Influence of chemo-rheological properties of silica-filled liquid epoxy resins on partial discharge behavior of coils

A. Kaindl, L. Schoen, H. Borsi
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Abstract

This paper describes the investigation of chemo-rheological properties of silica-filled liquid epoxy resins and its correlation to electrical properties of solid insulation, such as the partial discharge behavior of epoxy resin coils. Results of this investigation show that low viscosity is absolutely essential for a good impregnation of insulation layers. High maximum viscosity values, high surface energy of the resin part as well as filler morphology cause poor impregnation behavior. Optimum partial discharge properties may only be obtained if full impregnation within the insulation layer is achieved. As soon as one single void is left in the insulation, the partial discharge inception voltage drops by a factor of 10. Partial discharge data from the epoxy-resin impregnated coil show a significant improvement upon applying epoxy systems with excellent impregnation characteristics.
二氧化硅填充液态环氧树脂的化学流变性能对线圈局部放电行为的影响
本文研究了二氧化硅填充液态环氧树脂的化学流变性能及其与固体绝缘电学性能的关系,如环氧树脂线圈的局部放电行为。研究结果表明,低粘度对于保温层的良好浸渍是绝对必要的。较高的最大粘度值、树脂部分的高表面能以及填料的形态导致了不良的浸渍行为。只有在绝缘层内实现完全浸渍时,才能获得最佳的局部放电性能。只要在绝缘中留下一个空隙,局部放电开始电压就会下降10倍。环氧树脂浸渍线圈的局部放电数据表明,采用具有优异浸渍特性的环氧树脂体系后,其性能有了显著改善。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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