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Turns compensation in a current transformer means

  • A.making the secondary turns slightly fewer than the nominal number
  • B.adding a few turns to the secondary so that the ratio error becomes positive
  • C.reversing one primary turn so that the exciting ampere-turns are cancelled
  • D.winding the secondary in two halves connected in parallel with each other

Answer: A

Reducing the secondary turns by one or two raises the secondary current a little, which offsets the part of the primary current lost to magnetisation. It corrects the ratio error at one chosen current and burden but does nothing for the phase angle error.

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