Fault Analysis of a Support Insulator for 500 kV GIL Tubular Busbar

CHEN Jing; CAO Hong; LI Guogen; WANG Dianlang

doi:10.13296/j.1001-1609.hva.2024.01.022

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Fault Analysis of a Support Insulator for 500 kV GIL Tubular Busbar

Technical Discussion | 更新时间：2025-04-26

- Fault Analysis of a Support Insulator for 500 kV GIL Tubular Busbar
- High Voltage Apparatus Vol. 60, Issue 1, Pages: 190-196(2024)
- 作者机构：
  
  中国南方电网有限责任公司超高压输电公司曲靖局，云南　曲靖　 655000
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2024.01.022
  CLC：
- Received：11 September 2023，
  
  Revised：21 November 2023，
  
  Published：16 January 2024
- 稿件说明：
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CHEN Jing, CAO Hong, LI Guogen, et al. Fault Analysis of a Support Insulator for 500 kV GIL Tubular Busbar[J]. High voltage apparatus, 2024, 60(1): 190-196.
DOI：

CHEN Jing, CAO Hong, LI Guogen, et al. Fault Analysis of a Support Insulator for 500 kV GIL Tubular Busbar[J]. High voltage apparatus, 2024, 60(1): 190-196. DOI： 10.13296/j.1001-1609.hva.2024.01.022.

摘要

为了分析某换流站的一起500 kV GIL管母支柱绝缘子故障，对故障GIL开展解体检查、结构原理分析、重力影响分析、导体膨胀仿真计算、绝缘子浇注工艺分析、绝缘子装配工艺分析等。通过研究分析，确定了GIL故障原因为三支柱绝缘子铝质金属表面与绝缘体之间存在微小间隙缺陷，在生产、运输、安装、运行等过程中小间隙逐渐扩展、劣化，最终导致击穿放电。最后从强化生产工艺控制、提升出厂检测标准、提高运输过程管控要求、加强现场超声波带电局放测试几方面提出改进建议，为后续GIL生产、运输、运维等方面提供借鉴。

Abstract

For analyzing the fault of a 500 kV GIL tubular busbar support insulator at a converter station

the disassembly inspection

structural principle analysis

gravity effect analysis

conductor expansion simulation calculation

casting process analysis of insulator and assembly process analysis of the insulator are developed. Through research and analysis

it is determined that the fault of GIL is caused by tiny gap defect between aluminum metal surface and three support insulator

which gradually expands and degrades in the process of production

transportation

installation and operation

and finally leads to breakdown discharge. Finally

the improvement suggestions are proposed from the aspects of strengthening the production process control

improving the delivery testing standards

improving the management and control requirements of the transportation process

and strengthening the on-site ultrasonic live partial discharge test so as to provide reference for the subsequent production

transportation

operation and maintenance of GIL.

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