南方电网技术2017，Vol.11Issue(1)：1-7,7.DOI:10.13648/j.cnki.issn1674-0629.2017.01.001
±800 kV直流分压器典型绝缘故障的仿真分析与应对措施
Simulation Analysis and Countermeasures of Typical Insulation Faults for ±800 kV DC Voltage Divider
程建伟 1杨家辉 1张曦 1李锐海 1王颂 2赵林杰1
作者信息
- 1. 南方电网科学研究院,广州510663
- 2. 直流输电技术国家重点实验室,广州510663
- 折叠
摘要
Abstract
DC voltage divider is an important measurement equipment in converter station, the insulation failure of DC voltage divider will directly affect the operation of HVDC system.Two typical insulation faults of ±800 kV DC voltage divider are described, the disassembly status and insulation structure are discussed, and the potential and electric field distribution under different operating conditions of the voltage divider are calculated and analyzed, then the cause of faults is proposed as follows: under wicked external insulation operating environment, the insulation resistance of polymeric housed epoxy cylinder of the voltage divider nonlinearly declined, which makes the axial resistance of epoxy cylinder and resistance capacity units unsuitable, and further results in axial potential difference and causes partial discharge, creeping discharge of the epoxy cylinder, and radiate partial discharge and SF6 gas-gap breakdown of the voltage divider.Based on the above analysis, the countermeasures are proposed such as improving the external insulation potential distribution, enhancing the threshold of partial discharge and breakdown, and carrying out the specific operation and maintenance.The research achievements will be of great significance to the selection and operation maintenance of DC voltage divider, and the improvement of operation reliability of ±800 kV DC voltage divider.关键词
±800kV/直流分压器/绝缘结构/运行工况/仿真分析/电位分布Key words
±800 kV/DC voltage divider/insulation structure/operating conditions/simulation analysis/potential distribution分类
信息技术与安全科学引用本文复制引用
程建伟,杨家辉,张曦,李锐海,王颂,赵林杰..±800 kV直流分压器典型绝缘故障的仿真分析与应对措施[J].南方电网技术,2017,11(1):1-7,7.
