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Reliability of inverter-fed motors depends upon partial discharge (PD) behavior of stator windings. A new measuring system of PD inception voltage (PDIV) was developed with repetitive impulses which simulate turn-to-turn voltage of the motors. Using the system, PDIV was measured repeatedly on twisted-pairs of magnet wires. With bipolar repetitive impulses PDIV fluctuated with large scatterings in...
Partial discharge inception voltage (PDIV) of twisted pair under repetitive bipolar impulse voltage was found to fluctuate as PDIV measurements repeat. In this paper the discharge location is observed to each PDIV measurement using high-sensitive CCD camera just after PD inception. The result shows the PD location changes as measurements repeats; discharge occurs in a whole air gap between two wires...
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