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The magnetising current of a current transformer is deliberately kept small because it

  • A.would otherwise overheat the core at rated primary current
  • B.determines the voltage that appears if the secondary is opened
  • C.fixes the accuracy limit factor of the protection core
  • D.is the whole of the transformer's error

Answer: D

Every ampere-turn spent on magnetising the core is an ampere-turn missing from the secondary, so the difference between the actual and the turns ratio is exactly the exciting current. Nothing else in a well made transformer contributes appreciably.

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