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Power System

 A simple three-phase power system is shown in Figure 2. Assume that the ratings of the various devices in this system are as follows: 

• Generators G1, G2: 40 MVA, 13.2 kV, = 0.15 pu, = 0.15 pu, = 0.08 

• Generator G3: 60 MVA, 13.8 kV, = 0.20 pu, 0.20 pu, - 0.08

 • Transformers T1, T2, T3, T4: 40 MVA, 13.8/138 kV, X1 = X2 = 0.10 pu, XO 0.08 pu Transformers T5, T6: 30 MVA, 13.8/138 kV, X1 = X2 = 0.10 pu, X0 = 0.08 pu. 

The generator neutrals are connected through a 5% reactance based on the rating of the machine to which it is connected. Zero sequence impedance of the transmission lines is 3 times its positive sequence value. For a single line to ground fault at location C in the system, determine the fault current.

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answered by: Zahidul Hossain
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