The one line diagram of a simple three bus power system is shown in figure Each generator is represented by an emf behind the subtraction reactance. All impedances are expressed in per unit on a common MVA base. All resistances and shunt capacitances are neglected. The generators are operating on no load at their rated voltage with their emfs in phase. Athree phase fault occurs at bus 3 through a fault impedance of Zf=j0.19 per unit. a-using thevenin’s theorem obtain the impedance to the point of fault and the fault current in per unit. b-determine the bus voltage and line currents during fault

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The one line diagram of a simple three bus power system is shown in figure

Each generator is represented by an emf behind the subtraction reactance. All impedances are expressed in per unit on a common MVA base. All resistances and shunt capacitances are neglected. The generators are operating on no load at their rated voltage with their emfs in phase. Athree phase fault occurs at bus 3 through a fault impedance of Zf=j0.19 per unit.

a-using thevenin’s theorem obtain the impedance to the point of fault and the fault current in per unit.

b-determine the bus voltage and line currents during fault

j0.
j0.05
j0.075
j0.75
1
j0.30
j0.45
3
Transcribed Image Text:j0. j0.05 j0.075 j0.75 1 j0.30 j0.45 3
The one-line diagram of a simple three-bus power system is shown in Figure
Each generator is represented by an emf behind the subtransient reac-
tance. All impedances are expressed in per unit on a common MVA base. All
resistances and shunt capacitances are neglected. The generators are operat-
ing on no load at their rated voltage with their emfs in phase. A three-phase
fault occurs at bus 3 through a fault impedance of Zf = j0.19 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.
j0.05
j0.075
j0.75
1
j0.30
j0.45
3
Transcribed Image Text:The one-line diagram of a simple three-bus power system is shown in Figure Each generator is represented by an emf behind the subtransient reac- tance. All impedances are expressed in per unit on a common MVA base. All resistances and shunt capacitances are neglected. The generators are operat- ing on no load at their rated voltage with their emfs in phase. A three-phase fault occurs at bus 3 through a fault impedance of Zf = j0.19 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. j0.05 j0.075 j0.75 1 j0.30 j0.45 3
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