7.17 A three-phase short circuit occurs at the generator bus (bus 1) for the system shown in

Figure 7.15. Neglecting prefault currents and assuming that the generator is operating

at its rated voltage, determine the subtransient fault current using superposition.

RE 7.15

em 7.17

G

25 MVA

13:8 kV

15%

bus 1

ww

A

25 MVA

13.2/69 kV

11%

j65 Ω

mm

mmm

bus 2

25 MVA

69/13.2 kV

11%

M

15 MVA

13 kV

15%