架空配电线路感应雷过电压仿真分析  

Simulation and Analysis on Lightning Induced Overvoltage of Overhead Distribution Lines

作　　者：刘金亮[1] 杨彩梅[1] 林国华[2] 

机构地区：[1]中原油田生产管理处,河南濮阳457001 [2]中原油田分公司采油二厂,河南范县457532

出　　处：《电瓷避雷器》2012年第4期43-48,共6页Insulators and Surge Arresters

摘　　要：架空配电线路绝缘水平较低,因此雷电感应过电压引起的雷击跳闸率很高。为了分析配电线路感应雷过电压的特性,介绍了感应过电压的计算方法,使用二阶时域有限差分法(FDTD)计算感应过电压,以实际线路为例,分析了线路结构、雷电流参数、大地电导率及负载对感应过电压的影响。结果表明,线路高度的增加会使感应过电压增大;雷电参数对感应过电压计算结果影响较大;当大地电导率小于,其对感应过电压的影响不可忽略,计算分析时应予以考虑;需要对短时呈容性的设备做好防雷保护工作。The insulation level of overhead distribution lines is relatively low, thus the lightning trip-out rate caused by lightning induced overvoltage is very high. In order to analyze the characteristics of lightning induced overvoltage of overhead distribution lines, the calculation method of lightning induced overvoltage is introduced, and computing method for the lightning induced overvoltage is introduced, using the 2nd order Finite-Difference Time Domain method and taking the actual line as an example, the effect of line structure, lightning current parameters, grounding conductivity and load on lightning-induced overvoltage are analyzed.The results show that the induced voltage increase with line height; and the influence of lightning parameters on induced voltage is remarkable; when the ground conductivity is less than 0.1 S/m, its influence on induced voltage can not be neglected, and should be considered in the calculation and analysis of lightning induced voltage; More lightning measures should be taken to the equipment present capacitive in short time.

关 键 词：架空配电线路 感应雷过电压 二阶时域有限差分法 影响因素 

分 类 号：TM75[电气工程—电力系统及自动化]