Three single-phase two-winding transformers, each rated 3
Chapter , Problem 3.56(choose chapter or problem)
Three single-phase two-winding transformers, each rated 3 kVA, 220/110 volts, 60 Hz, with a 0.10 per-unit leakage reactance, are connected as a three-phase extended D autotransformer bank, as shown in Figure 3.31(c). The low-voltage D winding has a 110 volt rating. (a) Draw the positive- sequence phasor diagram and show that the highvoltage winding has a 479.5 volt rating. (b) A three- phase load connected to the low voltage terminals absorbs 6 kW at 110 volts and at 0.8 power factor lagging. Draw the per-unit impedance diagram and calculate the voltage and current at the high- voltage terminals. Assume positive-sequence operation.
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