新型动集动车组DC600V系统漏电误报警的分析研究

Analysis and research on leakage false-alarm in DC600V system of a newtype of EMU

新型动集动车组列车级DC600V供配电系统中,列供采用四象限高频整流技术,拖车采用高频整流的充电器和逆变电源。在绝缘检测电路中以磁调制式电流传感器技术为基础的漏电流检测系统,因供配电线路中存在的LC滤波器、分布电容产生了共模干扰,影响了系统的匹配性,出现了误报漏电故障的问题。从抑制共模干扰的角度出发,找出解决改进此问题的方法。

In the train level DC600 V power supply and distribution system of a new type of power-centralized EMU,the head-end power adopts four quadrant high-frequency rectification technology,and the trailer adopts high-frequency rectification charger and inverter power supply.In insulation detection circuits,the leakage current detection system based on magnetic modulation current sensor technology has the problem of misreporting leakage faults due to common mode interference caused by LC filters and distributed capacitors in power supply and distribution lines which affects the matching of the system.From the perspective of suppressing common mode interference,we found a solution to this problem.