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由于大气环境的影响,变电站绝缘瓷瓶的电气绝缘能力会降低,严重时会使高压电对地闪络放电,造成设备损坏和停电事故。为此,要对绝缘瓷瓶定期进行清扫。清扫的方式有停电清扫和带电清扫两种。在清扫瓷瓶的过程中,由于安全措施不当,有时会发生人身伤亡事故。据西北五省(区)电力部门所属的35kV 以上的变电站统计,1980～1986年共发生伤亡事故8起,死亡4人,重伤4人。造成这些事故的原因主要有:
Due to the impact of the atmospheric environment, the insulation capacity of substation insulating porcelain vats will be reduced. In severe cases, the flashover discharge will occur on the high-voltage power lines, resulting in equipment damage and power outage. To this end, to regularly clean the insulating porcelain. There are two ways of cleaning: power outage cleaning and live cleaning. In the process of cleaning porcelain, due to improper safety measures, sometimes personal injury and death accidents occur. According to the statistics of the substations above 35kV belonging to the power sector of the five provinces (autonomous regions) in the northwest China, there were 8 casualties in 1980-1986 with 4 deaths and 4 seriously injured. The main causes of these accidents are: