Contamination Accumulating Features of Composite Insulator of ±500 kV Xingren-Baoan HVDC Transmission Line

doi:10.11930/j.issn.10.11930.2015.8.86

Abstract

Abstract: Under the influence of electrostatic dust collection effect, the insulator contamination of HVDC transmission line is heavier than that of HVAC and has a higher risk of pollution flashover. Study of the contamination features of insulators for DC transmission line is conducive to the external insulation configuration of power system as well as the prevention and control of pollution flashover, and can also ensure the safety operation of power system. This paper investigates the contamination features of insulators by collecting the contamination on the surface of composite insulators of ±500 kV Xingren-Baoan DC transmission line and by testing the ESDD under the laboratory environment. The experimental results show that the contamination on the surface of composite insulators of ±500 kV Xingren-Baoan HVDC transmission line is relatively light and the ESDD is below 0.025 mg/cm2; the contamination on the surface of insulators is influenced by the local pollution sources and the DC polarity has no effect on the contamination of insulator strings. The ESDD on the surface of composite insulator string appears U-shaped curve, and 63% of the sample’s ESDD in the upper surface is greater than that in the lower surface and the small insulator sheds have the worst polluted condition among different insulator sheds arrangement modes. Obvious differences are observed between DC and AC transmission lines in contamination features of composite insulators.

Key words: DC, composite insulator, contamination, pollution flashover, ESDD

CLC Number:

TM853

ZHENG Qiuwei, LIU Huagang, ZHOU Jianming, YANG Shuai, YU Jianhui, ZHOU Wenjun. Contamination Accumulating Features of Composite Insulator of ±500 kV Xingren-Baoan HVDC Transmission Line[J]. journal1, 2015, 48(8): 86-91.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.10.11930.2015.8.86

https://www.electricpower.com.cn/EN/Y2015/V48/I8/86

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