Question

Determine the transformer equivalent circuit components referred to the LV side and sketch the equivalent circuit....

Determine the transformer equivalent circuit components referred to the LV side and sketch the equivalent circuit. Calculate the transformer voltage regulation at full load with load power factor of 0.9 lagging.

Below is the test result which can be used to determine the value of the components for the equivalent circuit.

Power of the transformer = 1 kVA

Open circuit test:

LV winding Voltage = 110 V

LV side ammeter = 690 mA

LV side wattmeter = 18 W

HV side voltmeter = 222.2 V

Short circuit test:

HV side ammeter = 4.44 mA

HV side voltmeter = 14.4 V

HV side wattmeter = 61.30 W

LV side Ammeter = 8.7 A

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