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A current transformer left with its secondary short circuited while the primary carries current

  • A.will drive its core into saturation exactly as an open secondary would
  • B.is in its normal and safe condition
  • C.will overheat and eventually be destroyed by the circulating current
  • D.will register a ratio error many times larger than its rated class

Answer: B

A short circuit is a burden of zero impedance, which gives the smallest possible secondary voltage and hence the smallest core flux and the smallest error. It is the condition of least stress on the transformer in every respect.

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