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宝成电气化铁路自1975年全线开通以来,由于工业污染日益加重,接触网绝缘子绝缘强度明显下降,以至经常发生污闪事故。尤其在蒸汽、电力混合牵引的车站和靠近工业污源(化工厂、冶炼厂、水泥厂)的线路上,当气候条件不利时(小雨、雾等),污闪事故更为频繁,使运输生产受到严重损失。据宝风段1960—1977年接触网事故跳闸统计;18年总跳闸次数为2,453次,平均每年跳闸136.3次,其中接触网绝缘不良的事故占15％。成都局广成段近几年统计,接触网跳闸事故约占牵引供电系统总事故的20％。接触网绝缘不良的跳闸事故,最高占接触网总跳闸的80％。多数绝缘不良的跳闸事故是由1302绝缘子引起的。
Baocheng electrified railway since its opening in 1975 across the board, due to increasing industrial pollution, catenary insulator dielectric strength decreased significantly, as often flashover pollution accident. Especially in the steam-electric hybrid towing stations and lines near industrial sources (chemical plants, smelters, cement plants), pollution flashovers are more frequent when weather conditions are unfavorable (light rain, fog, etc.) Seriously damaged. According to the statistics of the accidental crashes of the catenary network from 1960 to 1977 in Baoan section, the total number of trips in 18 years was 2,453 times, with an average of 136.3 trips per year. Among them, 15% were crashed in the catenary network. Chengdu Bureau Guangcheng segment statistics in recent years, catenary trip accidents accounted for about 20% of the traction power supply system. Catenary tripping failure, up to 80% of the total trip catenary. The majority of poorly insulated trip accidents are caused by 1302 insulators.