Discussion
A surge comparison test on a machine winding detects
Answer: A
Correct answer: turn-to-turn faults by comparing the responses of two phases
A steep-fronted surge is applied to two nominally identical windings and their waveforms superimposed. Identical windings give identical traces; a single shorted turn changes the inductance enough to separate them visibly. This is one of the few tests that finds a turn-to-turn fault, which a resistance or insulation measurement will miss entirely.
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