一级、二级检修是在运行整备状态下,完成消耗部件的更换、调整和补充等,同时对各部分的状态和性能进行检查,发现偶然发生的故障,在车辆使用的间隙进行维修作业。根据动车组一级检修作业,结合我校的实际情况,选择了两个检修作业项目:作业准备、断电前作业。 The first and second level maintenance is to complete the replacement, adjustment and replenishment of the consumable parts in the running state. At the same time, the status and performance of each part are inspected, accidental failures are found, and maintenance work is carried out in the gap of the vehicles. According to the EMU level maintenance work, combined with the actual situation in our school, chose two maintenance operations: work preparation, power before the operation.