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An earthing of the current transformer secondary circuit at one point is provided in order to

  • A.reduce the burden imposed by the connecting leads on the transformer
  • B.prevent the secondary circuit from being left open by accident
  • C.limit the voltage to earth if the primary insulation fails
  • D.give the exciting current a path back to the core of the transformer

Answer: C

The secondary circuit is at panel level but its winding sits next to a conductor at system voltage, so a failure of the insulation between them could raise the whole secondary circuit to that potential. One earth point, and only one, holds it down safely.

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