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 restraining coil current.
  fault current and operating coil current.

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Power Systems
In order to have lower cost of power generaion

 the load factor and diversity factor should be low
 The load factor and diversity factor should be high
 the load factor should be low but diversity factor should be high
 the load factor should be high but diversity factor should be low

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