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The accuracy limit factor of a protection current transformer is wanted

  • A.low
  • B.equal to unity
  • C.the same as the instrument security factor of a metering transformer
  • D.high

Answer: D

A protection transformer must reproduce the fault current faithfully, since that is precisely what the relay has to measure. A factor of ten or twenty means the ratio holds up to ten or twenty times rated primary current, which is the opposite requirement to a metering core.

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