特高压杆塔的非均匀传输线模型  

Non-uniform transmission line model of UHV tower

作　　者：余敬秋 徐政[1] YU Jingqiu;XU Zheng(Collegs of Electrical Enyneeeng, Zhejiang University, Hangzhou 310027, China)

机构地区：[1]浙江大学电气工程学院

出　　处：《电力工程技术》2019年第5期55-62,共8页Electric Power Engineering Technology

基　　金：国家电网有限公司总部科技项目“±1100kV换流站高频特性及高频滤波器优化研究”(0711-16OTL09413-001-007)

摘　　要：随着输电电压等级的提高,线路杆塔也越来越高,其从底部到顶部空间结构变化也越大。如果特高压杆塔仍采用多波阻抗模型,则不能反应其呼高的空间结构变化所产生的影响。文中首先介绍了杆塔的多波阻抗模型,然后指出多波阻抗模型的不足,再从杆塔物理结构出发搭建了杆塔简化的非均匀传输线模型。文中还将杆塔呼高用多段波阻抗模拟,研究杆塔呼高空间结构变化对其电磁暂态特性的影响。最后,对比了非均匀传输线模型和分段多波阻抗模型下杆塔的雷电电磁暂态响应,表明相比于多波阻抗模型,非均匀传输线模型更适用于特高压杆塔雷电暂态分析。As the transmission voltage level increases,the tower is also getting higher and higher,and its spatial structure changes from bottom to top greatly.The modeling of the Ultra-High Voltage(UHV)tower plays an important role in lightning protection analysis of transmission lines. The reliability of lightning protection analysis results depends on the accuracy of the UHV tower model. Moreover, as the voltage level increases, the height of the tower increases. If the multi-surge impedance model is adopted, it cannot reflect the influence of the spatial structure changes of the nominal height. Therefore, the non-uniform transmission line model is developed based on the physical structure of the tower. To study the influence of the tower’s spatial structure changes on its electromagnetic transient characteristics, the nominal height is modeled by several surge impendences. It is concluded that the more accurately the nominal height of the tower is modeled, the more accurately its electromagnetic transient response is reflected. Finally, the lightning electromagnetic transient responses of the tower with the non-uniform transmission line model and with the multi-segment multi-surge impedance model are compared and analyzed. It shows that compared with the multi-surge impendence model, the non-uniform transmission line model is more suitable for lightning transient analysis of UHV tower.

关 键 词：特高压杆塔 多波阻抗模型 非均匀传输线模型 防雷分析 杆塔电磁暂态响应 

分 类 号：TM72[电气工程—电力系统及自动化]