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

If a transformer is provided with differentially connected relay. To

1.	If a transformer is provided with differentially connected relay. To prevent the mal operation of the relay, the relay restraining coil is biased with ______________
A.	3rd harmonic
B.	2nd harmonic
C.	7th harmonic
D.	5th harmonic
Answer» C. 7th harmonic

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

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