110kV输电杆塔的多波阻抗建模与雷击暂态响应分析  

Multi-wave impedance modeling and lightning strike transient response analysis of 110 kV transmission tower

作　　者：周利军[1] 黄林 王路伽 张栋 刘彬 徐晗[1] 陈斯翔 ZHOU Lijun;HUANG Lin;WANG Lujia;ZHANG Dong;LIU Bin;XU Han;CHEN Sixiang(School of Electrical Engineering,Southwest Jiaotong University,Chengdu 611756,China;Foshan Power Supply Bureau,Guangdong Power Grid Co.,Ltd.,Foshan 528000,China)

机构地区：[1]西南交通大学电气工程学院,四川成都611756 [2]广东电网有限责任公司佛山供电局,广东佛山528000

出　　处：《电力自动化设备》2020年第10期158-164,共7页Electric Power Automation Equipment

基　　金：广东电网有限责任公司科技项目(GDKJXM2018-2401)。

摘　　要：为准确分析输电杆塔的雷击暂态响应,精确建立杆塔的波阻抗模型显得尤为重要。通过双锥天线原理,建立垂直单根圆柱导体的波阻抗公式;考虑实际杆塔的倾斜因素和修正系数,利用ANSYS Maxwell进行三维电磁场仿真,建立主架、斜材的波阻抗修正系数与分段长度、等效半径、主架上/下间距的关系,并推导出主架、斜材的波阻抗计算公式。为反映雷电波在呼高部分的传播过程,将呼高部分细分为5段并完成建模。针对典型的110 kV同塔双回输电杆塔,利用ATP-EMTP暂态仿真软件进行建模分析,结果表明精细化建模进一步凸显了雷电波在杆塔中的折反射过程,与Hara无损线塔模型相比,杆塔电位波形变化基本一致,横担电位上升速度减慢,提前到达峰值且峰值降低,C相横担峰值相差9.6%,峰值时间超前了0.023μs,反映出了呼高部分的波过程以及对整个雷击暂态响应过程的影响。In order to accurately analyze the lightning strike transient response of transmission tower,it is very important to accurately establish the wave impedance model of the tower.Based on the principle of double cone antenna,the wave impedance formula of vertical single cylindrical conductor is established.Considering the tilt factor of the actual tower and the correction coefficients,the 3D electromagnetic field simulation is carried out by using ANSYS Maxwell to establish the relationship between the correction coef⁃ficients of the wave impedance of main frame and inclined material and the segment length,the equivalent radius and the top and the bottom distance of main frame,then the wave impedance formulas of main frame and inclined material are derived.In order to reflect the propagation process of thunder and light⁃ning wave in the high part,the high part is divided into 5 segments and the modeling is completed.The EMTP transient simulation software is used to analyze the typical 110 kV double-circuit transmission lines on the same tower.The results show that the refined modeling further highlights the process of lightning reflection and refraction in the tower,and compared with the Hara lossless tower model,the wave form change of pole-tower potential is basically the same,the rise speed of the crossarm potential slows down,the peak value of the cross-arm potential reaches ahead of time and the peak value decreases,the peak value difference of the cross-arm in phase C is 9.6%,and the peak time is 0.023μs ahead,which reflects the wave process of the high part and the influence on the transient response of the whole lightning stroke process.

关 键 词：雷击暂态响应 精细化建模 波阻抗模型 双锥天线 ATP-EMTP 

分 类 号：TM72[电气工程—电力系统及自动化]