主断路器是电力机车的总开关、总保护,其关键部位是主阀。主阀质量的好坏(即灵活性、封闭性、可靠性)直接影响主断路器的开、关时间和整体质量。重庆西机务段共配届SS1型电力机车38台,自1985年投入运用到现在,相继发生17台次主阀卡位故障(据不完全统计),特别是1986、1987年春运期间,卡位故障较为频繁,多次造成临修,直接影响运输安全。就 The main circuit breaker is the main switch of the electric locomotive, the total protection, the key part is the main valve. The quality of the main valve (ie, flexibility, closure, reliability) directly affect the main circuit breaker on and off time and the overall quality. Chongqing West Railway Station with a total of SS1 electric locomotive 38, since 1985 put into use now, have occurred in 17 times the main valve card bit failure (according to incomplete statistics), especially in 1986, 1987 during the Spring Festival, card bit Failure is more frequent, resulting in temporary repair, a direct impact on transport safety. on