Research on the Characteristics and Mechanism of Partial Discharge of Internal Crevice in GIS Insulator

XU Yang; LIU Weidong; GAO Wensheng

doi:10.13296/j.1001-1609.hva.2020.07.017

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Research on the Characteristics and Mechanism of Partial Discharge of Internal Crevice in GIS Insulator

更新时间：2025-04-26

- Research on the Characteristics and Mechanism of Partial Discharge of Internal Crevice in GIS Insulator
- High VoltageApparatus Vol. 56, Issue 7, Pages: 116-122(2020)
- 作者机构：
  
  1. 国网苏州供电公司
  2. 清华大学电机系电力系统及发电设备控制与仿真国家重点实验室
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2020.07.017
  CLC： TM216
- Published：2020
- 稿件说明：
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[1]徐洋,刘卫东,高文胜.GIS绝缘子内部缝隙的局部放电特性和机理研究[J].高压电器,2020,56(07):116-122.

XU Yang, LIU Weidong, GAO Wensheng. Research on the Characteristics and Mechanism of Partial Discharge of Internal Crevice in GIS Insulator[J]. High voltageapparatus, 2020, 56(7): 116-122.
[1]徐洋,刘卫东,高文胜.GIS绝缘子内部缝隙的局部放电特性和机理研究[J].高压电器,2020,56(07):116-122. DOI： 10.13296/j.1001-1609.hva.2020.07.017.

XU Yang, LIU Weidong, GAO Wensheng. Research on the Characteristics and Mechanism of Partial Discharge of Internal Crevice in GIS Insulator[J]. High voltageapparatus, 2020, 56(7): 116-122. DOI： 10.13296/j.1001-1609.hva.2020.07.017.

摘要

GIS绝缘子内部缝隙是一种较为常见的绝缘缺陷。但对其产生局部放电的特性和机理的研究大多基于实验室模拟缺陷

较少有以实际绝缘子上的缝隙为对象展开的研究

因而得到的结果也不可避免地与现场的实际情况存在一定的偏差。文中以一个包含内部缝隙的GIS支柱绝缘子为对象

研究了其在短时间和长时间高压作用下的局部放电特性

并使用介质阻挡放电模型解释了其产生局部放电的机理和过程。将理论分析推理得到的放电特性与实测放电特性进行了比较

证明了理论分析过程的正确性;并合理地解释了该放电不易被特高频方法所检测的原因。文中的研究内容对于绝缘子制造工艺的改进

以及绝缘子内部缝隙的出厂试验和现场检测方法的选择具有重要的参考意义。

Abstract

The crack inside the GIS insulator is a common insulation defect. However

most of the researches on the characteristics and mechanism of the partial discharge（PD）of it are based on the artificial defect made in the laboratory

rather than the cracks found on practical insulators

and thus

the results of those investigations are inevitably inaccurate compared with the practical situation in substations. In this paper

a GIS post insulator with crack inside is introduced to study its PD characteristics under short term and long term high voltage

and the mechanism and process of the discharge is explained using the dielectric barrier discharge（DBD）model. The characteristics derived from the theoretical analysis are compared with those obtained in the PD experiment to demonstrate the validity of the analysis

and the reason why the discharge is unable to be detected by the ultra-high frequency（UHF）method is explained. The research contents in this paper will make significant sense on the improvement of the manufacturingtechnique and the selection of the detecting method in delivery test and on-site measurement.

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