Power Systems
Objectives of power system is/are

 Rated voltage and frequency has to be supplied to the consumers
 Cost of electrical energy per KWh is to be minimum
 nether 1 nor 2
 both 1 and 2

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

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