城市轨道交通小电阻接地供电系统零序保护问题探讨

介绍了城市轨道交通领域小电阻接地供电系统及相关保护配置,重点针对零序保护存在的问题进行了分析,论述单相短路时电容电流的变化及对零序保护整定及保护灵敏度的影响,并对该类故障预防措施提出相关建议。

this article introduces the small resistance grounding power supply system and related protection configuration in the field of urban rail transit,mainly analyzes the problems existing in zero-sequence protection,discusses the change of capacitance current when single-phase short circuit and its influence on the setting and protection sensitivity of zero-sequence protection,and puts forward some Suggestions on the prevention measures of this kind of fault.