Discussion
Match the reactance with the period it governs after a sudden short circuit.
1. Subtransient 2. Transient 3. Synchronous
P. The sustained condition Q. The first few cycles R. The following second or so
Answer: C
Flux trapped first in the damper winding and then in the field winding gives the two shorter periods, and once all the trapped currents have decayed the synchronous value applies. Switchgear making capacity is set by the first.
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