As shown in figure a 25-mva 138-kv 60-hz synchronous, Ask an Expert

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As shown in Figure, a 25-MVA, 13.8-kV, 60-Hz synchronous generator with X"_d = 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 X_d" = 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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Category:- Other Engineering
Reference No.:- M91897084

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