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True or false: the errors of a current transformer are independent of the burden connected to it.

  • A.False, the burden alters the exciting current
  • B.True, since the primary current is fixed by the load on the system and not by the burden
  • C.True, provided the burden does not exceed the volt-ampere rating of the transformer
  • D.True, the burden affecting only the voltage across the secondary and not the current

Answer: A

A larger burden means a larger secondary voltage, which means a larger core flux and a larger exciting current, and the exciting current is precisely what constitutes the error. A class is therefore always quoted together with a burden.

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