摘要
根据铁塔实际结构和导线抛物线方程,建立了铁塔附近三维电场计算模型。基于模拟电荷法分析了500 kV输电线路铁塔周围地面上的工频电场分布,分析了铁塔对其附近电场环境的影响,并讨论了影响电场计算结果的因素。研究结果表明:铁塔对其附近地面电场有一定屏蔽作用,电场强度在铁塔下方显著降低且在金属构架处产生畸变;铁塔的影响范围和铁塔高度及塔基尺寸有关;铁塔构架等效半径、线单元剖分段数以及铁塔不同简化模型都会影响计算结果。
Based on actual structure of power transmission tower and parabolic equation of transmission lines,a three-dimensional model to compute power frequency electric field at ground surface near transmission tower is built.According to charge simulation method,the distribution of power frequency electric field at ground surface near 500kV transmission tower as well as the impacts of transmission tower on nearby electric field is analyzed,and the factors impacting computational results of electric field are discussed.Research results show that there is a certain screening effect of transmission tower on ground surface electric field nearby the tower,so the electric field intensity beneath the tower decreases obviously and electric field distortion appears at the positions where metal frameworks are erected.The impacting area is related to the height of the tower and the size of tower foundation;computational result of electric field will be impacted by the equivalent radius of tower framework,the number of line segments and different simplified models of the tower.
出处
《电网技术》
EI
CSCD
北大核心
2013年第3期782-787,共6页
Power System Technology
关键词
三维铁塔模型
模拟电荷法
超高压输电线路
工频电场
three-dimensional transmission tower model
charge simulation method
EHV transmission line
power frequency electric field
