Earth leakage relay wiring diagram

Earth leakage relay is an electronic device that detects earth failures. the earth leakage relay needs a toroidal transformer to detect the leakage current the toroidal transformer is designed around a high-quality magnetic core that detects fault currents even in very low values.
what is cbct in breaker
core balance current transformer or cbct is a ring type current transformer through center of which a three core cable or three single core cables of three phase system passes this type of current transformer is normally used for earth fault protection for low and medium voltage system.
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