东风_4型内燃机车,电气线路接地是运用机车普遍存在的惯性故障之一,根据多年来的不完全统计,几乎每年都有100多件接地故障发生,并多次造成机破、临修。东风_4机车段修规程规定,机车架、定修时,均须进行电气线路绝缘状态的检查,以防电气系统出现重大故障而影响机车的正常运用。为了杜绝电气线路绝缘检查时的“死区”出现,1982年我段统一规定了《东风_4型内燃机车 Dongfeng _4 type diesel locomotive, electric circuit grounding is the use of locomotive one of the common inertia failures, according to incomplete statistics over the years, almost every year more than 100 ground fault occurred, and many times to cause the machine broken, temporary repair. Dongfeng _4 locomotive repair regulations, locomotive frame, scheduled repair, must be inspected the insulation status of the electrical lines to prevent major electrical system failure and affect the normal operation of the locomotive. In order to put an end to the “dead zone” of the insulation inspection of the electrical lines, a unified provision was made in 1982 for "Dongfeng-4 diesel locomotive