多種手段聯(lián)合判斷GIS閃絡(luò)故障原因及分析
秘立鵬，胡全義，萬潤楠
（國網(wǎng)內(nèi)蒙古東部電力有限公司電力科學(xué)研究院，內(nèi)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(guān)設(shè)備（GIS）開展現(xiàn)場交接試驗(yàn)過程中出現(xiàn)擊穿的問題，通過閃絡(luò)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(jìn)行定位，查找故障點(diǎn)，判斷故障原因。解體后發(fā)現(xiàn)GIS內(nèi)部導(dǎo)電桿上有明顯的磕碰痕跡，改變了導(dǎo)電桿周圍電場的分布規(guī)律，導(dǎo)致耐壓過程中導(dǎo)電桿周圍電場發(fā)生畸變，在導(dǎo)電桿上發(fā)生沿面放電，出現(xiàn)絕緣擊穿現(xiàn)象。此次故障的發(fā)現(xiàn)及分析，為之后的交接試驗(yàn)及現(xiàn)場安裝提供了經(jīng)驗(yàn)。
關(guān)鍵詞：氣體絕緣金屬封閉開關(guān)設(shè)備；交流耐壓；局部放電；導(dǎo)電桿；定位
中圖分類號：TM643 文獻(xiàn)標(biāo)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
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