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A wound primary current transformer is used when the primary current is

  • A.direct rather than alternating, so that a rotating core may be avoided
  • B.small, so that more than one primary turn is needed
  • C.very large, a wound primary being the only construction able to carry it
  • D.of a frequency higher than the power frequency of the system

Answer: B

The ampere-turns must be sufficient to magnetise the core and drive the secondary, so a primary current of a few amperes needs several turns. Above a few hundred amperes a single bar turn suffices and the wound construction becomes unnecessary.

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