A 50 KVA, 2300/230 V, 60 Hz transformer has a high voltage winding resistance of 0.65...

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A 50 KVA, 2300/230 V, 60 Hz transformer has a high voltage winding resistance of 0.65 2 and a low-voltage winding resistance of 0.0065 2. Laboratory tests showed the following results: Open circuit test: V = 230 V, I=5.7A, P = 190 W Short circuit test: V=41.5 V, I-21.7 A, P-No wattmeter was used. (a) Compute the value of primary voltage needed to give rated secondary voltage when the transformer is connected as a step-up one and is delivening 50 KVA at a power factor of 0.8 lagging. (12) (b) Compute the efficiency under conditions of part (a). (4) A 50 KVA, 2300/230 V, 60 Hz transformer has a high voltage winding resistance of 0.65 2 and a low-voltage winding resistance of 0.0065 2. Laboratory tests showed the following results: Open circuit test: V = 230 V, I=5.7A, P = 190 W Short circuit test: V=41.5 V, I-21.7 A, P-No wattmeter was used. (a) Compute the value of primary voltage needed to give rated secondary voltage when the transformer is connected as a step-up one and is delivening 50 KVA at a power factor of 0.8 lagging. (12) (b) Compute the efficiency under conditions of part (a). (4)

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