9.3. The one-line diagram of a simple power system is shown in Figure 69. Each generator is represented by an emf behind the transient reactance. All impedances are expressed in per unit on a common MVA base. All resistances and shunt ca- pacitances are neglected. The generators are operating on no load at their rated voltage with their emfs in phase. A three-phase fault occurs at bus 1 through a fault impedance of Zj0.08 per unit. (a) Using Thévenin's theorem obtain the impedance to the point of fault and the fault current in per unit. (b) Determine the bus voltages and line currents during fault. 3 X=0.1 1 X=0.1 30+ XL = 0.2 2 oto X = 0.1