Discussion
True or false: a generator can be connected to a live busbar whenever its voltage matches.
Answer: C
Correct answer: False, since frequency, phase sequence and phase angle must match as well
Matching the voltage magnitude alone leaves three other ways to be wrong. A frequency error means the phase relation is drifting, a phase angle error puts a difference voltage across the machine at the instant of closing, and a sequence error is worst of all - the machine is thrown against a field turning the wrong way.
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