Question
Calculate the per-unit, subtransient fault currents for:
a) a bolted single line to ground short circuit from from phase to a ground at bus 3. Also calculate the per-unit line to ground voltages at faulted bus 3, and the line currents.
b) a bolted line to line fault from phase b to c at bus 3. Also calculate the per-unit line to ground voltages at faulted bus 3.
c) a bolted double lime to ground from phase b to c to ground at bus 3. Also calculate the per-unit line to ground voltages at bus 1.
d) a bolted three-phase to ground fault at bus 2.
Assume an unloaded system (pre-fault current = 0) where all machines operate at 1.05pu

EDEMPLO (a) J.1 J.15p 2
0 0
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