Study on Icing and Contamination Flashover Characteristics and Critical Flashover Current of Composite Insulators

doi:10.11930/j.issn.1004-9649.201801061

Abstract

Abstract: The electrical characteristics of the insulators are one of the key parameters for the design of the external insulation of the transmission lines. Insulator critical flashover current plays an important role in condition assessment and flashover warning for insulators. In this paper, the artificial pollution test and artificial icing test of the FXBW-110/100 composite insulators are carried out in the artificial climate chamber. The test results show that the contamination flashover voltage and icing flashover voltage of composite insulator decrease with the increase of salt density on the surface of the insulator, which can be fitted as the exponential expression. The fitting parameters of the exponential expression under contamination condition with and without ice are almost same. Therefore, the icing condition can be considered as a special form of pollution condition. The flashover voltage of the insulators with icing is lower than that of the insulators without icing under the same pollution conditions. The flashover voltage decreases with the increasing of the thickness of icing layer on the insulator. The critical flashover current of icing and contamination composite insulators increases with the increase of SDD. The relationship can be fitted as exponential expression under the same pollution conditions, the critical flashover current(Ic) of ice covered insulators is larger than that without icing.

Key words: composite insulator, contamination flashover, icing flashover, critical flashover current, insulation coordination

CLC Number:

TM853

WU Gaolin, ZHOU Qing, XIAO Qianbo, HU Jianlin, BI Maoqiang. Study on Icing and Contamination Flashover Characteristics and Critical Flashover Current of Composite Insulators[J]. Electric Power, 2019, 52(4): 59-65.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.201801061

https://www.electricpower.com.cn/EN/Y2019/V52/I4/59

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