Question 5 Equipment rating for the four-bus system in figure below are as follows: Generator G1: 500MVA, 13.8 kV, X" = 0.20pu Generator G2: 750MVA, 18KV, X" = 0.18pu Generator G3: 1000MVA, 20kv, X" =...

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Extracted text: Question 5 Equipment rating for the four-bus system in figure below are as follows: Generator G1: 500MVA, 13.8 kV, X" = 0.20pu Generator G2: 750MVA, 18KV, X" = 0.18pu Generator G3: 1000MVA, 20kv, X" = 0.17 pu Transformer T1: 500MVA, 13.8A/500Y kV, X = 0.12 pu Transformer T2: 750MVA, 18A/500 Y kV, X = 0.10 pu Transformer T3: 1000MVA, 20A/500Y kV, X = 0.10 pu Each 500kV line: X1 =502 A three phase short circuit occurs at bus 1, where the pre-fault voltage is 525kV. Pre-fault load current is neglected. T1 T3 G1 G3 1 2 3 j50 2 j50 2 ΔΥ j50 2 YA 4 T2 G2 Figure 4 a) Determine the Thevenin reactance in per unit at the fault. b) Determine the sub transient fault current in per unit and kA rms. E ma