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Engineering · Electrical Engineering
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A single-line diagram of a threo-phase power station is shown in Fig, 353. The ratings of the equipment are shown below. 3.15 Generator Gi: 100 MVA, 11 kV, X-X2 = 0.24 pu, Xo = 0.06 pu Generator Gr 100 MVA, 20 kV, X,-Xy= 0.22 pu, X-0.03p, x,=0.05 pu Generator G3: 100 MVA, 20 kV, X,-X, = 0.35 pu, X。= 0.07 pu Transforme. Ti: 100 MVA, l 1/66 kV, Δ-Y, Xi = X2 = Xo = 0.06 pu Bus4 Fig 3.53 A single-line diagram of a power system 1, △Y/ Bus 2 Bus 3 GT Bus 5 Bus 6 Exercise Problems 151 Transformer T: 100 MVA, 2066 kV, both sides carthed Y Y. xi-x Xo 0.06 pu Transformer T: 100 MVA, 20/66 kV. Y-Y, X, X2 Xo 0.04pu Line I: 100 MVAX, X -0.15 pu, Xo 0.65 pu Line 2: 100 MVA XX 0.10 pu, Xo 0.45 pu Linc 3: 100 MVA.X,X 0.16pu, Xo 0.65 pu Find the fault cuments in each of single linc-to-ground, linc-line and double linc-to-ground faults ceeurring at bus 5
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