Influence of Surface Charge on Flashover Voltage of Gas Insulated Substation Basin Insulator Under AC and DC Voltage

QI Bo; GAO Chunjia; ZHAO Linjie; LI Chengrong; TU Youping

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Influence of Surface Charge on Flashover Voltage of Gas Insulated Substation Basin Insulator Under AC and DC Voltage

更新时间：2025-12-08

- Influence of Surface Charge on Flashover Voltage of Gas Insulated Substation Basin Insulator Under AC and DC Voltage
- Vol. 43, Issue 3, Pages: 915-922(2017)
- 作者机构：
  
  1. 华北电力大学新能源电力系统国家重点实验室
  2. 华北电力大学高电压与电磁兼容北京市重点实验室
  3. 南方电网科学技术研究院
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published Online：10 March 2017，
  
  Published：2017
- 稿件说明：
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QI Bo, GAO Chunjia, ZHAO Linjie, et al. Influence of Surface Charge on Flashover Voltage of Gas Insulated Substation Basin Insulator Under AC and DC Voltage[J]. 2017, 43(3): 915-922.
DOI：

QI Bo, GAO Chunjia, ZHAO Linjie, et al. Influence of Surface Charge on Flashover Voltage of Gas Insulated Substation Basin Insulator Under AC and DC Voltage[J]. 2017, 43(3): 915-922. DOI：

摘要

在气体绝缘变电站（GIS）中

盆式绝缘子表面电荷的存在会使局部电场发生畸变

严重时还会降低沿面闪络电压。为此

研制了一种用于实际252 k V GIS盆式绝缘子表面电荷的3维测量装置

可以对盆式绝缘子表面电荷进行全径向、全角度测量。参考实际盆式绝缘子的绝缘设计裕度及其沿面闪络特性

设计了闪络试验模型

分别针对直流、交流电压作用下绝缘子表面电荷对沿面闪络电压的影响开展了研究。结果表明:在交流电压和直流电压作用下

随着表面电荷积累量的增加

绝缘子沿面闪络电压有所减小;相比于交流电压50 k V作用1 h工况下

在53 k V交流电压作用3 h工况下

盆式绝缘子的沿面闪络电压降低了10.2%

而直流电压下

绝缘子的沿面闪络电压最大可降低23.0%

这说明了绝缘子表面电荷的存在对其沿面闪络电压具有明显的影响

在绝缘设计时需予以重视。研究结果可为GIS及气体绝缘输电线路（GIL）绝缘子的绝缘设计提供参考。

Abstract

The accumulated surface charge of the insulators in gas insulated substation（GIS） can not only distort the electric field but also decrease the surface flashover voltage.We established a set of high-precision surface charge measurement system utilizing the static capacitive probe method and a matched three-dimensional manipulation devices based on actual 252 k V GIS basin insulator.Referring to the insulating design and flashover properties of GIS basin insulator

an effective surface flashover experimental model was set up.The experimental results indicate that no matter under AC or DC voltage

the more the accumulated surface charge is

and the more the decrease of surface flashover voltage will be.Compared to the surface flashover voltage of insulator under 50 k V AC voltage for 1 hour

the voltage under the condition of 53 k V AC voltage for 3 hours can decrease by 10.2%

while it reaches 23.0% under DC voltage

which indicates the accumulated surface charge has a significant influence on the flashover and must be considered seriously for the insulation design.The research achievement in this paper can provide meaningful reference to the insulating design of insulators in GIS and gas insulated line（GIL）.

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