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The open circuit test gives

  • A.the voltage regulation at full load directly
  • B.the core loss and the magnetising branch parameters
  • C.the copper loss and the series impedance of the windings
  • D.the temperature rise of the transformer under load

Answer: B

Correct answer: the core loss and the magnetising branch parameters

With the secondary open, the only current drawn is the small no-load current, so the copper loss is negligible and the wattmeter reads the core loss. Voltage, current and power together give the magnetising branch: the conductance representing the core loss and the susceptance representing the magnetising current.

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