复合绝缘子弱憎水性状态描述方法Ⅰ——静态接触角法的适用性

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Abstract Static contact angle is the most commonly used parameter in the laboratory for studying hydrophobic properties of silicone rubber. Usability of contact angle method has been proved on clean materials with good hydrophobicity. This paper aims to discuss the applicability of contact angle method on polluted high temperature vulcanizing silicone rubber(HTV) samples when the hydrophobicity is unobvious. Unobvious hydrophobic state reflects the migration process of low molecular weight components(LMW), corresponding to the transitional period of dirty layer from absolutely hydrophilic state to strong hydrophobic state. To find building the link between hydrophobicity strength and flashover voltage, morphology change of different type and volume droplets on pollution layer were studied. As the following factors’ function, such as the roughness of surface, uneven distribution of hydrophobicity on the surface and the way of measuring contact angle, it is difficult to obtain a valid contact angle to represent the hydrophobicity of whole surface when the hydrophobicity of pollution layer is unobvious. Contact angle method becomes no longer suitable for studying hydrophobicity properties when the hydrophobicity of pollution layer is unobvious

Key words： Unobvious hydrophobicity contact angle silicone rubber artificial pollution flashover voltage

Received: 14 January 2013 Published: 25 March 2014

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TM21

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	Articles by authors
	Dai Hanqi
	Mei Hongwei
	Wang Liming
	Zhao Chenlong
	Jia Zhidong
	Guan Zhicheng

Cite this article:

Dai Hanqi,Mei Hongwei,Wang Liming等. Description Method Ⅰfor Unobvious Hydrophobic State of Composite Insulators—Usability of Contact Angle Method[J]. Transactions of China Electrotechnical Society, 2013, 28(8): 34-47.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2013/V28/I8/34

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