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The stator motor windings of low voltage rotating electrical machines are usually insulated by organic enamel. When the motors are supplied by power electronic converters, the stator insulation system is subjected to different voltage waveforms such as PWM. Due to reflection phenomena, overvoltage can be associated to pulsed waveforms and partial discharge (PD) activity can incept leading to the insulating...
The stator motor windings of low voltage rotating electrical machines are usually insulated by organic enamel. When the motors are supplied by power electronic converters, the stator insulation system is subjected to pulsed voltage waveform and a fast degradation of the insulating system could occur. In fact, it is possible that partial discharge (PD) activity incepts leading to the deterioration...
Several electrical aging tests have been carried out on twisted pair specimens prepared by winding wires having conventional or nanostructured enamel insulation. The conventional enamel is polyamide-imide, while the nanostructured enamel is a polyamide imide - silica nanocomposite. The tests have been performed applying sinusoidal voltage at two different frequencies. The partial discharge (PD) signals...
This investigation is dedicated to the development of a new class of nanostructured composite material from cycloaliphatic epoxy polymers with nanoclay and microsilica as the fillers and the analysis of the behavior associated in the inclined plane tracking test (IEC 60587). Composite materials with different weight percentages of fillers were prepared and subjected to electrical tracking according...
This work concerns the comparison between the behaviour of winding wires insulated by a conventional organic enamel or by a nanocomposite enamel, when subjected to the action of surface partial discharges. Some aging tests were carried out applying a 1500 Hz sinusoidal voltage with different amplitudes. The outcome was summarized through lifetime plots. During the tests, partial discharges (PD) patterns...
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