Problem 7 A 15-KVA, 2300/230-V transformer is to be tested to determine its excitation branch components, its series impedances, and its voltage regulation. The following test data have been taken from the primary side of the transformer: Open circuit test: Voc = 2300 V, Ioc = 0.21 A, Poc = 50 W Short circuit test: Vsc = 47 V, Isc = 6.0 A, Psc SC = 160 W a) Find the equivalent circuit of this transformer referred to the high voltage side. b) Find the equivalent circuit of this transformer referred to the low voltage side. c) Calculate the voltage regulation when the transformer delivers rated load at 0.8 lagging power factor, 1.0 power factor, and at 0.8 leading power factor at rated voltage. d) What is the efficiency of the transformer at full load with a power factor of 0.8 lagging? e) Find the loading at the maximum efficiency and the maximum efficiency at 0.8 power factor lagging.