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This work describes an investigation about the influence of two service parameter on the PD inception voltage threshold of type I random wire wound stator insulation; the temperature and the voltage gradient (i.e. the rise time). An experimental campaign of PD inception tests was carried out on twisted pair specimens applying unipolar voltage pulses having different rise time. The results have been...
Partial discharge (PD) endurance test was performed on twisted pair specimens of enameled wires consisting of polyamide-imide resin with nanometer-size fillers. Specimens were prepared with containing nanometer-scale silica or titania fillers, as well as specimens without fillers. In the PD endurance test, so-called V-t characteristics of the twisted pair specimen were measured by applying a constant...
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