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Discussion

The short circuit test gives

  • A.the no-load current and its power factor
  • B.the all-day efficiency of the transformer
  • C.the copper loss and the series impedance
  • D.the core loss and the magnetising branch parameters

Answer: C

Rated current at a small flux isolates the winding resistance and leakage reactance and excludes the core loss. Together with the open circuit test it completes the equivalent circuit without ever loading the transformer fully.

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