Power Systems
Earth fault relay uses the which of the following sequence currents?

 negative sequence
 positive sequence
 zero sequence
 any of the above

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Power Systems
In a biased differential relay the bias is defined as the ratio of

  fault current and operating coil current.
  number of turns of restraining and operating coil.
  operating coil current and restraining coil current.
  fault current and restraining coil current.

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