Partial Discharge Characteristics at the Interface Gap of Metal Inserts of GIS Support Insulator

YE Sanpai; YAO Yongqi; LI Xing; WANG Jian; SANG Zhiyue; LI Lina; YANG Yi; HAO Jianzhen

doi:10.13296/j.1001-1609.hva.2025.12.017

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Partial Discharge Characteristics at the Interface Gap of Metal Inserts of GIS Support Insulator

Research & Analysis | 更新时间：2025-12-09

- Partial Discharge Characteristics at the Interface Gap of Metal Inserts of GIS Support Insulator
- High Voltage Apparatus Vol. 61, Issue 12, Pages: 126-132(2025)
- 作者机构：
  
  平高集团有限公司，河南平顶山 467001
  清华大学电机工程与应用电子技术系电力系统及发电设备控制和仿真国家重点实验室，北京 100084
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2025.12.017
  CLC：
- Received：05 April 2025，
  
  Revised：2025-07-25，
  
  Published：16 December 2025
- 稿件说明：
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YE Sanpai, YAO Yongqi, LI Xing, et al. Partial Discharge Characteristics at the Interface Gap of Metal Inserts of GIS Support Insulator[J]. High Voltage Apparatus, 2025, 61(12): 126-132.
DOI：

YE Sanpai, YAO Yongqi, LI Xing, et al. Partial Discharge Characteristics at the Interface Gap of Metal Inserts of GIS Support Insulator[J]. High Voltage Apparatus, 2025, 61(12): 126-132. DOI： 10.13296/j.1001-1609.hva.2025.12.017.

摘要

环氧绝缘件是气体绝缘开关设备（gas insulated switchgear，GIS）的重要组成部件之一，其可靠性直接关系着GIS设备的安全稳定运行。环氧绝缘与金属嵌件交界面缝隙是一种常见的GIS固体绝缘内部缺陷，会引起局部放电，加速绝缘老化劣化，并最终导致绝缘击穿。论文搭建了满足工厂生产需要的252 kV GIS支柱绝缘子高灵敏度脉冲电流法局部放电测量系统，研究了支柱绝缘子金属嵌件交界面缝隙的局部放电特性。试验结果表明，标准规定局部放电试验电压下，未能激发缺陷局部放电；更高电压下局部放电表现出微弱和偶发特性，常规方法难以检测。局部放电PRPD图谱存在明显的极性效应，正负工频半周期内局部放电信号不对称；并且可能出现多个放电信号簇，表明嵌件缝隙中可能存在多处位置的局部放电。文中研究结果为进一步认识绝缘子嵌件交界面缝隙的局部放电特征，提升缺陷检测和识别能力提供了重要参考。

Abstract

Epoxy isulation component is one of the essential parts of gas insulated switchgear（GIS）

and its reliability is directly related to the safe and stable operation of GIS equipment. Gap delamination at interface between epoxy insulation and metal inserts is a common internal defect of solid insulation of GIS

which will cause partial discharge（PD）

accelerate insulation aging and deteriorationand eventually lead to insulation breakdown. In this paper a high sensitivity pulse current PD measurement system for 252 kV GIS support insulator meeting factory production requirement is set up

and then the PD characteristics of gap delamination at the epoxy/electrode interface under different test voltages are studied. The test results show that under the PD test voltage specified in the standard

no defect-induced partial discharge is triggered. At a higher voltage

the PD is weak and sporadic

which is difficult to be detected by the conventional PD detection method. The PRDD pattern of PD has obvious polarity effect

and the PD signals in positive and negative half cycles are unsymmetrical and multiple clusters of discharge signals may appear

indicating that there may be discharges at multiple positions in the gap delamination. The research results in this paper can provide an important reference for further understanding the PD characteristics of gap delamination of insulator and improving the effectiveness of PD detection.

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references

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