A 30 kVA, 11k/380 V, single-phase transformer has the following test results: Open-circuit test (measured from low-voltage side): Voc = 380 V, loc=1.75 A, Poc = 100 W Short-circuit test (measured from high-voltage side): Vsc225 V, Isc=2.5 A, Psc = 150 W (b) (a) Determine the approximate equivalent circuit parameters of the transformer in per-unit. If the transformer supplies 90% full load at (0.8 +0.01B) power factor at its rated voltage, calculate the secondary current at this working condition in both actual and per-unit values. (If B is an odd number, the power factor is lagging; otherwise, the power factor is leading.) Compute the efficiency and voltage regulation of the transformer under this condition by usirg per-unit values. (c)