一起GIS設備漏氣及現(xiàn)場交流耐壓試驗擊穿故障分析
胡全義,秘立鵬,劉天奇,張欣偉
(國網(wǎng)內(nèi)蒙古東部電力有限公司電力科學研究院,內(nèi)蒙古 呼和浩特 010020)
摘 要:針對某220 kV 變電站66 kV 氣體絕緣金屬封閉組合電器(GIS) 因盆式絕緣子出現(xiàn)裂痕發(fā)生漏氣事件,介紹了設備漏氣故障點發(fā)現(xiàn)過程,解體處理后進行主回路絕緣試驗過程中出現(xiàn)擊穿現(xiàn)象,通過閃絡定位儀準確定位到擊穿氣室,再次解體發(fā)現(xiàn)導電座上有明顯的磕碰痕跡,改變了導電座周圍的空間電場分布,導致在耐壓過程中導電座下側(cè)局部電場發(fā)生畸變,耐壓過程中最終在絕緣子表面發(fā)生了沿面閃絡放電。試驗驗證了閃絡定位儀在閃絡故障檢測及故障點定位應用中的準確性和有效性,可在高壓設備交接試驗中推廣。
關(guān)鍵詞:GIS;盆式絕緣子;SF6 氣體泄漏;交流耐壓;定位
中圖分類號:TM595 文獻標識碼:B 文章編號:1007-3175(2017)08-0043-04
A Case of Insulated Swithgear Equipment Air Leakage and Site AC Withstand Voltage Test Breakdown Fault Analysis
HU Quan-yi, MI Li-peng, LIU Tian-qi, ZHANG Xin-wei
(State Grid East Inner Mongolia Electric Power Company Research Institute, Hohhot 010020, China)
Abstract: In allusion to the leakage event of basin-type insulator cracks in the 66 kV gas insulated switchgear (GIS) in the 220 kV substation, introduction was made to the discovery process of equipment air leakage fault points and the punchthrough in the process of major loop insulation test after disintegration disposal. The flashover position indicator was used to carry out accurate positioning to the breakdown air chamber. There were obvious signs of bumps on the conductive seat, which changed the space electric field around the conductive seats and caused electric field distortion in the process of withstand voltage downside the conductive seat. In the process of withstand voltage the flashover discharged along surface of the insulators finally. The test verifies the accuracy and validity of the flashover position indicator applied in the flashover faults testing and positioning.
Key words: gas insulated switchgear; basin-type insulator; SF6 leakage; AC withstand voltage; positioning
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