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The errors of a current transformer are greatest at

  • A.currents well above rated
  • B.unity power factor of the burden connected to the secondary
  • C.low primary current
  • D.rated primary current

Answer: C

The exciting current does not fall in proportion to the primary current, so at a tenth of rated current it is a much larger fraction of the whole and the error is correspondingly worse. Accuracy classes therefore specify limits at several fractions of rated current.

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