架空输电导线表面电场的计算方法和分布规律  

Calculation Method and Distribution Laws of Electric Field on Surface of Overhead Transmission Line

作　　者：杨勇[1] 刘元庆[2] 吴桂芳[2] 陆家榆[2] 鞠勇[2] 

机构地区：[1]河南工业大学电气工程学院,郑州450001 [2]中国电力科学研究院,北京100192

出　　处：《高电压技术》2015年第5期1644-1650,共7页High Voltage Engineering

基　　金：北京市自然科学基金(3142022);北京市科技新星计划资助(2015A072)~~

摘　　要：研究特高压直流输电线路采用型线时导线表面电场的计算方法和分布规律,有助于提高该种线路经济效益并改善其电磁环境。根据型线的圆弧形表面特征,提出了一种计算其表面电场的方法,对该方法的有效性进行了验证。计算结果表明:型线的最大表面电场强度位于其外层铝线表面大圆弧和小圆弧的相交点附近且稍微偏向小圆弧一侧;型线的最大表面电场强度约为同外径圆绞线的0.88倍、光滑导线的1.23倍,且这2个数值基本不受导线半径、外层铝线数和导线分裂数的影响。根据计算和分析结果可认为:相对于圆绞线,同等条件下的型线最大表面电场强度较小,表面相对光滑,采用型线时特高压直流输电线路的电磁环境水平较优。Studying the calculation method and distribution laws of the electric field on the surface of the conductor when the shaped wire is adopted by UHVDC transmission lines will help increase the economic efficiency and improve the electromagnetic environment of this type of lines. According to the surface characteristics of the circular arc of the shaped wire, we proposed a calculation method for the electric field on the surface of this type of wire, and verified the validity of this method. The computation results show that the maximal electric field on the surface of the shaped wire lies near the convergence of the bigger arc and the smaller arc on the surface of outer aluminum wire and slopes slightly to the side of the smaller are. For the same radius, the maximal electric field on the surface of the shaped wire is about 0.88 times as that of the round stranded wire and 1.23 times as that of the round smooth wire, and the two values are basically unaf- fected by the radius of wire, amount of outer aluminum wires and splitting number of wire bundle. According to calculation and analysis results, some conclusions are drawn as follows. Compared with the round stranded wire, under the same conditions, the maximal electric field on the surface of the shaped wire is smaller and its surface is smoother, so the electromagnetic environment level of UHVDC transmission lines is better when the shaped wires are adopted.

关 键 词：型线 圆绞线 电场 圆弧 粗糙系数 电磁环境 

分 类 号：TM751[电气工程—电力系统及自动化]