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Consider a power system as shown in the Figure below. The manufacturers data, the line and load details are indicated in the Table below. Transmission lines 1 and 2 have impedances of 150 and 120 respectively. By choosing a common base of 120 MVA and 11 kV on the generators side, determine: 9 all the reactances in per unit and draw the reactance diagram. b. If the motor M operates at 80 MVA at 0.9 pf leading at a terminal voltage of 10.5 kV and the load is 70 MVA at 0.6 p.f. lagging, determine the Bus 1 voltage.

Fig: 1

Fig: 2

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Fig: 5