基于多脉冲回击电流模型的输电线路耦合过电压研究

Study on Coupling Overvoltage of Transmission Line Based on Multi Pulse Return Stroke Current Model

在常规的输电线路耦合雷电过电压研究工作中,通常只考虑回击电流只有一个脉冲的情况,而实际观测试验显示回击电流呈多个脉冲峰值逐渐削减变化,因此采用ATP-EMTP电磁仿真软件构建三个脉冲回击电流模型,研究导线耦合过电压变化趋势。研究表明,第一个脉冲作用下计算结果与国标结果相对误差为7.06%,验证所构建的算法的准确性,其次雷击点与架空输电线路距离在一定范围内,三个脉冲作用下导线耦合过电压差异性较大,随着雷击点与线路距离增加,过电压差异性相对较小。

In the conventional study of transmission line coupled lightning overvoltage,only one pulse of return stroke current is usually considered.However,the actual observation experiment shows that the return stroke current has multiple pulse peaks and gradually decreases.Therefore,in this paper,ATP-EMTP electromagnetic simulation software is used to build three pulse return stroke current models to study the change trend of the coupling overvoltage on the conductor.The results show that under the first pulse,the relative error between the calculation results and the national standard results is 7.06%,which verifies the accuracy of the proposed algorithm.Secondly,when the distance between lightning point and overhead transmission line is within a certain range,the difference of conductor coupling overvoltage under the action of three pulses is large.With the increase of the distance between lightning point and line,the difference of overvoltage is relatively small.