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Silsbee's method of testing a current transformer is a

  • A.means of determining the accuracy limit factor under fault conditions
  • B.comparison method against a standard transformer
  • C.absolute method in which the exciting current is measured directly
  • D.method of measuring the knee point voltage from the excitation curve

Answer: B

The transformer under test and a standard of the same nominal ratio carry the same primary current, and the difference between their secondary currents is measured in magnitude and phase. Both a deflection and a null version of the method exist.

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