高空核爆电磁脉冲激励下架空导线感应电压的电路求解方法及影响因素分析

Circuit Solution Method and Influencing Factors Analysis of Overhead Conductor Induced Voltage under High-Altitude Nuclear Electromagnetic Pulse Excitation

高空核爆电磁脉冲(HEMP)是核爆炸的第四种效应,HEMP会在架空导线上耦合产生过电压造成设备损坏。为分析任意边界条件下HEMP在架空导线上的感应电压,采用电路方法求解以降低计算的复杂度。通过求解传输线的端口特性参数,推导了传输线的PI型等效电路模型及其参数。结合节点电压法,计算了任意边界条件下传输线首末端点的感应电压时域解,并通过与文献NULINE程序的计算结果对比,验证了方法的正确性。基于该方法,分别研究了土壤电导率、导线高度、入射角对架空导线上感应电压的影响规律。

High-altitude electromagnetic pulse(HEMP)is the fourth effect of nuclear explosion.HEMP can induce large overvoltage on overhead conductors and cause damage to equipment.To analyze the induced voltage on overhead conductors with any boundary conditions,in this paper,the circuit method is adopted to reduce the calculation complexity.By solving the port characteristic parameters of the transmission line,the PI-type equivalent circuit model of the transmission line and its parameters are deduced.Combined with the nodal voltage method,the time-domain solution of the induced voltage at the head and end points of the transmission line under arbitrary boundary conditions is calculated,and the correctness of the method is verified by comparing the calculation results with the literature NULINE program.Based on this method,the effects of soil conductivity,wire height,and incident angle on the induced voltage on overhead wires are studied respectively.