济南机务段拥有近10台DF4D型准高速内燃机车。近几年来,DF4D型准高速机车主整流柜烧损或接地故障时有发生,特别是夏季雨水较多时,故障率明显增加,严重影响机车供应及安全运输生产,增加了成本支出和检修工作量,给我段造成较大损失。因此,必须及时地研究出解决的方法。1 DF4D型准 Jinan locomotive depot has nearly 10 sets of DF4D-type quasi-high-speed diesel locomotives. In recent years, DF4D-type quasi-high-speed locomotive rectifier cabinet burning or grounding failure occurred from time to time, especially in the summer when the rain is more, the failure rate increased significantly, seriously affecting the supply of motorcycles and the safe transport of production, an increase of costs and maintenance workload , To give me a greater loss segment. Therefore, we must promptly study the solution. 1 DF4D standard