Discussion
A sudden short circuit test on a large alternator is carried out to determine
Answer: C
Correct answer: the subtransient and transient reactances and their time constants
Applying a short circuit to an unloaded machine and recording the current envelope reveals the whole decay: the very large initial current governed by the subtransient reactance, its decay to the transient value as the damper currents die away, and finally the steady state. These parameters are what the power system’s fault studies and protection settings depend on.
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