By introducing one point earthing leading to breaker tripping in DC system, this paper analyses the reasons that breaker may trip when one point earthed in DC system.

• 通过对直流系统负极一点接地引起开关跳闸的情况介绍,分析了直流系统在一点接地时可能出现的开关跳闸原因,并提出了相应的防范措施和对策。