雷击输电线路杆塔时的杆塔等效模型  

Equivalent Model of Transmission Tower Under Lightning Striking

作　　者：杜林[1] 糜翔[1] 杨勇[1] 杨庆[1] 

机构地区：[1]重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆400030

出　　处：《高电压技术》2011年第1期28-33,共6页High Voltage Engineering

基　　金：国家重点基础研究发展计划(973计划)(2009CB724504)~~

摘　　要：为了对雷击杆塔时的波过程进行分析,研究了杆塔的等效模型。基于圆锥天线的相关理论,研究了杆塔单一支柱的等效波阻抗模型。结合实际杆塔结构,将杆塔视为4导体系统,在垂直单导体等效阻抗基础上乘以修正系数即得到实际杆塔等效阻抗。结合波阻抗定义式,引入了4导体系统等效阻抗修正系数,其中包括电感及电容修正系数,电感修正系数由黎曼公式计算,电容修正系数由4导体系统与垂直单导体四周电场分布情况比较得到。按照得出的杆塔等效阻抗模型对500kV等级杆塔进行计算。In order to analyze the wave process of the transmission tower struck by lightning,the equivalent model of a transmission tower was studied.Based on the correlative theory of taper antenna,the equivalent wave impedance model of a single tower stanchion was also studied.Firstly,the tower was regarded as a four-conductor system in consideration of the fact configuration of a tower,the equivalent wave impedance of the four-conductor system was derived from a single vertical conductor.Secondly,considering the definition of wave impedance,the compensation factor of the four-conductor system was introduced,including compensation factor of inductance and compensation factor of capacitance.Finally,the compensation factor of inductance was calculated by the Riemann formula,and the compensation factor of capacitance was obtained from the surrounding condition of electric field distribution of the four-conductor system and the single vertical conductor.Moreover,the equivalent impedance of four-conductor system was elicited by multiplying the compensation factor with the equivalent impedance of a single vertical conductor,so the equivalent impedance of the tower was found.A 500 kV tower was calculated using the equivalent impedance model of the tower.

关 键 词：雷击 波阻抗 圆锥天线 电感修正系数 电容修正系数 杆塔模型 

分 类 号：TM753[电气工程—电力系统及自动化]