Regulation of Surface Charge Accumulation on Epoxy Insulator by Flexible Coating under DC Voltage

2021 International Conference on Electrical Materials and Power Equipment (ICEMPE) Pub Date : 2021-04-11 DOI:10.1109/ICEMPE51623.2021.9509007

Huicun Zhao, Yu Gao, Wenqu Wang, X. Yuan, Huan Wang

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Abstract

Surface charge accumulation on alumina/epoxy insulator affects the safe and reliable operation of the highvoltage direct-current (HVDC) gas insulated transmission line (GIL) and gas insulated switchgear (GIS). In this paper, a flexible coating strategy was proposed to suppress the charge accumulation on the insulator, so as to optimize the electric field distribution. The insulator with multi-arc surface profile and a coaxial electrode system were designed, then surface coatings with various conductivities were deposited on the designated areas of the epoxy insulator by brushing method. The effects of flexible coating on the charge accumulation behavior of the insulator under −15, −20 and −25 kV DC voltages were studied by a kelvin type probe. The results showed that when the metallic wire was adhered on high voltage electrode, the positive charges were accumulated on the nonplanar region in the form of speckles, and the flexible coating could significantly inhibit the charge accumulation on the insulator.

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直流电压下柔性涂层对环氧绝缘子表面电荷积聚的调节

氧化铝/环氧树脂绝缘子表面电荷积累影响高压直流(HVDC)气体绝缘输电线路(GIL)和气体绝缘开关设备(GIS)的安全可靠运行。本文提出了一种柔性涂层策略来抑制绝缘子上的电荷积聚，从而优化电场分布。设计了具有多弧表面轮廓和同轴电极体系的绝缘子，并用涂刷法在环氧绝缘子的指定区域涂覆了不同电导率的表面涂层。用开尔文探针研究了柔性涂层对绝缘子在- 15、- 20和- 25 kV直流电压下电荷积累行为的影响。结果表明:当金属丝粘附在高压电极上时，正电荷以斑点的形式积聚在非平面区域，柔性涂层能显著抑制电荷在绝缘子上的积聚;

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2021 International Conference on Electrical Materials and Power Equipment (ICEMPE)

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