1) Consider the power system shown in Fig. 1. Use a power base of 500 MVA...

Question:

1) Consider the power system shown in Fig. 1. Use a power base of 500 MVA to calculate the fault current in amperes for a double line-to-ground fault at bus B. G: 500 MVA, 13.8 kv, xa = 0.2 p.M., X2 = 0.2 p.j. and x = 0.1 p.u. G2:600 MVA, 26 kv, xa = 0.15 p.u., X2 = 0.15 p.u. and X, = 0.1 p.u. G3:400 MVA, 13.8 kv, x, = 0.2 p.u., x2 = 0.2 p.u. and x = 0.1 p.u. T: 500 MVA, 13.8 kv/500 kv, x = 0.1 p.u. T2 :600 MVA, 26 kv/500 kv, x = 0.1 p.u. Tz: 500 MVA, 13.8 kv/500 kv, x = 0.1 p.u. Line AB, X; = 502 Line BC, X = 80 22 For transmission lines: Xo = 3x Fig. 1

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