Earth Leakage Relay Working Principle Pdf

Current earth leakage current earth leakage circuit breaker current elcb.

Earth leakage relay working principle pdf.

Normally earth fault relay earth leakage circuit breaker and ground fault circuit interrupter etc. An elcb is a specific type of latching relay that has a structure s incoming mains power associated through its switching contacts so that the circuit breaker detaches the power in an unsafe condition the elcb notices fault currents of human or animal to the earth wire in the connection it guards. An voltage elcbs were first introduced about sixty years ago and current elcb was first introduced about forty years ago. Earth fault relay efr it is a safety device used in electrical installations with high earth impedance.

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Are used to restrict the fault current. If ample voltage seems across the elcb s sense coil it will turn off the power and remain. It detects small stray voltages on the metal enclosures of electrical equipment. One terminal of the relay coil is connected to the metal body of the equipment to be protected against earth leakage and other terminal is connected to the earth directly.