500 kV超高压输电线下山坡周围工频电场分析  

Simulation analysis on the frequency electric field of slope under 500 kV EHV power transmission lines

作　　者：李永明[1] 杨骏[1] 邹岸新[2] 王洋洋[1] 徐禄文[2] 付志红[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400044 [2]国网重庆市电力公司电力科学研究院,重庆401123

出　　处：《电测与仪表》2017年第6期30-36,共7页Electrical Measurement & Instrumentation

基　　金：国家自然科学基金资助项目(51277189)

摘　　要：在输电线下电场的计算中,普遍将输电线下地面视为平地,而忽略了不规则地面对输电线下电场计算的影响。为此建立了山坡周围工频电场的计算模型,基于模拟电荷法分析了平地及山坡表面的电场分布,并分析了影响山坡周围电场分布的因素。研究表明,山坡对输电线下电场分布有明显影响,电场在靠近山坡坡脚处逐渐减小,在随着山坡高度的增加而逐渐上升,在坡顶处电场发生畸变。山坡的角度、高度、输电线与山坡的相对位置及输电线的剖分密度对其周围电场计算都会产生影响,角度越大,高度越高,在山坡顶部电场的畸变越明显。输电线与山坡之间的夹角越大,在坡脚处电场减弱的趋势越明显。The transmission line mostly treats the ground which is under the lines as the ground in the electric field calculation,so that ignores the influence of irregular ground to the electric field calculation. Thus,a three-dimension model to compute power frequency electric field surround the slope under the transmission line is built. According to charge simulation method,the distribution of power frequency electric field at ground and slope surface is analyzed,and the factors impacting computational results of electric field are discussed. Research results show that there is a great impact on ground surface electric field nearby the slope. The effect is that close to slope toe,the power frequency electric field of EHV transmission is weakened and the field is strengthened with the height of the slope become higher,and the electric field distortion appears at the top of slope. Computation result of electric field will be impacted by the angle and altitude of the slope,the position of the transmission line between the slope,the density of the simulation charge of the transmission line. The larger angle,the higher height of the slope,and the electric field distortion is become obviously.The angle of the slope and the power lines is more greater and the reducing of the electric field is more obvious.

关 键 词：山坡 工频电场 模拟电荷法 影响因素 

分 类 号：TM15[电气工程—电工理论与新技术]