220 kV变电站GIS隔离开关气室放电故障分析

Analysis of Discharge Fault in the GIS Isolating Switch Air Chamber in a 220 kV Substation

针对一起220 kV变电站GIS隔离开关气室放电故障,通过检查现场一次设备、查阅保护录波图、解体GIS隔离开关气室,得出隔离开关C相气室地刀动触头屏蔽罩对筒壁放电应为异物引发所致,而主刀静触头屏蔽罩对筒体放电是本起故障的重要原因。

In view of a discharge fault in the GIS isolating switch air chamber of a in a 220 kV substation,by checking the on-site primary equipment,reviewing the protection recording diagram,and dismantling the GIS isolation gas chamber,it is concluded that the discharge of the knife moving contact shielding cover of the disconnector C phase gas chamber to the cylinder wall should be caused by foreign matter,and the discharge of the cylinder by the main knife static contact shielding cover is an important cause of this failure.