As shown in Figure 7.21, a 25-MVA, 13.8-kV, 60-Hz
Chapter , Problem 7.34(choose chapter or problem)
As shown in Figure 7.21, a 25-MVA, 13.8-kV, 60-Hz synchronous generator with Xd 00 _ 0:15 per unit is connected through a transformer to a bus that supplies four identical motors. The rating of the three-phase transformer is 25 MVA, 13.8/6.9 kV, with a leakage reactance of 0.1 per unit. Each motor has a subtransient reactance Xd 00 _ 0:2 per unit on a base of 5 MVA and 6.9 kV. A three-phase fault occurs at point P, when the bus voltage at the motors is 6.9 kV. Determine: (a) the subtransient fault current, (b) the subtransient current through breaker A, (c) the symmetrical short-circuit interrupting current (as defined for circuit breaker applications) in the fault and in breaker A.
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