Consider the single-line diagram of a power system shown

Chapter , Problem 349

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Consider the single-line diagram of a power system shown in Figure 3.42 with equipment ratings given below: Generator G1: 50 MVA, 13.2 kV, x = 0:15 ru Generator G2: 20 MVA, 13.8 kV, x = 0:15 ru three-phase DY transformer T1: 80 MVA, 13.2 D/165 Y kV, X = 0:1 ru three-phase YD transformer T2: 40 MVA, 165 Y/13.8 D kV, X = 0:1 ru Load: 40 MVA, 0.8 PF lagging, operating at 150 kV Choose a base of 100 MVA for the system and 132-kV base in the transmission-line circuit. Let the load be modeled as a parallel combination of resistance and inductance. Neglect transformer phase shifts. Draw a per-phase equivalent circuit of the system showing all impedances in per unit.

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