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The phase angle error of a current transformer is the angle between

  • A.the secondary current and the voltage across the burden connected to it
  • B.the exciting current and the loss component within it
  • C.the primary current and the reversed secondary current
  • D.the primary current and the flux in the core of the transformer

Answer: C

Ideally the reversed secondary current would be exactly in phase with the primary. The exciting current tilts it by a small angle, usually a few minutes, and that angle matters in any measurement involving phase, such as power, energy or a directional relay.

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