PROBLEM
A 10000 kVA, 13.8 kV three phase alternator connected through a 5 cycle oil circuit breaker has sub-transient reactance, transient reactance and synchronous reactance of 0.09 p.u, 0.15 p.u and 1 p.u respectively. It is running on load with rated voltage develop across the terminals when three phase symmetrical short circuit occurs just beyond the CB. Determine: (1) the sustained short circuit current[M1] in the CB (2) the initial symmetrical rms current (3) the maximum possible d.c. component of the short circuit current (4) the momentary current rating of the CB (5) the current to be interrupted by the breaker and (6) interrupting capacity in MVA.
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