Surface Charge Accumulation Characteristic on GIL Three-pillar Insulator

LI Weiguo; ZHANG Changhong; YANG Xu; LI Mingyang; QI Bo; GAO Chunjia

doi:10.13296/j.1001-1609.hva.2025.01.022

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Surface Charge Accumulation Characteristic on GIL Three-pillar Insulator

Research & Analysis | 更新时间：2025-04-26

- Surface Charge Accumulation Characteristic on GIL Three-pillar Insulator
- High Voltage Apparatus Vol. 61, Issue 1, Pages: 189-196(2025)
- 作者机构：
  
  1.南方电网超高压输电公司检修试验中心，广州　 510663
  2.华北电力大学新能源电力系统国家重点实验室，北京　 102206
- 作者简介：
- 基金信息：
  
  Smart Gird-national Science and Technology Major Project (2030)(2024ZD0802400)
- DOI：10.13296/j.1001-1609.hva.2025.01.022
  CLC：
- Received：06 August 2024，
  
  Revised：16 October 2024，
  
  Published：16 January 2025
- 稿件说明：
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LI Weiguo, ZHANG Changhong, YANG Xu, et al. Surface Charge Accumulation Characteristic on GIL Three-pillar Insulator[J]. High voltage apparatus, 2025, 61(1): 189-196.
DOI：

LI Weiguo, ZHANG Changhong, YANG Xu, et al. Surface Charge Accumulation Characteristic on GIL Three-pillar Insulator[J]. High voltage apparatus, 2025, 61(1): 189-196. DOI： 10.13296/j.1001-1609.hva.2025.01.022.

摘要

表面电荷积聚特性主要集中在平板试样、盆式绝缘子，对GIL设备用三支柱绝缘子表面电荷积聚特性鲜有报道。文中以实际550 kV GIL三支柱绝缘子为试品，建立三支柱绝缘子三维测量试验平台，采用电容探头法，改变电压幅值、加压时间、粗糙度，试验获取三支柱绝缘子表面电荷积聚规律。结果表明：交流电压作用下GIL三支柱绝缘子支柱区域积聚的电荷密度较小，而腹部区域积聚的电荷密度较大；提高试验电压幅值、延长试验电压作用时间、增大支柱绝缘子表面粗糙度，均可增加GIL三支柱绝缘子表面电荷密度；一定条件下，交流电压下随着表面电荷的积聚，500 kV三支柱绝缘子沿面闪络电压减小约9.6%。文中研究可为GIL设备三支柱绝缘子设计优化及设备运维提供一种解决问题的思路。

Abstract

Surface charge accumulation characteristics are mainly concentrated in flat sample and insulating spacer and the report on surface charge accumulation characteristics of the GIL three-pillar insulator is less. In this paper

the actual 550 kV GIL three-pillar insulator is taken as the prototype

a three-dimensional measurement test platform for three-pillar insulator is set up and the surface charge accumulation of the three-pillar insulator is obtained by testing by using the capacitive probe method to change voltage amplitude

voltage application duration and surface roughness. The results show that under the action of AC voltage the accumulated charge density at the GIL three-pillar insulator area is smaller and at the abdomen area is higher. Increase of test voltage amplitude

extension of operation time of test voltage and increase of surface roughness of insulator can increase the surface charge density of GIL. Under certain condition

with the accumulation of surface charge at AC voltage the surface flashover voltage of the 500 kV three-pillar insulator is reduced by about 9.6%. The research in this paper can provide a kind of solution for the design optimization

operation and maintenance of GIL three-pillar insulator.

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