Power Systems
Per unit of any quantity is defined as

 base value of quantity /actual value of quantity in different units
 base value of quantity /actual value of quantity in same units
 actual value of quantity /base value of quantity in same units
 actual value of quantity /base value of quantity in different units

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

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

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