为满足使用要求，分析了影响气体绝缘开关（GIS）设备密封圈耐寒性能的关键因素，选择出了适合在高寒环境下使用的GIS设备密封圈材料；并对GIS设备密封圈在高寒环境下的喷霜和漏气原因进行了分析。结果表明：在高寒环境下，GIS设备密封圈材料可选用改性后的三元乙丙橡胶。密封圈中的活性剂、填充剂在橡胶中的溶解度随着温度的下降而减小，在低于临界值后，橡胶表面出现喷霜现象。密封圈装配时，密封圈拉伸导致线径减小，且低温下密封圈压缩率降低，导致GIS设备出现漏气问题，可通过改变密封结构设计来解决密封圈漏气的问题。

In order to meet the application requirements, the key factors affecting the cold resistance of gas insulated switch (GIS) equipment sealing ring were analyzed, and the sealing ring material suitable for use in alpine environment was selected. The causes of blooming and blowing of GIS equipment sealing ring in alpine environment were analyzed. The results show that the modified ethylene-propylene terpolymer could be used as sealing ring material of GIS equipment in alpine environment. The solubility of active agent and filler in the sealing ring decreases with the decrease of temperature. When it was lower than the critical value, blooming appeared on the rubber surface. When the sealing ring was assembled, the wire diameter decreased due to the stretching of the sealing ring, and the compression ratio of the sealing ring decreased at low temperature, which led to the GIS equipment blowing. The blowing problem could be solved by changing the sealing structure design.