The discharge along hydrophobic and hydrophilic surfaces

Conference Record of the the 2002 IEEE International Symposium on Electrical Insulation (Cat. No.02CH37316) Pub Date : 2002-04-07 DOI:10.1109/ELINSL.2002.995931

Z. Jia, Z. Guan

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引用次数: 8

Abstract

HV outdoor insulating systems such as line and station insulators, surge arresters and bushings, using silicone rubbers for external insulation have become very popular. Presently there are two forms of silicone rubbers that are widely used for outdoor HV insulation, namely, high temperature vulcanizing (HTV), used mainly as weather-sheds, and room temperature vulcanizing (RTV), used as a protective coating on a ceramic surface. The driving motivation for their increased use is the unique characteristic of hydrophobicity, which provides a high surface resistance, even in the presence of moisture and contamination, thereby suppressing the leakage current to low values. In this paper, the discharge phenomena along hydrophobic (with RTV coating) and hydrophilic (without RTV coating) surfaces observed with high-speed camera were studied. It is found that there was a clearly difference of discharge activity between along hydrophobic and hydrophilic surfaces. The difference of discharge is explained by means of analyzing the waveforms of the leakage current and flashover voltage.

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沿疏水和亲水表面的放电

高压室外绝缘系统，如线路和站绝缘子，避雷器和套管，使用硅橡胶进行外部绝缘已经变得非常流行。目前广泛用于室外高压绝缘的硅橡胶有两种形式，即高温硫化(HTV)，主要用作雨棚，和室温硫化(RTV)，用作陶瓷表面的保护涂层。其增加使用的驱动动机是疏水性的独特特性，即使在存在水分和污染的情况下，也能提供高表面电阻，从而将泄漏电流抑制到低值。本文研究了用高速摄像机观察到的疏水性(有RTV涂层)和亲水性(无RTV涂层)表面的放电现象。发现沿疏水表面和亲水性表面的放电活性有明显差异。通过对漏电流和闪络电压波形的分析，解释了放电的差异。

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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Conference Record of the the 2002 IEEE International Symposium on Electrical Insulation (Cat. No.02CH37316)

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