Motor Switching And Protection

MOTOR SWITCHING AND PROTECTION IEC 947-4

ABB SACE

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MOTOR DATA • P = Rated motor power (kW) • V = Supply voltage (V) • cos ϕ = Power factor ∀ η = efficency P In = ------------------------ = rated current V x 1.73 x cos ϕ x η ABB SACE

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MOTOR CURRENTS • In = Rated nominal current • Ia = Rated starting current (8-10 x In) • Ip = Maximum peak inrush current (13 - 15 x In) ABB SACE

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MOTOR STARTING CURRENT t (s)

In

Ia

Ip ABB SACE

I (A)

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MOTOR PROTECTION 2

1

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TIME - STARTING CURVES • 1 MOTOR START UP • 2 OVERLOAD PROTECTION (THERMAL) • 3 SHORT CIRCUIT PROTECTION (MAGNETIC) ABB SACE

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DIAGRAM A 1 CIRCUIT BREAKER WITH MAGNETIC RELEASE (Short circuit protecting device)

2 CONTACTOR (Switching device) 3 THERMAL OVERLOAD RELEASE (Overload protection) M ABB SACE

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DIAGRAM B 1 CIRCUIT BREAKER WITH ELECTRONIC RELEASE (Short circuit and overload protecting device)

2 CONTACTOR (Switching device) M ABB SACE

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DIAGRAM C 1 CIRCUIT BREAKER WITH ELECTRONIC RELEASE (Short circuit and overload protecting device and switching device)

M

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DIAGRAM A • High number of motor switcing • TOR on contactor • Most common application up to now

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DIAGRAM B • High number of motor switching • No TOR on contactor • PR212/MP electronic release • New and future application

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DIAGRAM C • No contactor and TOR • Low number of motor switching • ACB with electronic release • Typical application for big motor sizes (Power > 250 kW/400 V)

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PR 222MP I: istantaneous adjustable short circuit I3=6-7-8-9-10-11-12-13 x In

L

t

L: Inverse long delay overload

Class

I1=0.4-1 x In step 0.01 x In R: Locked rotor protection I5=3-4-5-6-7-8-10 x In t 5=1-4-7-10 sec.

R

U t5 4 sec

U: Phase loss/unbalance

I

OFF or ON: 4 sec. Tripping time @ one phase current 0.4 times I1 ABB SACE

0.4 x In

I1

I5

I

I3

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PR 222MP Protection LLProtection againstoverload overload against

CLASS CLASS starting startingclass class according accordingto toIEC IEC 947947-44

ABB SACE

RRProtection Protection against againstlocked lockedrotor rotor

Protection UUProtection againstphase phase against loss/unbalance loss/unbalance Protection I IProtection againstshort shortcircuit circuit against 14

TRIPPING CLASS

ripping class from 10 A to 30 defines the time-curre urves of the thermal overload release during startin nd on duty service (overload and phase loss)

10 A - 10 - 20 - 30 ABB SACE

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TRIPPING CLASS 10 - 10 A (Normal starting) Pump Compressor

10-20 30

(Normal starting) Ventilator

(Heavy duty) Mill

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SHORT CIRCUIT TEST

Motor protection

Duty cicle:

O - CO at “Iq” current

O : tripping of the circuit under short circuit condition breaker CO : Closing by contactor under short circuit condition and tripping of the breaker 17

COORDINATION TYPE Type 1 Damage to the contactor and/or thermal overload is acceptable as two condition are release - there is no risk to the fulfilled: - no device other than contactors and/or overload operator; release can be replaced.

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COORDINATION TYPE Type 2

The only risk permitted is light welding of the contact i,e. the contactor can easily be separated either by electrical control or using a screwdriver.

After the coordination test: all the protection device functions must still be operational; the manufacturer must prove that the contactor is st operational for further service. ABB SACE

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COORDINATION COMPARISON Type 1 - Lower investment cost - Expansive maintenance - Maintenance stop plant

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COORDINATION COMPARISON Type 2 - Higher investment cost - Cheaper -maintenance Continuity of service ABB SACE

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STAR-DELTA STARTING

K1

K2

K3

M

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COORDINATION TABLE SELECTION CHART 1 Coordination type “1” or “2” 2 Starter Direct or Star-Delta Normal or Heavy duty 3 Starting type 4 Voltage level and short circuit current “Iq” MOTOR CIRCUIT POWER BREAKER (kW) Only magnetic or With PR222MP ABB SACE

CONTACTO R Name

TOR

Name (N.A. for 222MP)

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500 V 50 kA type “2” star delta Motor Rated Rated Output Current Pe

Ie

[kW] 75 90 110 132 160 200 250 290 315

[A] 110 132 158 192 230 279 335 394 440

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MCCB Type

T4H250 MA125 T4H250 MA160 T4H250 MA200 T4H250 PR221-I In250 T4H320 PR221-I In320 T5H400 PR221-I In400 T5H630 PR221-I In630 T5H630 PR221-I In630 T5H630 PR221-I In630

Contactor Line

Delta

Star

A95 A110 A110 A145 A145 A210 A210 A260 A300

A95 A110 A110 A145 A145 A210 A210 A260 A300

A50 A75 A95 A95 A110 A145 A185 A210 A210

O/L relay Type

TA80DU80 TA110DU90 TA110DU110 E200DU200 E200DU200 E320DU320 E320DU320 E320DU320 E320DU320

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COORDINATION TABLES

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ACB MOTOR CORDINATION TABLE D.O.L. STARTING Power (kW)

In (A)

Op. Nr. ACB (AC3) (Type)

Icu (kA)

Release Type (A)

CT (A)

Up to 450

800

10000

E1B

40

1250

PR112

1250

Up to 630

1140

12000

E2N

65

1600

PR112

1600

Up to 630

1140

12000

ES3

75

1600

PR112

1600

Up to 630

1140

12000

E3H

100

1600

PR112

1600

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Rated uninterrupted current, Iu Rated service current, In Poles Rated service voltage, Ue (AC) 50-60Hz Rated impulse withstand voltage, Uimp Rated insulation voltage, Ui Test voltage at industrial frequency 1 min.

[A]

[V] [kV] [V] [V]

T2

T3

T4

T5

160 1…100 3 690 8 800 3000

250 100…200 3 690 8 800 3000

250 80…250 3 690 8 1000 3500

400 320, 400 3 690 8 1000 3500

Rated ultimate short-circuit breaking capacity Icu AC 50-60 Hz 380/415 V [kA]

N 36

S 50

H 70

L 85

N 36

S 50

N 36

S 50

H 70

L V 120 200

N 36

S 50

H 70

L V 120 200

Rated service short-circuit breaking capacity Ics AC 50-60 Hz 380/415 V [kA]

36

50

70

70

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27

36

50

70

120 200

36

50

70

120 200

154

187

75,6

105

Rated service short-circuit breaking capacity Icm AC 50-60 Hz 380/415 V [kA]



Isolation behaviour Reference Standards Protection against short-circuit Magnetic only release MA Electronic release PR221DS-I Integrated protection Electronic release Mechanical life Electrical life @ 415 V AC Fixed dimensions W 3p D H

ABB SACE

(1) MF up to In=12,5A

75,6 105

75,6 105 154 264 440

75,6 105 154 264 440

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IEC 60947-2

IEC 60947-2

IEC 60947-2 IEC 60947-4-1(with PR222MP)

IEC 60947-2 IEC 60947-4-1(with PR222MP)

 (1)

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 

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

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PR222MP 25000 8000

25000 8000

20000 10000

20000 7000

90 70 130

105 70 150

105 103,5 205

140 103,5 205

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ACB with microprocessor based motor protection release PR 112/113 EMAX E1-E2-E3 B-N-S-H 800 -1250 - 1600 A 40 - 65 - 75 - 100 kA @ 400 V Release range: From R800 A to R1600 A ABB SACE

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AND NOW… MOTOR IS READY TO START !

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