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The primary current of a current transformer is determined by

  • A.the burden connected across its secondary winding
  • B.the ratio of the transformer multiplied by its secondary current
  • C.the exciting current needed by its core at the working flux
  • D.the load on the system, not by the transformer's own secondary

Answer: D

It is a series device inserted in a circuit whose current is fixed by the load elsewhere. This is the reverse of a power transformer, where the primary current follows the secondary load, and it is the reason an open secondary is so dangerous.

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