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Digital Elr With Cbct

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Digital microprocessor /microcontroller based Earth Leakage Relays ( ELR) with Core Balance Current Transformer (CBCT / ZCT) employs to sense the leakage current the (CBCT / ZCT) is mounted externally and load current carrying cable are passed through the (CBCT / ZCT). Ideally in a leakage in a leakage free system the incoming and outgoing currents are equal and opposite in direction, which means that the vector sum of the three phase currents is zero In case of earth leakage either due to insulation degradation / chemical corrosion etc. the vector sum of currents is not zero and CBCT / ZCT generates voltage which is fed to the ELR. This signal is compared with the set value of leakage current and trip command is initiated if the leakage current is more than the set values of current and time.

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