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雷击造成的高速列车车体过电压会使高速列车上的通信、监测、控制等弱电设备受到较大的电磁干扰,容易造成设备的逻辑混乱或者误动作。为研究高速列车雷击短路车体过电压,根据实际情况建立了雷电流流过动车组的等效电路模型,分析了改变车体接地电阻和接地电阻器并联电容时,雷击车体过电压波形和幅值的变化情况。研究结果表明:列车接地系统的接地电阻值较大是产生车体过电压的根本原因,通过减小接地系统阻抗或在接地电阻器并联电容,可有效减小车体过电压的幅值,在接地电阻器上并联电容后,车体过电压波形的波头时间增大,波形上升速率变缓,可以有效抑制过电压对动车组的冲击。
Lightning caused by high-speed train body overvoltage will make high-speed train communication, monitoring, control and other weak electrical equipment by a greater electromagnetic interference, likely to cause the device logic confusion or malfunction. In order to research the overvoltage of lightning stroke short circuit body of high speed train, an equivalent circuit model of lightning current flowing through EMU is established according to the actual situation. When the vehicle body grounding resistance and the shunt resistor of grounding resistor are changed, Amplitude changes. The results show that the grounding resistance of train grounding system is the root cause of vehicle overvoltage. By reducing the grounding system impedance or the shunt resistor of grounding resistor, the amplitude of vehicle overvoltage can be effectively reduced. Grounding resistor shunt capacitance, the body over-voltage waveform wave head time increases, the waveform rise slowed down, you can effectively suppress the over-voltage on the EMU impact.