多种手段联合判断GIS闪络故障原因及分析
秘立鹏，胡全义，万润楠
（国网内蒙古东部电力有限公司电力科学研究院，内蒙古 呼和浩特 010020）
摘 要：针对某变电站500 kV气体绝缘金属封闭开关设备（GIS）开展现场交接试验过程中出现击穿的问题，通过闪络定位仪、气体分析仪及绝缘检测等多种手段对故障间隔气室进行定位，查找故障点，判断故障原因。解体后发现GIS内部导电杆上有明显的磕碰痕迹，改变了导电杆周围电场的分布规律，导致耐压过程中导电杆周围电场发生畸变，在导电杆上发生沿面放电，出现绝缘击穿现象。此次故障的发现及分析，为之后的交接试验及现场安装提供了经验。
关键词：气体绝缘金属封闭开关设备；交流耐压；局部放电；导电杆；定位
中图分类号：TM643 文献标识码：B 文章编号：1007-3175(2018)03-0050-04
Multiple Methods to Judge and Analysze Fault Cause of Gas Insulated Switchgear
MI Li-peng, HU Quan-yi, WAN Run-nan
（State Grid East Inner Mongolia Electric Power Research Institute, Hohhot 010020, China）
Abstract: In allusion to the breakdown problem existing in a substation’s 500 kV gas insulated switchgear (GIS) during the onsite handover test, the fault gas compartment was located by means of flashover locator, gas analyzer and insulation detector etc, the fault point was searched and the cause of the fault was judged. After disintegration, it was found that there were obvious bump marks on the conductive rods inside the GIS and the distribution of the electric field around the conductive rods was changed. As a result, the electric field around the conductive rods was distorted during discharge and creeping discharge occurred on the conductive rods, resulting in dielectric breakdown. The discovery and analysis of this fault provided precious practical experience for the handover test and onsite installation later.
Key words: gas insulated switchgear; alternating current withstand voltage; partial discharge; conducting rod; positioning
参考文献
[1] 刘君华，徐敏骅，黄成军，等. 局部放电电磁波在GIS中的衰减特性[J]. 电工技术学报，2010，25(8)：52-58.
[2] 李秀卫，云玉新. 实测信号激励条件下GIS局部放电的电磁波传播特性研究[J]. 高压电器，2011，47(12)：34-38.
[3] 印华，邱毓昌. GIS中局部放电测量用超高频方法的研究[J]. 高电压技术，2004，30(10)：19-21.
[4] 王昌长，李福祺，高胜友. 电力设备的在线监测与故障诊断[M]. 北京：清华大学出版社，2006.
[5] DL/T 617—2010 气体绝缘金属封闭开关设备技术条件[S].
[6] 李继胜，赵学风，杨景刚，等.GIS典型缺陷局部放电测量与分析[J]. 高电压技术，2009，35(10)：2440-2445.
[7] 高凯，倪浩，司文荣. GIS局部放电检测及其波形特征分析[J]. 华东电力，2010，38(10)：1512-1517.
