1问题的提出DF4D型机车与DF10D型机车相比,电气故障率明显下降,牵引性能却大大提高。然而,随着机车运行速度的不断提高,机车振动加剧,对预防、根治机车电气线路接地的故障也提出了新的要求。虽然一点接地不会造成机车的重大破损,但机车主电路、励磁电路、控制电路或照明电路中? 1 PROBLEM PROBLEMS Compared with the DF10D locomotive, the DF4D locomotive has significantly reduced the electrical failure rate and greatly improved the traction performance. However, as locomotive running speed continues to increase, locomotive vibration increased, to prevent, cure locomotive electrical circuit grounding fault also put forward new requirements. Although a little grounding will not cause major damage to the locomotive, but locomotive main circuit, excitation circuit, control circuit or lighting circuit?