When a differential relay operating coil behaves normally?
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Explanation:
A differential relay is defined as the relay that operates when the phasor difference of two or more similar electrical quantities exceeds a predetermined amount. (ii) These quantities should have phase displacement (normally approximately 180°) for the operation of the relay.
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Among them differential relay is very commonly used relay for protecting transformers and generators from localised faults. Differential relays are very sensitive to the faults occurred within the zone of protection but they are least sensitive to the faults that occur outside the protected zone.
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