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A bar primary current transformer has its primary formed by

  • A.the main conductor itself passing through the core
  • B.a winding of a few thick turns wound round the core in the usual way
  • C.a bar of magnetic material inserted into the window of the core
  • D.the secondary winding reconnected in series for the higher current ranges

Answer: A

For a large current a single turn is enough, and the simplest single turn is the busbar or cable itself threaded through the core window. There is no primary winding to insulate, which is a great simplification at high voltage.

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