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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 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...
This paper presents the outcome of a partial discharge test campaign performed on random wire wound stator insulation of electrical motors. The test campaign was carried out in the frame of a rewinding program involving some units that experienced early failures due to insulation breakdown. The cause of the early failures was targeted to the pollution of the motors due to the harsh environment. Besides...
Partial discharge (PD) pattern recognition and interpretation is still often the key to assess the presence and the nature of defects inside electrical insulation. In the case of external PD source, as when surface partial discharges are concerned, the PD pattern can be strongly influenced by the environmental conditions. This work presents the experimental outcome of a PD measurement campaign performed...
Nanocomposite materials show promising results for applications as electrical insulation. Among several materials presently under investigation, previous works indicate that polypropylene and ethylene-vinilacetate filled by nanosilicates present lower content of space charge and higher electric strength. However, efforts are needed to explain nanocomposite behaviour and characterize their electrical,...
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