Fabrication and PD-initiated Breakdown of Simulated Mica Tape Insulation Containing Epoxy Nanocomposites

T. Iizuka, Xuping Liu, Jun Mai, K. Tatsumi, Toshikatsu Tanaka, T. Mabuchi, Xiaohong Yin, T. Umemoto, H. Muto
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Abstract

Mica epoxy insulation as used for generator stator windings is required to be improved as regards withstand electrical stress and heat dissipation. Replacement of epoxy resins by epoxy nanocomposites is a useful method to fulfil a purpose of such improvement. This paper is aimed to evaluate PD-initiated breakdown (BD) performances as one of the most crucial characteristics using simulated model specimens. Two constituent materials, i.e. mica tapes and resin layers were set as about 40 and 10 µm in thickness, respectively. EDX analysis shows that the model specimens include silica nanofillers properly dispersed in narrow nanocomposite regions and are suitable for PD initiated BD experiments. It was found that PD initiated BD lifetime was 2.8 times in nanocomposites than in neat epoxy under a rather high electric stress condition.
含环氧纳米复合材料模拟云母带绝缘的制备及pd引发击穿
用于发电机定子绕组的云母环氧绝缘要求在耐电应力和散热方面得到改进。用环氧纳米复合材料代替环氧树脂是实现这一目的的有效方法。本文旨在通过模拟模型样品来评估pd引发击穿(BD)性能作为最重要的特性之一。云母带和树脂层两种组成材料的厚度分别约为40µm和10µm。EDX分析表明,模型试样中含有二氧化硅纳米填料,适当地分散在纳米复合材料的狭窄区域,适合PD引发的BD实验。结果表明,在较高的电应力条件下,纳米复合材料的PD引发BD寿命是纯环氧树脂的2.8倍。
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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