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STATIC ELR

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Static Earth Leakage Relay(ELR) employs a Core Balance Current Transformer (CBCT / ZCT) to sense the leakage current. The CBCT / ZCT mounted externally and load current carrying cable is passed through the CBCT / ZCT. Ideally in a leakage free system the incoming and outgoing currents are equal and opposite in direction, which means that the vector sum of three phase currents is zero.In case of the Earth Leakage due to insulation failure of direct line to ground fault, the vector sum of currents is not zero and therefore generates resultant magnetic flux in the CBCT / ZCT and signal is fed to the electronic circuit of Earth Leakage Relay (ELR). This signal is compared with internal reference determined by the selected position of the leakage current scale in the front facia of the relay.

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