Power Systems
Counter poise is used for

 reduce losses
 more surge impedance
 proper discharging of lighting surges
 less surge impedance

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

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

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