Partial Discharge Development and Flashover Characteristics of Metal Particle on 550 kV Triple Post GIL Insulator Surface

LI Xing; DING Dengwei; WU Chuanqi; XU Yuan; TANG Gang

doi:10.13334/j.0258-8013.pcsee.242397

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Partial Discharge Development and Flashover Characteristics of Metal Particle on 550 kV Triple Post GIL Insulator Surface

更新时间：2026-10-12

- Partial Discharge Development and Flashover Characteristics of Metal Particle on 550 kV Triple Post GIL Insulator Surface
- Vol. 46, Issue 4, Pages: 1662-1671(2026)
- 作者机构：
  
  1. 清华四川能源互联网研究院,四川省,成都市,610213
  2. 国网湖北省电力有限公司电力科学研究院,湖北省,武汉市,430077
  3. 中国电力科学研究院有限公司，北京市海淀区,100192
- 作者简介：
- 基金信息：
- DOI：10.13334/j.0258-8013.pcsee.242397
  CLC：
- Published：2026
- 稿件说明：
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LI Xing, DING Dengwei, WU Chuanqi, et al. Partial Discharge Development and Flashover Characteristics of Metal Particle on 550 kV Triple Post GIL Insulator Surface[J]. 2026, 46(4): 1662-1671.
DOI：

LI Xing, DING Dengwei, WU Chuanqi, et al. Partial Discharge Development and Flashover Characteristics of Metal Particle on 550 kV Triple Post GIL Insulator Surface[J]. 2026, 46(4): 1662-1671. DOI： 10.13334/j.0258-8013.pcsee.242397.

摘要

运行过程中，气体绝缘输电线路(gas insulated transmission line，GIL)和气体绝缘开关设备(gas insulated switchgear，GIS)绝缘件无预警闪络事故时有发生。金属异物被认为是诱发闪络的重要原因，但超/特高压GIL/GIS绝缘件表面金属异物局部放电和闪络特性尚未被完全掌握，导致状态诊断和故障预警困难。该文搭建了550 kV GIL三支柱绝缘子真型试验平台，模拟不同位置和长度金属异物缺陷，采用特高频法、脉冲电流法和超声波法同步进行局部放电测量。研究了不同缺陷闪络特征，分析了缺陷闪络前局部放电发展变化规律。结果表明，金属异物距离微粒捕捉器越近，闪络电压越低，且闪络电压与局部放电起始电压比值越小。从局部放电起始到闪络过程中，脉冲电流信号表现为微弱、偶发特征，放电量1~10 pC，放电重复率可低至几次/s。闪络前，局部放电量、特高频信号幅值和放电重复率波动明显，但均无显著增长趋势；整个试验中始终无明显超声信号。缺陷发展过程中，工频正负半周期内放电次数占比变化明显，PRPD和φ-N图谱形态正负半周期对称性改变。

Abstract

During operation

unpredictable insulator flashovers occur frequently in the gas insulated transmission line (GIL) and gas insulated switchgear (GIS). Metal particles are considered an important cause of flashover. However

the partial discharge (PD) and flashover characteristics of metal particles on the ultra/extra-high voltage GIL/GIS insulator surface have not been fully understood

thereby hindering condition diagnosis and fault warning. In this paper

a test platform for an actual 550 kV GIL triple insulator and metal particles with different lengths at different positions are set. The ultra-high frequency (UHF) method

pulse current method

and ultrasonic method are used for PD detection. The flashover characteristics of different defects are studied

and the PD development before flashover is investigated. The results indicate that the closer the defect to the particle trap

the lower the flashover voltage

and the smaller the ratio of flashover voltage to PD inception voltage. Before flashover

the PRPD and φ-N patterns also change significantly. There is a significant change in the proportion of discharge during the positive and negative half cycles. The apparent charge

UHF signal amplitude

and discharge repetition rate fluctuate significantly without exhibiting any significant upward trend.

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