Hydrophobicity and Flashover Characteristics  Analysis of Various Types of RTV

doi:10.3969/j.issn.1000-7229.2015.05.008

Abstract

Abstract:

Room temperature vulcanized silicone rubber （RTV） has good antifouling properties, which has been widely used in the power system, but different types of RTV coatings antifouling performances are unlike. Static contact angle of different RTV coatings were determined and the hydrophobicity recovery properties after pollution flashover and AC/DC flashover characteristics were tested and analyzed. The test results show that the hydrophobicity of long-acting RTV coating （P-RTV） is stronger than that of high self-cleaning RTV coating （S-RTV）； and under the same pollution degree, the pollution flashover voltage of P-RTV is higher than that of S-RTV, which shows stronger hydrophobicity means higher antifouling performance. In addition, surface flashover can cause the temporary loss of P-RTV hydrophobicity, which will lead flashover voltage amplitude decreasing 11.1 %-21.1%, while the loss of S-RTV coatings hydrophobicity is unrecoverable. The surfaces of RTV coatings all have burning marks in varying degrees distributed on the lower surface of the insulator connected with the high voltage, which is one of the factors causing anti-pollution performance decreasing. And the signs of burning on RTV surface are more obvious under DC voltage； its dielectric tracking performance is poor. Moreover, the comprehensive performance of P-RTV is better than that of S-RTV, so the priority of actual application should be given to P-RTV. The result has a certain guiding significance to the development and use of RTV coatings.

Key words: insulator, RTV coating, static contact angle, hydrophobicity, pollution flashover voltage, leakage current

CLC Number:

TM 216

HUANG Qingdan, YOU Jinwei, SONG Haoyong, WU Peiwei, ZHANG Zhijin, JIANG Xingliang. Hydrophobicity and Flashover Characteristics Analysis of Various Types of RTV[J]. ELECTRIC POWER CONSTRUCTION, 2015, 36(5): 45-51.

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Hydrophobicity and Flashover Characteristics Analysis of Various Types of RTV

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