CAJ | 학술논문

高电压等级的气体绝缘金属封闭开关设备(gas insulated metal enclosed switchgear and controlgear,GIS)在发生大电流短路故障时,常常由于短路能量较大,故障设备烧蚀严重而无法确定故障位置和直接原因。针对此,采用扫描电子能谱(energy disperse spectroscopy,EDS)法对发生故障的220 kV某变电站 GIS 设备 SF6气体分解产物及故障区域表面附着物进行分析研究,结合返厂解体,同时考虑断路器设备原件的成分组成,分析了造成事故的原因。同时,在实体220 kV GIS内试验研究了铁质金属颗粒对 GIS绝缘强度的影响和绝缘劣化的危险程度。结果表明：GIS断路器内存在铁质金属异物是造成事故的直接原因,厂内安装控制不严造成的带缺陷出厂为间接原因；在同一电压等级下,金属异物越大对 GIS 的绝缘强度影响越明显,绝缘劣化越突出,GIS 越易发生闪络事故。
고전압등급적기체절연금속봉폐개관설비(gas insulated metal enclosed switchgear and controlgear,GIS)재발생대전류단로고장시,상상유우단로능량교대,고장설비소식엄중이무법학정고장위치화직접원인。침대차,채용소묘전자능보(energy disperse spectroscopy,EDS)법대발생고장적220 kV모변전참 GIS 설비 SF6기체분해산물급고장구역표면부착물진행분석연구,결합반엄해체,동시고필단로기설비원건적성분조성,분석료조성사고적원인。동시,재실체220 kV GIS내시험연구료철질금속과립대 GIS절연강도적영향화절연열화적위험정도。결과표명：GIS단로기내존재철질금속이물시조성사고적직접원인,엄내안장공제불엄조성적대결함출엄위간접원인；재동일전압등급하,금속이물월대대 GIS 적절연강도영향월명현,절연열화월돌출,GIS 월역발생섬락사고。
Due to large short-circuit energy and serious erosion of faulted equipments,it is unable to determine fault position and direct reasons when high voltage gas insulated metal enclosed switchgear and controlgear(GIS)happens large current short-circuit fault. In view of this,this paper analyzes and studies SF6 decomposition product of faulted GIS in some 220 kV substation and attachments on surface of faulted region by using energy disperse spectroscopy method. Combining disassem-bly return to depot and considering composition of breaker device,it analyzes reasons for causing the accident. Meanwhile, it studies impact on dielectric strength of GIS by ferruginous metallic particles and criticality of insulation deterioration in 220 kV GIS. The result indicates that the direct reason for the accident is ferruginous metallic particles in GIS breaker and the indirect reason is relax control on installation which makes GIS with defects. With the same voltage level,impact on die-lectric strength of GIS by metallic particles is more obvious,insulation deterioration is more severe and the GIS is liable to come up flashover.