局部放电作用对变频电机匝间纳米复合绝缘的损伤机理研究

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Abstract Partial discharge(PD) under a sequence of high-frequency pulse is one of the key factors which lead to premature failure of turn insulation of inverter-fed motors. Aging experiments for turn insulation samples under bipolar continuous square impulse voltage were done. The number and mean quantity of PDs under impulse voltage were studied. By means of scanning electron microscope (SEM), the microcosmic morphologies of surface of turn insulation were analyzed. The results reveal that the relationship of PD parameters(PD number and mean PD amplitude value) between aging time is complicated. The damage of polyimide nano-composite film is concentrated on the degradation of polymer matrix in the presence of PDs. The residual nano-fillers remain on the surface and form an inorganic insulation layer to resist the further damage of PDs. It is the symbol of faults expanding rapidly when the floccules and voids form on the surface, which leads insulation failure.

Key words： Inverter-fed motor turn insulation nano-composite partial discharge(PD) microcosmic morphology aging

Received: 16 April 2013 Published: 05 November 2014

PACS:	TM215.3
	TM851

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