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7.06 A 50 HP 220-volt 3-phase induction motor has a pf of 80% lagging and efficiency of 90% when working at full load. It is to get power from 2,300 volt 3-phase line through three transformers connected delta-wye. Determine: (a) the required ratio, and, (b) KVA of the three single phase transformers. Ans. 18.1, 17.27 KVA 17.08 Given: 11 450 A. 200 PRI SEC PF =0.866 lag * Ig=300 A 200v PF 100%. Reference vector: Vab Phase sequence: acb Required: Current and KW of secondary ca. Ans. 316.22-131.56°; 30.96 KW 200v 100v 100v 100v L
7.06 A 50 HP 220-volt 3-phase induction motor has a pf of 80% lagging and efficiency of 90% when working at full load. It is to get power from 2,300 volt 3-phase line through three transformers connected delta-wye. Determine: (a) the required ratio, and, (b) KVA of the three single phase transformers. Ans. 18.1, 17.27 KVA 17.08 Given: 11 450 A. 200 PRI SEC PF =0.866 lag * Ig=300 A 200v PF 100%. Reference vector: Vab Phase sequence: acb Required: Current and KW of secondary ca. Ans. 316.22-131.56°; 30.96 KW 200v 100v 100v 100v L