弱电系统雷电过电压波过程

Wave process of thunderbolt overvoltage in light current system

针对雷电过电压通过电源线路入侵弱电系统,建立三级防雷保护模型,给出各级保护元件的等效电路分析和数学模型,应用均匀传输线理论进行波过程分析;根据各节点处波的反射与折射,推导出流过各级保护器的电流表达式.Matlab仿真分析结果表明:到达弱电系统时雷电过电压已被箝制在安全水平.

Aiming at the thunderbolt overvoltage invasion to light current system through power supply line, a three - level lightning protection model is built in this paper. The equivalent circuit of each protector and its mathematical modeling is presented. The wave process of thunderbolt overvoltage is analyzed using uniform transmission line theory. According to the wave＇s reflection and refraction in every node, the current expression through each protector is deducted. Simulation results with Matlab software show that the thunderbolt overvoltage arriving at the light current system is limited to safe level.