 5.0m high, complete with concrete pedestal and other items for structural requirements. All the required hardwares which are essential for the completion of installation shall be under the scope of bidder. Item No 12.2 This scope covers forming earth pit for lightning protection earthing with 2.5meter long 16mm dia copper rod electrode including supply of all materials, masonary chamber with cover slab required as per IS specification. Test links as shown in the drawing shall be provided on the walls. The cost shall also bear the cost of test link. Item No: 13 Electrical services for sub station building. Item No: 13.1 The scope covers supply, erection, testing and commissioning of cubicle, wall mounting type MCB / Distribution Board made out of MS sheet enclosure assembled with components as per schedule, complete with TPN tinned copper bus bar and interconnection of adequate rating, cable chamber, powder coated painting, earthing, etc., The Panel shall be flush mounted or surface mounted as per the requirement of engineer in charge The scope covers supply and installation of MCCBs and MCBs mentioned in the schedule of quantities. Item No: 13.2 This scope covers supply ,installation, testing and commissioning of MCB’s in the existing 4 way, phase segregated double door MCB DB . Incoming and outgoing feeders shall be as per schedule. Suitable dummy plates shall be provided wherever necessary.

Item No: 13.3 This scope covers supply and installation of 10HP DOL starter controlled by 40A TP MCB, all housed in a suitable sheet metal enclosure. Item No: 13.4 This scope covers supply and installation of 32A TPN MCB housed in suitable sheet metal housing. Item No: 13.5 This scope covers supply and installation of 40A TP MCB combined with 40A, 4P AC-2 duty magnetic contactor controlled by a 24 hours, cycle timer as per schedule. Item No:14.1 The scope covers supply and laying of 2 Pair Telephone wiring . The conductor shall be 0.5 mm dia copper and shall be teminated in RJ11. ferrules shall be provided for identification. Item No:14.2 The scope covers supply and laying of Cat 5(E) wire for computer wiring. The ends shall be provided with ferrules for identification.

Item No:14.3 The scope covers Supply & Installation of 20 Pair Krone terminal & stainless steel finger. The junction box shall be made of SMC or thermosetting material. The scope covers the termination of all the telephone cables into the krone with ferrules. Item No:15.0 The scope covers Supply, Installation, Testing and Commissioning of modular plates in the corresponding boxes which are already embedded. Item No: 16.1 The scope covers pulling wires in the existing conduit for Lighting Circuit main / Single phase sockets from DB to the switch control box (SB) with 3R of 2.5 Sq.mm copper FRLS cable (P + N + E) . 1 m of this item covers 3 runs of 2.5sqmm of 1m length . FRLS PVC Copper wire shall be used. Neutral & Earth can’t be looped from Nearest Point. The scope covers termination of end wire with lugs, sleeves,stickers and ferrules. Item No: 16.2 and 16.3 The scope covers pulling of wires in the existing conduit for Lighting / fan and exhaust fan from the switch box and from adjacent light / fan / Exhaust fan points. Wiring shall be done with 2R of 1.5Sqmm for P,N and 1R of 2.5 sqmm for E, copper conductor FRLS PVC insulated 1100V grade wire.

Neutral & Earth can be looped from Nearest Point. The scope covers termination of end wire with lugs and ferrules. Item No 17.0 The scope includes supply and installation of the specified components of specified make, in the corresponding boxes already embedded. The components and boxes shall be properly aligned and leveled by repositioning the boxes wherever required and making good the wall surface. All fixing screws and accessories shall be supplied by the contractor. Item No 17.1 The scope covers Supply, Installation, Testing and Commissioning of 6A switches. Item No 17.2 and 17.8 The scope covers Supply, Installation, Testing and Commissioning of 6&16A Socket. The 6A & 16A socket shall be combined shuttered socket. The 6A socket shall be 5 pin shuttered type. Item No:17.3 The scope covers Supply, Installation, Testing and Commissioning step type(Five step) Fan Regulator dimmer 400W. Item No:17.4 The scope covers Supply& Installation of Blank plates. ItemNo : 17.5 and 17.6 The Scope covers supply, installation,testing and commissioning of RJ11 and Rj45 shuttered outlet. The scope covers connection of RJ 11 with telephone wire.

Item No:17.7 The scope covers Supply, Installation, Testing and Commissioning of 16A Switches. Item No 18.0 The scope of work includes supply, transportation, installation, testing and commissioning of lighting fixtures of approved make and type along with lamps and other accessories/ fixing materials as per the specification. Lighting fixtures are to be suspended from embedded junction box with ball, socket and downrods/conduit nipples and check nuts or directly mounted to ceiling. The fixtures shall be tested before installing , downrods shall bepainted with approved color. Item No: 18.1 The scope covers Supply, Installation, Testing and Commissioning of 1 X 40 W surface mounted Mirror Optics with serrated aluminium cross louvers. The scope covers termination of end wire with lugs, sleeves and ferrules. Necessary down rods if required shall be provided and shall be included in the unit rate of this item. The scope covers all the hardwares required for complete installation of the fittings. Item No: 18.2 The scope covers Supply, Installation, Testing and Commissioning of 2 X 40 W surface mounted Mirror Optics with serrated aluminium cross louvers. The scope

covers termination of end wire with lugs, sleeves and ferrules. Necessary down rods if required shall be provided and shall be included in the unit rate of this item. The scope covers all the hardwares required for complete installation of the fittings. Item No:18.3 The scope covers Supply, Installation, Testing and commissioning of 2 X 11 W Surface Fitting. The fitting shall be anchored into the ceiling. The junction box shall be made of GI. The cost should include all the materials necessary for the completion of wiring and energisation. The scope covers termination of end wire with lugs, sleeves and ferrules. Item No: 19.1 The scope covers supply, installation, testing and commissioning of 1200 mm Ceiling Fan with double ball bearing. Down rods to be provided as per site requirement. The cost should include all the materials necessary for the completion and energiation. The scope covers termination of end wire with lugs, sleeves and ferrules. Item No: 19.2, 19.3 The scope covers supply installation testing and commissioning of 200mm and 300mm Exhaust Fan with gravity type nylon or FRP Louver shutter. Proper fixing arrangement shall be made. The scope covers supply of 3C×1.5Sqmm wire for connecting to the power point. The cost should include all the materials necessary for the completion and energiation. Item No 20:

The scope covers laying of free issued 11KV PVC floor mat for panel room and transformer room as per instruction of engineer – in- charge. Item No 21,22, 23 and 26 Supply and installation of Notice boards and key boards. Supply and installation of notice board and key board. The dimensions shall be 1.5m (length) x 1 m (width) x 40mm thick. Item No 24 Supply and installation of cable/ Line discharge rods. Scope of work involves supply of FRP (fiber class line discharging Pole) conforming to the following specifications. Material

:FRP

Sections

: 1 or multi

Length

: 1000 mm

Dia of the pole

: 27 x 32mm

Wall thickness of the pole : 33mm Line clamp Earthing lead

: spring controlled with copper contacts suitable round/flat conductors up to 30mm dia. : 1 x 10mts long 4 sqmm PVC insulated flexible copper conductor cable, 1000volts grade/IS694

Type tested

: 11KV

Quantity required

: 3 Nos of each 1 meter long.

Socket for clamp end and crocodile clip for earthing end with soldered ends shall also be supplied. Item No 25 The first aid box shall be made out of teak wood frame, three sides covered by laminated novapan sheets. The front door shall be teak wood frame fitted with glass pan fitted and godrej brass 5 lever lock with 2 keys. The first aid box shall consist the following a. Sterlized cotton 50 grams

- 10 rolls

b. sterilized bandage clothes

- 10 rolls

c. Johnson and Johnson plain plaster

- 2 rolls

d. savlan 100Ml

-1 bottle

e. Burnol 50 mg

- 1 tube

f. Soframycin 50 mg

- 1 tube

g. Shock treatment chart in tamil/English

- 1 No

h. Resuscitator

- 1 set

i. Electrical rubber hand gloves 14”

- 1 pair

(33KV tested with ISI mark) Item No 26 Supply and installation of white write board. Supply & installation of white board of size 1.0 m x 1.5 m with Aluminium edging alround. Item No 27 The white board dimensions shall be 1.5m (length) x 1 m (width) x 20mm thick. The single line drawing shall be made with stickers on this display board. Item No 28 Supply and installation of fire buckets. Fire buckets which are to be provided as a mandatory safety requirements shall be supplied transported and installed as directed by engineer in charge(Electrical). All necessary frame work arrangement with canopy at the top shall be provided. Each stand shall have 3 fire buckets filled with sand.

Item No 29 Supply, installation and testing of fire alarms and controls

TECHNICAL SPECIFICATION FOR INTELLIGENT ADDRESSABLE FIRE ALARM SYSTEM SPEC. DOC. / FA – 1.0

1.1

SCOPE The scope of work under this head shall include supply, and installation of Fire Alarm System. The work under this system shall consist of supply, installation, testing, training and handing over of all materials, equipments and appliances and labour necessary to commission the said system, complete with Smoke sensors, Repeater Panel, Sounders, Manual Pull Stations, Modules, relays etc. for interfacing with other devices . The system shall act as a loop when it is interconnected with FACP to be installed in Project Station Building . It shall also include laying of cabling, necessary for installation of the system as indicated in the specification and Bill of Quantities. Any openings / chasing in the wall / ceiling required to be made for the installation shall be made good in appropriate manner.

STANDARDS The System shall meet the following design Standards as required by the law of the country. If no specific local laws are available NFPA 72 shall be followed. National Fire Protection Association (NFPA) – USA: No. 72 National Fire Alarm Code Underwriters Laboratories Inc. (UL) – USA: No. 268 Smoke Detectors for Fire Protective Signaling Systems No. 864 Control Units for Fire Protective Signaling Systems No. 268A Smoke Detectors for Duct Applications No. 521 Heat Detectors for Fire Protective Signaling System No. 464 Audible signaling Appliances No. 38 Manually Actuated Signaling Boxes No. 346 Water flow Indicators for Fire Protective Signaling systems No. 1971 Visual Notification Appliances BS 5839 & Local fire Code APPROVALS The system shall have proper listing and / or approval from the following nationally recognized agencies: UL

Underwriters laboratories Inc

ULC

Underwriters Laboratories Canada

FM

Factory Mutual

MEA Material Equipment Acceptance (NYC) CSFM California State Fire marshal The fire alarm detectors, devices, sounder, strobes etc., shall be UL approved components.

Standard Specification for an Automatic Addressable Analogue Fire Detection System 1.3.

Device address Each device on line must be uniquely identifiable by the control unit. This must be achieved by pre-setting the address of each device. Removal of a detector head from its base must extend a fault condition to the control unit.

1.4

Device identification The identification of each type of address unit and each type of sensor (i.e. Smoke and heat detectors, sprinkler switch, etc.) must be transmitted to the panel on each polling scan.

1.5.

Device status The condition of each line device, including circuit, calibration and contamination, must be transmitted to the panel on each polling scan.

1.7.

Calibration The system must check the calibration of each analogue line device and record changes caused by environmental contamination. When maximum calibration adjustment is reached the panel must indicate a “maintenance” signal. This must be a dedicated signal, and must be separate from the “pre-alarm” signal. The build-up of dirt or similar contamination cause the output signal from the detector control panel shall be capable of monitoring and at a predetermined level indicate that servicing.

1.8.

on the optical surfaces will to gradually change. The this slow change in signal the detector is in need of

Display and indicators All display and indicators shall be LCD for text, and LED for lamp indication. The type, calibration, sensitivity and status of each device must be able to be displayed at the control panel.

1.9.

Number of devices in alarm There shall be no limit to the number of devices which may be in alarm simultaneously. When a detector is in alarm an LED in it’s head or base shall be switched on.

1.10.

Line protection and monitoring The addressable line must be monitored for short circuit or open circuit. The occurrence of an open circuit shall cause a fault signal on the panel, but all sensors or devices shall function correctly. The occurrence of a short circuit shall cause no more than 20 sensors or callpoints to cease operating, and all remaining devices shall function correctly.

2.

Loop Operation

2.1.

Addresses 2.1.1. The loop devices shall each have a unique address. Each device may be addressed as often as is required. 2.1.2. There shall be no preset order for addressing the devices. The devices shall be addressed appropriate to site conditions. This order will be determined during system design or commissioning. Every device must be checked by the control panel every 2 seconds. In order to maintain system integrity, the panel must not bypass any sensors during a scan. 2.1.3. The control panel will have the facility of determining if more than one device has the same address on the loop. A “double address” alarm shall be given if this occurs.

2.2.

Loop Devices 2.2.1. It shall be possible to fit a range of sensors and devices to the loop, as indicated in detail later in this specification.

2.2.2. Sensors shall transmit data to the control panel every 2 seconds, which shall be interpreted by the algorithm allocated to the particular sensor. Response shall be determined by the characteristics of the algorithm. 2.2.3. Manual callpoints shall each have their own unique address and the panel shall be capable of identifying and responding to the operation of a callpoint within three seconds, as required by BS5839. 2.2.4. Loop sounders shall be powered directly from the addressable loop, without requiring any additional wiring. It shall be possible to fit up to 20 sounders onto each loop, depending on the size and length of the loop cabling. 2.2.5. It shall be possible to fit loop isolators at a maximum spacing of one per 20 devices. The isolators shall protect against short circuits, and partial short circuits, on the loop by isolating that section of the loop where the short circuit occurred, thus maintaining the integrity of the remainder of the system. 2.2.6. Fire condition LED indicators fitted to the devices and any remote indicators shall be remotely and separately operated from the control panel. 2.3

Interfacing to other systems. The loop shall be capable of receiving information form third-party systems, e.g. Operation of sprinkler system, by means of standard interface units. The source of this information shall be identified by its own unique address. In addition, the interface unit shall indicate to the panel the type of alarm, e.g. “Sprinkler”, “security”, etc.

2.4.

Device monitoring 2.4.1. The panel shall monitor each device on every scan, and give a fault signal for any of the following conditions within 30 seconds: 2.4.1.1. Detector removed 2.4.1.2. Address unit removed 2.4.1.3. Incorrect device type 2.4.1.4. Faulty calibration or sensitivity

2.5.

Line capacity The capacity of the address line shall be at least 127 addressable devices. These must be input devices, such as smoke sensors, or output devices, such as sounders or relays.

2.6.

Floating Thresholds The alarm thresholds of each analogue detector shall vary individually in accordance with its idle status. This includes alarm thresholds, rate

3.

algorithms, pre-alarm and maintenance thresholds. When the threshold reaches its maximum limit, the panel must be able to indicate a “maintenance required” signal for the particular detector. This must be separate to a “pre-alarm” signal. The use of a combined signal for “prealarm/maintenance” is not acceptable. Device Types 3.1.1. It shall be possible to connect the following detectors/devices to the control unit addressable loop: 3.1.1.1. 3.1.1.2. 3.1.1.3. 3.1.1.5. 3.1.1.6. 3.1.1.7. 3.1.1.8. 3.1.1.9. 3.1.1.10.

3.2.

Optical smoke sensors – analogue type Heat sensors – analogue type Manual callpoint “break-glass” units Addressable relays i.e. Output devices Interface Units i.e. Input devices Addressable Sounders (Loop powered) Sounder Circuit Controllers Addressable Remote LED Indicators Loop Isolators

Intelligent Point Sensors: General Requirements 3.2.1. Sensors shall have complete electromagnetic and electrostatic protection against externally generated noise and the effects of devices such as fluorescent light fixtures, variable frequency motor controllers, cellular telephones, and electrical surges from other sources. Protection must meet the European Directive CE336/89, and must comply with the following standards: a) IEC801-1: b) IEC801-2: c) IEC801-3: d) IEC801-4: e) IEC801-5: requirements

General surge protection requirements Electrostatic discharges Radiated Electro magnetic interference Voltage transients – Fast transient bursts Process equipment: surge immunity

In addition, sensors must be fully resistant to RFI interference to a signal strength of 10v/m over a frequency range of 1MHz to 1000 MHz, and a signal strength of 50v/m over 50v/m over cellular telephone signal ranges 450 – 466 MHz, and 890 – 960 MHz. 3.2.2. The sensors shall be suitable for connecting to a ZP fire alarm panel using a two wire circuit, and compatible with ZP hardware and software protocol. Data transmission to and from the control panel from the detector shall be via an integrated communication protocol which is factory fitted to the detector by the original detector manufacturer and forms a complete and integral part of the detector. The system shall operate satisfactorily within the supply voltage range of 17V – 28V dc. 3.2.3. An indicator LED shall be provided on the detector which illuminates when the detector is in an alarm condition. The indicator shall be operated independently of the detector from the central control panel. 3.2.4. Provision shall be made for an output from the detector suitable for operation of a remote indicator LED. The output shall be operated independently of the smoke detector from the central control panel.

3.2.5. Sensors must plug into separate mounting bases with a twist-lock action. The bases shall be fitted with corrosion resistant connector springs and terminal screws with captive clamping plates. 3.2.6. All bases shall incorporate a concealed security lock to prevent unauthorized removal or tampering with sensors. It shall be possible to activate the security lock in areas where required. With the security lock activated, it must only be possible to remove a sensor from its base using a special tool. 3.2.7. There shall be a facility on the base for attaching a label indicating the address of that detector. A similar facility shall be available on the detector, enabling the fitting of a label indicating its address. When the detector is fitted to its base, both the detector and base address labels shall be visible, and aligned adjacent to each other. 3.2.8. Smoke entry points must be protected against insect ingress by corrosion resistant mesh. 3.2.9. The detector shall be supplied complete and fully tested and calibrated. 3.2.10.

The unique address of the detector shall be set by the installer using high integrity sealed dip switches.

3.2.11.

The sensors must be unobtrusive when installed, having a dimension not exceeding 70mm x 115mm diameter maximum including the mounting base.

The detector shall be capable of being remotely tested from the control panel by the transmission of a test instruction to the addressed detector. This shall result in a healthy detector transmitting back smoke and thermal analogue values in excess of the recommended fire alarm threshold. The control panel will recognize this signal as a test result and shall not raise an alarm against this signal.

3.2.13. The detector shall have twin LEDs and shall have 360 viewing angle. LED on the detector shall blink each time the sensor is scanned by the FACP. If the FACP determines that the sensor is in alarm, the FACP will command the sensor LED to remain on to indicate the same. Each sensor will be capable of being tested for alarm via command from the FACP. Each sensor shall respond to FACP scan with the information about its type for identification. 3.2.14. The detector shall be programmed using a hand-held programmer and address stored in a non-volatile memory within the sensor or by a decade / Rotary switch or shall be thro an electronic addressing. 3.3.1. Photoelectric (optical) smoke sensors (analogue/addressable) 3.3.1.0. The photoelectric optical smoke sensors must comply fully with the general requirements for intelligent point sensors as specified in paragraph 5.2.

3.3.1.2. Photoelectric optical smoke sensors shall comply with standard EN54-7. 3.3.1.3. The photoelectronic optical smoke sensors shall be suitable for detecting visible smoke such as is produced by slow smouldering fires. 3.3.1.4. They shall be of the light scattering type using a pulsed internal LED light source and a photocell sensor. 3.3.1.5. The detector shall be capable of protecting an area up to 100m2 at a height of up to 12m. The installation and siting of the sensors must conform to BS5839 Part 1 (1980), or similar Standards. 3.3.2. Heat sensors (analogue/addressable) 3.3.2.1. The heat sensors must comply fully with the general requirements for intelligent point sensors as specified in paragraph 5.2. 3.3.2.2.

Heat sensors shall comply with standard EN54-5 (1996).

3.3.2.3. The heat detector shall be electronic in operation, and shall monitor ambient temperature by means of a NTC thermistor. 3.3.2.4. Each detector shall be suitable for protecting an area up to 50m2 at a height of up to 7,5m. The installation and citing of the sensors shall be carried out in accordance with standards BS5839 Part 1. 4.

System Maintenance

4.1.

General 4.1.1. The system shall be, as far as possible, self-testing and maintenance free. 4.1.2. The control unit shall continually update the idle state of each detector, and indicate a “maintenance required” signal in the event of a detector sensitivity being too high or too low.

5.

System Wiring

5.1.

Loop Wiring Configuration 5.1.1. The system device address loops shall each operate on a single two-wire circuit, which shall be normally screened to provide absolute reliability at all times, and in all environments. 5.1.2. The system shall meet the requirements of European Union Directive CE336/89 for the ability to perform satisfactorily under conditions of electrical surges and transients, and shall comply fully with the requirements of the following standards as required by EN54: IEC 801-2 IEC 801-3

Electrostatic discharges Radiated Electro magnetic interference

IEC 801-4

Voltage transients – Fast transient bursts

5.1.3. Wiring is to be suitable for return loop arrangement, or single direction arrangement. Tee-off’s must be permitted, with full monitoring. 5.1.4. When used with sensors, call points, and interface-units, the system shall operate satisfactorily with a loop length of up to 3500 meters, of a cable type and size as specified by the equipment manufacturer. 5.1.5. When used with high-power devices, such as loop-powered sounders, in addition to sensors, call points and interface-units, the system shall operate satisfactorily with a loop length of up to 1000 meters, of a cable type and size as specified by the equipment manufacturer. 5.1.6. It shall be possible to carry out a high-voltage electrical test on a complete loop of cable, with the bases connected, but with sensor heads removed, without damage to any electronics. Manual callpoint The call point shall be manufactured from red injection moulded plastic. Manual call points shall comply with standard BS5839. The overall size of the call point shall not exceed 100 mm x 100 mm x 60 mm. It shall consist of an enclosure, with a captive glass pane, and it shall incorporate an addressable communications module. Breaking the pane shall initiate an alarm, no secondary action shall be required by the operator. The callpoint shall incorporate a plastic-laminated safety glass which will not produce sharp edges when broken, thereby protecting the operator from injury. An externally visible LED must be incorporated to indicate when the device is in alarm. The LED shall illuminate when the callpoint is activated. However, the illumination of the LED will be by command from the control panel. SHORT CIRCUIT ISOLATOR This unit shall be placed on the loop preferably after every 20 devices and shall be able to isolate electrical short circuit in the wiring. All the other detectors shall remain functional because of the Class A wiring of the loop. Isolator modules / Base shall be provided to automatically isolate wire-towire short circuits on an SLC Class A or Class B branch. The isolator module shall limit the number of modules or detectors that may be rendered inoperative by a short circuit fault on the SLC loop segment or branch. At least one isolator module shall be provided for each floor or protected zone of the building. If a wire-to-wire short occurs, the isolator module / Base shall automatically open-circuit (disconnect) the SLC. When the short circuit condition is corrected, the isolator module shall automatically reconnect the isolated section. The isolator module / Base shall not require any address-setting, and its operations shall be totally automatic. It shall not be necessary to replace or reset an isolator module after its normal operation. It shall provide a single LED that shall flash to indicate that the isolator

is operational and shall illuminate steadily to indicate that a short circuit condition has been detected and isolated. The Isolator shall have UL approval. SOUNDER / SOUNDER WITH STROBE The sounder shall be electronic type and shall give discontinuous / intermittent audible alarm from a command from the Addressable Bell relay modules whenever any detector or call box operates. The sound output from the Hooter should not be less than 85 decibels at the source point. It shall be capable of being directly mounted on the wall / ceiling. The sounder shall be programmed to get activated in event of an alarm from a single detector / device or a group of detectors / devices. The strobes shall be an electronic visible warning signal device that flashes at least once in every 1.5 Seconds in an event of an alarm. The strobe light shall use Xenon flash tube with low current requirements. The outer cover of the Strobe shall have a printed fire signal warning. The electronic circuits inside the strobes shall be compatible with DC alarm supervision and meet the required safety standards. The strobes shall be mounted on the sounder or on the wall / ceiling and shall be UL Listed. The light intensity shall be at least 1.5 candela at 24 VDC. The sounder / strobe shall be powered from the FACP panel and no separate power supply should be used. It shall be capable of being directly mounted on the wall / ceiling. The sounder relay module shall be programmed to activate the sounder in a wing in event of an alarm from a single detector / device or a group of detectors / devices. DUCT HOUSING FOR SMOKE ADDRESSABLE DETECTOR The Duct Housing shall be placed in each return air duct to Sense Smoke in the return air. The Duct Housing shall accommodate the addressable Smoke detector as specified above. The Housing shall be capable of withstanding air velocities from 500 to 4000 FPM. It shall have the facility to connect a remote LED. It shall be capable of mounting easily into rectangular or circular ducts. It shall have an integral filter system to reduce dust. Sampling tube shall be easily installed after the housing mounted to the duct. The duct detector housing shall incorporate an airtight smoke chamber for mounting the detector. The housing shall be capable of mounting either in rectangular or circular ducts. The sampling tube both for inlet & outlet shall be easily installed after housing is mounted to the duct by passing thro the duct housing. It shall be capable of Local Testing using a test Magnetic switch. The unit shall be reset using a local reset button. The Duct housing shall have UL approval. CABLES The Cable shall be pliable fire resistant designed as per BS 5839 – 1: 2002 standards. It shall be of low smoke, zero halogen and construction and easy to terminate and install. Also the cables shall approved by UL as per UL 2196 standards. The Cables shall meet the followings requirements.

No of Cores Nominal dia of conductor Nominal insulation Thickness Maximum conductor resistance Capacitance pf / m core to core

: : : : :

2 1.13 mm 0.6 mm 18.1 mm 85

The strands of cable shall not be cut to accommodate and connect the terminals. Terminals shall have sufficient cross sectional area to take in all the stands. Cables shall be laid by skilled and experienced workmen. Great care shall be taken while laying cables to avoid kinks. At all changes in directions (vertical & horizontal planes) the cables shall be bent smooth with a radius as recommended by the manufactures. All cables should run in a separate flame proof/metallic conduits. 12.

TESTING

12.0. COMMISSIONING TEST Commissioning of the entire installation shall be done in the presence of the owner and / or its representative. All necessary instrumentation, equipment, materials and labour shall be provided by the Contractor. The Contractor shall record all tests and system calibrations and a copy of these results shall be retained on site in the system Log Book. FUNCTIONAL TEST Introduce Smoke into the Detector Assembly to provide a basic functional test. Introduce smoke to the least favorable Sampling Point in each Sampling Pipe. Transport time should not to exceed 90 Seconds. 12.2. DOCUMENTATION a. The bidder shall be authorized and trained by the manufacturer to design, install, test and maintain the Detection system and shall be able to produce a certificate issued by the manufacturer along with the offer. The bidder shall submit computer generated software calculations for design of aspirating pipe network, on award of the contract. Product data and performance criteria shall be submitted by the bidder. The bidder should provide, as part of handing over, the as-built drawing, operation manual and maintenance manual. WARRANTY: The supplier shall ensure guarantee by executing periodical testing and cleaning (preferably once in a month) of all FA equipments, devices in the network during the warranty period. LIST OF APPROVED MAKES FOR ADDRESSABLE FIRE ALARM SYSTEM Repeater Panel Addressable Smoke Detector

:

Edwards / Notifier / Cerebrus / Simplex / Morley : Edwards / Notifier / Cerebrus / Simplex / Hochiki

Addressable Heat Detector

:

Duct Housing

:

Short Circuit Isolator Addressable Manual Call Point

:

Sounder with relay Module

:

Strobes

:

Cables Batteries

: :

Edwards / Notifier / Cerebrus / Simplex / Hochiki Edwards / Notifier / Cerebrus / Simplex / Hochiki : Edwards / Notifier / Cerebrus / Simplex / Hochiki Edwards / Notifier / Cerebrus / Simplex / Hochiki Edwards / Notifier / Cerebrus / Simplex / Hochiki Edwards / Notifier / Cerebrus / Simplex / Hochiki Pyrotenax / Beldon / UL approved CSB / Exide / Hitachi / GS