Discussion
Partial discharge measurement on a machine winding detects
Answer: B
Correct answer: small discharges in voids within the insulation
A void within the insulation sees a higher stress than the surrounding material and breaks down repeatedly at a fraction of the applied voltage, each event a nanosecond pulse of a few picocoulombs. The discharges progressively erode the surrounding insulation, so measuring them detects deterioration long before any test of resistance or withstand would.
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