Evolution Process and Severity Assessment of the Partial Discharge Caused by Immobilized Metal Particles on DC GIL Insulator Surface

LI Jianbo; GAO Wensheng; LIU Weidong

doi:10.13296/j.1001-1609.hva.2018.05.002

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Evolution Process and Severity Assessment of the Partial Discharge Caused by Immobilized Metal Particles on DC GIL Insulator Surface

更新时间：2025-04-26

- Evolution Process and Severity Assessment of the Partial Discharge Caused by Immobilized Metal Particles on DC GIL Insulator Surface
- High VoltageApparatus Vol. 54, Issue 5, Pages: 9-16(2018)
- 作者机构：
  
  清华大学电机系电力系统及发电设备控制和仿真国家重点实验室
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2018.05.002
  CLC： TM216
- Published：2018
- 稿件说明：
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[1]李建波,高文胜,刘卫东.直流GIL绝缘子表面附着金属颗粒局部放电发展过程及严重程度评估[J].高压电器,2018,54(05):9-16.

LI Jianbo, GAO Wensheng, LIU Weidong. Evolution Process and Severity Assessment of the Partial Discharge Caused by Immobilized Metal Particles on DC GIL Insulator Surface[J]. High voltageapparatus, 2018, 54(5): 9-16.
[1]李建波,高文胜,刘卫东.直流GIL绝缘子表面附着金属颗粒局部放电发展过程及严重程度评估[J].高压电器,2018,54(05):9-16. DOI： 10.13296/j.1001-1609.hva.2018.05.002.

LI Jianbo, GAO Wensheng, LIU Weidong. Evolution Process and Severity Assessment of the Partial Discharge Caused by Immobilized Metal Particles on DC GIL Insulator Surface[J]. High voltageapparatus, 2018, 54(5): 9-16. DOI： 10.13296/j.1001-1609.hva.2018.05.002.

摘要

直流气体绝缘线路（gas insulated line

GIL）绝缘子表面附着金属颗粒会显著降低绝缘子表面的闪络电压

是GIL设备内一种常见的故障。为研究直流GIL绝缘子表面附着金属颗粒所引发局部放电的发展过程并进行严重程度判断

建立了一套220 kV GIL设备局部放电测试平台

在逐步升压时利用紫外观测仪观察了绝缘子表面局部放电的整个发展过程

对不同发展阶段局部放电脉冲电流信号的局部放电量、局部放电间隔时间图谱进行了分析。结果表明:GIL绝缘子表面附着金属颗粒导致的局部放电严重程度可以划分为3个阶段:轻微放电、中度放电和严重放电;随着放电过程的加剧

局部放电信号的局部放电量、局部放电间隔时间图谱跟随出现变化。利用局部放电信号的局部放电量、局部放电间隔时间图谱统计参数Sk、Ku值可以对GIL绝缘子表面附着金属颗粒缺陷引发局部放电的严重程度进行评估。

Abstract

Immobilized metal particles on DC GIL insulator surface significantly reduce the flashover voltage on theinsulator surface

which is a common defect in DC GIL. To study the evolution process and severity assessment ofpartial discharge caused by immobilized metal particles on DC GIL insulator surface

we established a 220 kV GIL equipment platform. By gradually increasing voltage and then using the ultraviolet viewer observed the entire partialdischarge evolution process on insulator surface. Meanwhile

analyzed the average amplitude and time interval ofpartial discharge. The results show that:the severity of partial discharge caused by the immobilized metal particles inthe insulator surface of the GIL can be classed into three levels: mild discharge

moderate discharge and severedischarge;as the discharge process intensified

the average amplitude and time interval of partial discharge followedthe change. The statistical parameter Sk/Kuof average amplitude and time interval of partial discharge can be used toevaluate the severity of the defect caused by immobilized metal particles on DC GIL insulator surface.

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