Discussion
Before a generator is connected in parallel with a live busbar, four conditions must be matched:
Answer: C
Correct answer: voltage, frequency, phase sequence and phase angle
All four must match before the switch is closed. A mismatch in any of them puts a difference voltage across the machine’s own small impedance and draws a large current, and a wrong phase sequence in particular can wreck the machine and its coupling. Synchroscopes and check-synchronising relays exist to enforce exactly these four conditions.
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