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Considering the great importance of the degradation phenomena acting on the insulating materials of the inductor motor windings supplied by inverter drives based on IGBT the behaviour of different kinds of insulating organic enamels have been investigated. During the research activity, twisted pair specimens have been realized and subjected to severe voltage waveforms having peak to peak amplitudes...
Low voltage stator windings of electrical machines are often realized by means of wires insulated by organic enamel. This kind of enamel can be subjected to partial discharges (PD) activity that could lead to breakdown condition the electrical insulating system so that the life time could be shorter than the expected one. In this research work, twisted pair specimens insulated by non corona resistant...
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...
Polymeric nanocomposite materials have shown a big potential for an impact in wire wound rotating machine stator insulation. Small wire wound machines, in fact, have a mainly organic stator winding insulation which is easily degraded by partial discharge (PD) activity. In this kind of equipment, then, the presence of PD activity leads to failure in a very short time. Nanofilled polymeric materials,...
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