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The ratio correction factor of an instrument transformer is

  • A.the reciprocal of the accuracy limit factor of the transformer
  • B.the difference between the turns ratio and the nominal ratio
  • C.the factor by which the nominal ratio must be multiplied to give the true ratio
  • D.the ratio of the phase angle error to the ratio error at rated burden

Answer: C

Multiplying the nominal ratio by this factor gives the actual ratio, so a reading scaled by the nominal ratio is corrected by the same factor. It is a little above or below unity, and precision work applies it rather than accepting the class limit.

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