Q. A 20-kVA, 2200:220-V, 60-Hz, single-phase transformer has these parameters:
Resistance of the 2200-V winding R1 = 2.50
Resistance of the 220-V winding R2 = 0.03
Leakage reactance of the 2200-V winding X1 =0.1
Leakage reactance of the 220-V winding X2 = 0.1
Magnetizing reactance on the 2200-V sideXm = 25,000
(a) Draw the equivalent circuits of the transformer referred to the high-voltage and low voltage sides. Label impedances numerically in ohms.
(b) The transformer is supplying 15 kVA at 220 V and a lagging power factor of 0.85. Determine the required voltage at the high-voltage terminals of the transformer.