Equipment ratings for the five-bus power system shown below are as follows:
Generator G1: 50 MVA, 12 kV, X" = 0.2 per unit
Generator G2: 100 MVA, 15 kV, X" = 0.2 per unit
Transformer T l: 50 MVA, 10 kV Y/138 kV Y, X = 0.10 per unit
Transformer T2: 100 MVA, 15 kV Δ/138 kV Y, X = 0.10 per unit
Each 138-kV line: X1= 40 Ω
A three-phase short circuit occurs at bus 5, where the pre-fault voltage is 15 kV. Pre-fault load current is neglected.
(a) Draw the positive sequence reactance diagram in per-unit on a 100 MVA, 15-kV base in the zone of generator G2. Determine: (b) the Thevenin equivalent at the fault, (c) the subtransient fault current in per unit and in kA rms, and (d) contributions to the fault from generator G2 and from transformer T2.
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