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A potential transformer used for protection as well as metering is designed with attention to

  • A.the ratio of its accuracy limit factor to its security factor
  • B.the shorting links provided across its secondary terminals
  • C.its behaviour when the system voltage collapses on a fault
  • D.its ability to saturate early so that the relay is protected

Answer: C

A distance or directional relay must have a faithful voltage during the fault, when the voltage may have fallen to a small fraction of normal, so accuracy at low voltage matters. Early saturation and shorting links belong to current transformers, not to these.

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