灭弧间隙抑制35kV输电线路雷击过电压及谐波的仿真研究

Simulation Research on Arc-extinguishing Gap Suppresses Lightning Overvoltage and Harmonics of 35kV Transmission Line

为了解决雷击输电线路存在过电压及谐波问题,笔者团队研制出了一种新型灭弧防雷间隙(NALPG)。笔者从NALPG的熄弧原理入手,以广西钦州某35kV已装有NALPG的输电线路为背景,通过搭建实物等值电路并借助电磁暂态计算软件(EMTP)来分析装置熄弧之后的暂态过程。仿真结果表明:当50kA的雷电流击中杆塔塔顶时,相比于不安装NALPG的输电线路,安装NALPG能降低雷电反击工况下输电线路输入端91.57%的过电压,输出端53.7%的过电压以及故障端38.96%的过电压;并且有效减少雷击引起的输电线路电压总畸变率(THD)及高次谐波。

In order to solve the problem of over-voltage and harmonic in lightning transmission lines,the author′s team developed NALPG.Based on the arc extinguishing principle of NALPG.The author takes a 35kV transmission line equipped with NALPG in Qinzhou,Guangxi.Simulation results show that when 50kA lightning current hits the top of the tower,compared with the transmission line without NALPG,installation of NALPG can reduce the overvoltage 91.57% at the input,53.7% at the output end and 38.96% at the fault end under the lightning counterattack condition.Moreover,the transmission line THD and high order harmonics caused by lightning is effectively reduced.