雷电波侵入低压电源线引起冲击电压的仿真研究

针对雷电波侵入电力调度通信大楼电源线引起的冲击电压进行仿真研究，分别考虑不同的电缆接线方式、是否接压敏电阻以及压敏电阻的组数对冲击电压的影响。计算结果表明：未加装压敏电阻时，各结点电压随电缆长度的增加而升高；加装压敏电阻后，电缆沿线各结点冲击电压得到有效抑制；线路带负载后冲击电压进一步降低。在总配电柜及微电子设备的供电处各安装一组过电压保护器，可以有效降低冲击电压对大楼内微电子设备造成的危害。

Simulation Study on Impulse Voltage Caused by Intrusion of Lightning Wave into Low Voltage Power Cable

The impulse voltage caused by intrusion oflightning wave into low voltage power cable laying down inpower dispatching center building is researched when thefactors, such as different cable wiring schemes, whether thepiezoresistors are installed and the number of piezoresistorgroups, are respectively considered. Simulation results showthat the nodal voltage amplitude increases with the length ofcable while the piezoresistor is not adopted; the nodal impulsevoltages along the cable can be effectively suppressed whilethe piezoresistors are adopted; and the impulse voltage can befurther decreased when the cables are loaded. Whenpiezoresistor groups are installed in both master distributingcabinet and power supplies for micro-electronic devices, theimpulse voltage caused damage to micro-electronic devices inthe building can be effectively relieved.