基于Wagner抵消场法的输电线感应过电压计算  

Calculation of Induced Overvoltage on Transmission Line Based on Wagner Field Cancellation Method

作　　者：张迅 曾华荣 李艳玲[2] 刘华麟 周海 黄君凯 

机构地区：[1]贵州电力试验研究院,贵阳550002 [2]贵州大学电气工程学院,贵阳550002

出　　处：《电瓷避雷器》2014年第5期105-108,115,共5页Insulators and Surge Arresters

摘　　要：由于使用条件的限制,规程法计算公式不能准确反映雷击杆塔塔顶时输电线路上的感应过电压。基于场抵消法理论,先计算雷击塔顶的单位方波响应,然后通过Duhamel积分求解任意雷电流波形下导线上的感应过电压。根据目前得出的主放电速度、上行先导与雷电流幅值的函数关系,利用MATLAB编写了雷击塔顶时输电线感应过电压的计算程序,获得了感应过电压的数值和随时间变化的波形,并总结了感应过电压幅值、时变特性及其影响因素和影响规律。Due to the restriction of application condition, the calculation formula in Regulation Method does not accurately reflect the induced overvoltage on the transmission lines when lightning strike on the top of tower. Based on the field cancellation method theory, in this paper, the unit step wave response when lightning strikes on the top of tower is calculated firstly; and through the Duhamel integral, the induced voltage on the wire under arbitrary lightning current waveform is then solved. According to the main discharge speed, function relationship of upward leader with lightning current amplitude currently, MATLAB is used to compile the calculation program of transmission line induced voltage when lightning strikes on the top of tower. The values of the induced voltages and their waveform as function of time, the induced voltage amplitude, time-variant characteristics and its influence factor and rule has been summarized.

关 键 词：Wagner场抵消法 雷击杆塔 雷击感应过电压 

分 类 号：TM751[电气工程—电力系统及自动化]