Power Systems
What will be the ratio of the C.T. on the H.V side of a 3 - φ star / delta 33 / 11 kV transformer if the protecting CT on the LV side has a ratio of 300 : 5 ?

  200 : 5 / √3.
 150 : 4 / √3.
  100 : 5 / √3.
 120 : 6 / √3.

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

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