Simulation Analysis on Interference to Low Voltage Power System Caused by Lightning Wave
Wang Yao-yu · Insulators and Surge Arresters · 2008
The computer protection system constitutes a major component of power system,but the invasion of lightning surge may lead to its failure due to its low voltage withstand level which may af-fect the normal service of power system.Model was established according to the path of lightning inva-sion to power supply of microcomputer at substation.Simulation analysis was done on impulse voltage caused by lightning invasion into low-voltage power supply system.Influence on impulse voltage was discussed under conditions whether there is varistor on low-voltage side of transformer,location from lightning invasion,and disposition of varistor.Simulation results demonstrate that,installation of varistor on low-voltage side of transformer can effectively inhibit invasion lightning;the smaller the distance of varistor to low-voltage side of transformer,the better it turns out;impulse voltage is droped when line is on load;install protector with different level to combined with according to need,can effectively re-duce interference of lightning invasion to low-voltage power supply.