多種手段聯合判斷GIS閃絡故障原因及分析
秘立鵬，胡全義，萬潤楠
（國網內蒙古東部電力有限公司電力科學研究院，內蒙古 呼和浩特 010020）
摘 要：針對某變電站500 kV氣體絕緣金屬封閉開關設備（GIS）開展現場交接試驗過程中出現擊穿的問題，通過閃絡定位儀、氣體分析儀及絕緣檢測等多種手段對故障間隔氣室進行定位，查找故障點，判斷故障原因。解體后發現GIS內部導電桿上有明顯的磕碰痕跡，改變了導電桿周圍電場的分布規律，導致耐壓過程中導電桿周圍電場發生畸變，在導電桿上發生沿面放電，出現絕緣擊穿現象。此次故障的發現及分析，為之后的交接試驗及現場安裝提供了經驗。
關鍵詞：氣體絕緣金屬封閉開關設備；交流耐壓；局部放電；導電桿；定位
中圖分類號：TM643 文獻標識碼：B 文章編號：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
參考文獻
[1] 劉君華，徐敏驊，黃成軍，等. 局部放電電磁波在GIS中的衰減特性[J]. 電工技術學報，2010，25(8)：52-58.
[2] 李秀衛，云玉新. 實測信號激勵條件下GIS局部放電的電磁波傳播特性研究[J]. 高壓電器，2011，47(12)：34-38.
[3] 印華，邱毓昌. GIS中局部放電測量用超高頻方法的研究[J]. 高電壓技術，2004，30(10)：19-21.
[4] 王昌長，李福祺，高勝友. 電力設備的在線監測與故障診斷[M]. 北京：清華大學出版社，2006.
[5] DL/T 617—2010 氣體絕緣金屬封閉開關設備技術條件[S].
[6] 李繼勝，趙學風，楊景剛，等.GIS典型缺陷局部放電測量與分析[J]. 高電壓技術，2009，35(10)：2440-2445.
[7] 高凱，倪浩，司文榮. GIS局部放電檢測及其波形特征分析[J]. 華東電力，2010，38(10)：1512-1517.
