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What is the function of restraining coil in differential
relay? as well as restraining current?
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Answer Posted / vikash kumar barnwal
restraining coil is given to avoid mal-functioning of differential relay.
since differential relay works on the principle of balancing the incoming and outgoing currents from alternator coils and due to the inductive effect of alternator coils, there is some phase angle difference between these currents..
so even there is no fault it may cause to operate the relay coil.
hence, restraining coil is given to limit the sensitivity of the differential relay.
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