特高压输电线路杆塔雷电流分布的仿真  

Simulation of Lightning Current Distribution in Towers of Ultra-high Voltage Transmission Lines

作　　者：李伟[1] 向常圆 文习山[1] 戴敏[2] 李志军[2] 段次祎 

机构地区：[1]武汉大学电气工程学院,武汉430072 [2]中国电力科学研究院,武汉430074 [3]国网湖北省电力公司武汉供电公司,武汉430050

出　　处：《高电压技术》2016年第8期2642-2650,共9页High Voltage Engineering

基　　金：国家自然科学基金(51507119)~~

摘　　要：为了更深入掌握雷击特高压(UHV)输电线路杆塔时雷电流分布的特性,对特高压输电线路杆塔雷电流分布进行了仿真。首先建立了简化的2层杆塔模型,使用矩量法(MOM)进行了雷电流分布计算并通过了实体模型的试验验证。然后在此基础上,根据实际参数建立了特高压输电线路猫头塔的仿真模型,分别就4种雷电流波形和3种不同雷击位置情况下杆塔内的雷电流分布进行了仿真计算。结果表明:雷电流波形越平缓,通过避雷线流向其他杆塔的电流就越多,反之亦然;波前时间的上升导致斜撑流过的电流比例增大;雷击点的改变对雷击点附近的电流分布影响极大并将改变部分导体内电流的方向,但随着导体与雷击点间距离的增加,导体上通过的雷电流受雷击点位置的影响减小,且雷电流分布随着该距离的增加而趋于均匀;杆塔内不同部分的雷电流峰值时间不同,将其幅值直接求和得到的结果大于注入的雷电流总幅值。该研究工作加深了对雷击特高压输电线路杆塔时雷电流分布特性的认识,也为雷电流监测装置的安装提供了参考。In order to further study the distribution characteristics of the lightning current through ultra-high voltage （UHV） transmission line tower, this paper simulated the current distribution when lightning striking the UHV transmission line tower. Firstly, a simplified model of a tower with a two-layer structure is established. Its characteristic under lightning stroke is analyzed based on the method of moment （MOM）. The validity of the calculation is verified by the measured results of test model. On this basis, the simulation model of the cat-head type tower of UHV transmission lines was established according to the actual parameters. Its current distribution is simulated for four different injected lighting current waveforms and three different lightning strike locations are taken into consideration. The simulation results show that the more gently the lightning current waveform is, the more currents flew to nearby towers through overhead ground wire, and vice versa. The rising of the wave front time makes current through the diagonal brace larger. Lightning striking point has significant effect on the current distribution around the lightning striking point and will change the direction of current flowing through certain conductors. However, as the distance between a conductor and a lightning striking point increases, the effect caused by the lightning striking point location becomes less obvious, and the lightning current distri- bution tends to be more uniform. Simulation results also indicate that the lightning current located at different part of the tower differs in phase angle, and the sum of amplitude is greater than amplitude of the lightning current injected. The re- search can contribute to further understanding of distribution characteristics of lightning current through UHV transmission line tower. Moreover, it can provide references for installation of monitor device of lightning current distribution.

关 键 词：雷电 矩量法 MOM 特高压 UHV 输电线路 雷电流分布 猫头塔 

分 类 号：TM75[电气工程—电力系统及自动化] TM863