三相传输线产生的旋转电场  

Rotary Electric Field of Three-phase Transmission Lines

作　　者：梁振光[1] 董霞[1] 孟昭敦[1] 

机构地区：[1]山东大学电气工程学院,济南250061

出　　处：《高电压技术》2006年第10期50-52,共3页High Voltage Engineering

摘　　要：为了解三相传输线电场的旋转特性,在计算三相传输线电场的基础上分析了它的旋转规律。首先按无限长平行细长导线推导空间任意点电场强度的表达式,并针对等边三角形排列的三相传输线给出三角形中心、三角边中点、三角形外接圆上等位置点的具体表达式,它们分别显示圆、椭圆、直线等几何轨迹;然后用数值方法计算了任意三角形排列及直线排列的三相传输线电场,绘制其几何轨迹。计算结果显示三相传输线产生椭圆旋转电场,传输线周围分为旋转方向相反的两区域,其分界线上的电场是直线脉动的。传输线三角形排列时分界线是三角形的外接圆;直线排列时分界线是其连接直线。电场的旋转特性会对无向电场测量结果产生一定影响。In order to know rotation characteristic of three-phase transmission lines, analytical and numerical method are used to calculate electric field of three-phase transmission lines. Firstly, expression of electric field strength in an arbitrary point was deduced according to parallel infinite length lines. Equilateral triangle arranged three-phase transmission lines were taken as an example. Expression on geometrical center, middle points of triangle edges and points on outer-connected circle of the triangle, etc. were given. They indicated tracks of circle, ellipse, line, etc. Secondly, numerical method was used to calculate electric field of arbitrary triangle arranged and line arranged transmission lines. Tracks of electric field were drawn. Calculation results reveal that three-phase transmission lines produce ellipse rotated electric field. Area around transmission lines can be divided into two regions. Electric fields on the boundary of the two regions indicate pulsatory linear trace. For triangle arranged transmission lines, the boundary is outer-connected circle of the triangle. For line arranged transmission lines, the boundary is connecting line of the three lines. The rotation characteristic of electric field has certain influence on measurement results when using non-directional method.

关 键 词：传输线 电场 三相 旋转 测量 

分 类 号：TM15[电气工程—电工理论与新技术]