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A summation current transformer is used to

  • A.provide a second secondary winding on a transformer that has only one
  • B.combine the currents of several circuits into one output
  • C.add the ratio errors of several transformers so that they may be corrected together
  • D.raise the secondary current of an existing transformer to a standard value

Answer: B

Several primary windings on a common core, each fed from the secondary of a line current transformer, produce a single output proportional to the sum. It is used where one instrument or relay is to see the total of several feeders.

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