Voltage Current A 5 kVA, 200/400 V, 50 Hz single-phase transformer gave the following results: Measurement...

 

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Voltage Current A 5 kVA, 200/400 V, 50 Hz single-phase transformer gave the following results: Measurement side Power O/C test 200 V 0.7 A 60 W low voltage side S/C test 22 V 16 A 120 W high voltage side Calculate: a. the equivalent resistance and reactance referred to low voltage side; b. the voltage regulation at full load and 0.9 power factor lagging; [5] [4] c. the load which gives maximum efficiency at unity power factor; d. the efficiency at unity power factor. [4] [2] Voltage Current A 5 kVA, 200/400 V, 50 Hz single-phase transformer gave the following results: Measurement side Power O/C test 200 V 0.7 A 60 W low voltage side S/C test 22 V 16 A 120 W high voltage side Calculate: a. the equivalent resistance and reactance referred to low voltage side; b. the voltage regulation at full load and 0.9 power factor lagging; [5] [4] c. the load which gives maximum efficiency at unity power factor; d. the efficiency at unity power factor. [4] [2]