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The phase angle error of a current transformer is quoted in minutes rather than degrees because

  • A.a good transformer has an error of only a few minutes
  • B.the error is always smaller than one minute in any practical transformer
  • C.minutes are the unit in which relay settings are conventionally expressed
  • D.the error varies too rapidly with current to be quoted in a larger unit

Answer: A

A metering class transformer holds its phase angle within perhaps five or ten minutes at rated current, and quoting a tenth of a degree would be clumsy. The unit is chosen to make the class limits convenient whole numbers.

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