A three-phase short circuit occurs at the generator bus (bus 1) for the system shown in Figure 7.17. Neglecting prefault currents and assuming that the generator is operating at its rated voltage, determine the subtransient fault current using superposition.

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G bus 1 25 MVA 13.8 kV 15% A 25 MVA 13.2/69 kV 11% 165 mm. AYI 25 MVA 69/13.2 kV 11% bus 2 to M 15 MVA 13 kV 15%