Working of ELCB

Working of ELCB
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1 Answer

Answer :

Practical Significance

ELCB or RCCB, is a life-saving device which is designed to prevent human life from electric shocks. This device provides the safety in an electrical installation, therefore, it is essential to know the working of this component.


Minimum Theoretical Background

An Earth—leakage circuit breaker (ELCB) is a safety device used in electrical installations. It protects operator, instruments, as well as circuit while earth leakage.

There are two types of ELCB: Voltage operated and current operated. Voltage operated ELCBs are old ones, they are not used now in new installations. However, Current operated ELCBs are widely used. These current operated ELCBs are called Residual Current Circuit Breakers (RCCBs). It is also called Residual Current Device (RCD). However, the popular name of this device is ELCB.


Basically RCCB works on the principle of Kirchhoff’s Current Law (KCL) (i. e. incoming current is equal to outgoing current). Residual current is a difference between Line current and neutral current. At the event of earth leakage, current finds the earth path; hence imbalance occurs between line current and neutral current. The coil in a toroidal transformer (in RCCB) senses residual current which is connected to relay.


Practical set-up / Circuit diagram / Work Situation

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Resources Required

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Precautions to be followed

1. While testing ELCB proper ratings of fuses should be used in ICDP.

2. Precautions should be taken while operating knife switch.


Procedure

i. Record the observations.

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