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3.17. The one-line diagram of a three-phase power system is as shown in Figure3.36. The transformer reactance is 20 percent on a base of 100 MVA, 23/115kV and the line

impedance is Z = j66.125N. The load at bus 2 is Sz = 184.8MW +j6.6 Mvar, and at bus 3 is S3 = 0 MW +j20 Mvar. It is required tohold the voltage at bus 3 at 115/0° kV. Working in per-unit, determine thevoltage at buses 2 and 1.

Fig: 1

Fig: 2