Influence of H2O molecules on electrical tree initiation in silicone rubber

2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 2011-10-01 DOI:10.1109/CEIDP.2011.6232773

S. Muroga, Y. Muramoto, N. Shimizu

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引用次数: 3

Abstract

Silicone rubber (SiR) has various excellent characteristics, and is widely used in various apparatus as insulating material. However, tree initiation processes and degradation phenomena in SiR are not clear. The investigations of tree initiation processes at high electric field region are very important. In this paper, the effect of H2O on electrical tree initiation voltage will be examined. Three kinds of samples were tested; untreated SiR, SiR treated by vacuum heating, and SiR impregnated with liquid water after vacuum heating treatment. The tree initiation voltage of SiR treated by vacuum heating was higher than that of untreated SiR. It is considered that the tree initiation voltage is increased by removing gaseous H2O molecules. However the tree initiation voltage of SiR impregnated with liquid water after vacuum heating was higher than that of SiR treated by vacuum heating. These results seem to contradict each other. We consider that the tree initiation voltage is increased by presence of liquid H2O. It is suggested that the states of H2O molecules included in the free volume have a large effect on ac tree initiation in SiR.

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水分子对硅橡胶中电树起始的影响

硅橡胶(SiR)具有各种优异的性能，广泛用作各种仪器的绝缘材料。然而，SiR树的起始过程和降解现象尚不清楚。研究树在高电场区域的起始过程是非常重要的。本文将研究水对电树起始电压的影响。测试了三种样品;未处理SiR、真空加热SiR和真空加热后浸渍液态水SiR。真空加热处理SiR的树状起始电压高于未处理SiR的树状起始电压。可以认为，树状起始电压是通过去除气态H2O分子而提高的。真空加热后，液态水浸渍SiR的起始电压高于真空加热SiR。这些结果似乎相互矛盾。我们认为液态水的存在增加了树的起始电压。结果表明，自由体积中包含的H2O分子的状态对SiR中ac树的起始有很大影响。

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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2011 Annual Report Conference on Electrical Insulation and Dielectric Phenomena

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