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The ratio error of a current transformer arises because

  • A.the frequency of the system differs a little from the design value
  • B.part of the primary current magnetises the core
  • C.the resistance of the secondary winding drops part of the induced voltage
  • D.the secondary winding has slightly fewer turns than its nominal number

Answer: B

The primary ampere-turns must supply the secondary ampere-turns and in addition magnetise the core and cover its loss. The exciting component is therefore missing from the secondary, so the actual ratio differs from the turns ratio.

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