Question & Answer: Three zones of a single-phase circuit are identified in Fig. 1. The zones are connected by transformers (T1 and T2), ratings…..

Three zones of a single-phase circuit are identified in Fig. 1. The zones are connected by transformers (T1 and T2), ratings are also shown in Fig. 1. Using base values of 40 kVA and 240 V in zone 1, draw the per unit circuit and determine the per unit impedances and the per unit source voltage. Then calculate the load current both in per unit and in amperes. Repeat the calculation for 50 kVA and 250 V base values. Note: Transformer winding resistances and shunt admittance branches are neglected.