This paper discusses the mechanism of DC metro train failure, holds that some improvement measures, such as interference prevention, the change of the designed protection value, an increase in the number of inverter and DC/ DC booster, shall be taken.

• 对该故障,可通过防止干扰引起的误触发、变保护动作设定值、设逆变器起动专用dc/C升压变换器等措施予以解决。