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

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

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Power Systems
Which of the following statements is/are true? The elements of each row of a Y bus matrix for load flow studies in power system add up to zero

 if the mutual couplings between transmission lines are absent
 always
 if the shunt admittances at the buses are ignored
 if both 2 and 3 are satisfied

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