Hpi Rcd

Different types of RCDs Purely AC Applications

pe AC with built-in time delay

ications with AC and DC components

Type A with built-in time delay

Type AC Type AC - S

Type A

Type A - S

Different types of RCDs What about Hpi ?

All the above + more … i.e Type A + more …..

Why Hpi ? Required for the following applications :

Special Loads Disturbed Network Extreme Climatic Conditions

Special Loads

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Equipments using rectified / half wave Leakage after rectification is Pulsating DC

Special core of Hpi suitable to sense pulsating DC. Hence, it trips on harmful leakage current. Thereby ensuring improved human protection

Ex. Power Control Equipment, Lighting Control Dimmer, DC Motors,SMPS, Hair Dryers, Variable Speed Drives Etc.

Equipments working on high frequencie

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Leakage is high frequency

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Special core of Hpi suitable to sense high frequen leakage

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Hence, it trips if leakage is above harmful level.

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Thereby ensuring improved human protection

Ex. SMPS, Variable Speed Drives, Industrial Furnaces, Power electronics equipments etc.

Loads generating high frequency emissi

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Loads have filtering condensers connected between Phase - Earth & Neutral - Earth as per High frequency emissions ☛ IEC directives diverted to earth ☛ Transient leakage condition generated pecial Electronic Circuit of Hpi avoids nuisance tripp Thereby ensures service continuity Ex. Flourescent lighting with electronic ballast, Dimmers, Luminous Signs, Telecom transmitters, microwave ovens etc.

Switching of loads with high earth capacitance Equipped with interference filter

Permanent leakage exists. But not because of insulation failure

ight additional transient leakage can cross sensitivit evel of RCD.

ecial Electronic Circuit of Hpi avoids nuisance trippin Thereby ensures service continuity Ex. Computers, Printers, Copiers, X-ray installation, VCDs, ACD, Cash Register etc.

Use of VSP downstream to RCD VSP passes surge current to earth Transient leakage condition created

ecial Electronic Circuit of Hpi avoids nuisance trippin

sures possibility of having close voltage surge protec ownstream with continuity of service

Disturbed Network

Switching of Inductive Loads

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During opening & closing, transient voltage surge is generated Transient leakage condition created

ecial Electronic Circuit of Hpi avoids nuisance trippin

Thereby ensures service continuity

Ex. Neon Lights, Induction Motors, Transformers, Electromagnets, switching of MV switchgear etc.

Lightning Surges

Generates transient leakage current

ecial Electronic Circuit of Hpi avoids nuisance trippin

Thereby ensures service continuity

Capacitive Effects of long lines long cable networks - capacitance formed between cable & earth

or AC current, capacitance discharges current

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which is

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lenght

Transient leakage generated

ecial Electronic Circuit of Hpi avoids nuisance trippin

Thereby ensures service continuity Ex. Ground heating systems, Large building Installations, etc .

Extreme Climatic Conditions

Sub Zero Temperature

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For temperature ≤ 0 0 C

Electromagnetic chara of core of Hpi type RCD rem unchanged

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Special Core of Hpi enables tripping -- can operate between - 25 0 C to + 55 0 C Thereby ensuring improved human protection

Ex. Cold Storage, Medicine Refrigerator, Hilly Areas etc.

Hpi type RCDs ensures :

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Service continuity Improved human protection for

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Special Loads Disturbed Networks Extreme Climatic Conditions

Where loss of data is harmful

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Computer Installations in Banks, IT Parks, Army etc

Where discontinuity of supply is harmful

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ATMs, OT Equipments,etc Cold Storage, Refrigeration systems Data transmission system

Isolated installations difficult to reach

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Weather stations Radio & TV transmission towers

In rough conditions

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Ground heating systems

RCCBs ✒

2 pole and 4 pole

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Rated currents 25, 40, 63 and

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Sensitivity 30 mA

RCBOs ✒

SP+N (neutral on left side)

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Rated currents from 10 A to 4

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Breaking capacity

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Sensitivity 30 mA

6000 A