If a transformer is provided with differentially connected relay. To prevent the mal operation of the relay, the relay relay operating coil is biased with ______

If a transformer is provided with differentially connected relay. To prevent the mal operation of the relay, the relay relay operating coil is biased with ______ Correct Answer 5th harmonic

The restraining coil will be biased not the operating coil. The transformer having heavy inrush current has 2nd harmonic components.

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We need the biasing of differential relay biased to avoid mal operation when used for transformer protection due to ____________
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