特高压输电线路下方工频电磁场的研究

以前苏联特高压输电线路为模型，利用CDEGS软件包对影响线路下方地面以上的工频电场的对地高度、相间距离、分裂导线的根数、分裂间距、子导线直径等各种因素进行了仿真，得出升高相导线对地高度、减小相间距离、减少分裂根数、缩短分裂间距、选择小截面子导线均可以减小地面场强，其中提高输电线路对地高度的效果最明显。另外，还提出在相导线与地面之间安装屏蔽线的方法，并对架设2、3、5和7根屏蔽线的情况进行了仿真，仿真结果表明安装屏蔽线能明显地减小地面场强。

Study on the power frequency electromagnetic field under UHV transmission lines

The paper models on the real UHV transmission lines of former Russia, and simulates the influence of the height of phase conductors, wire spacing, the number of split conductors, spacing of split conductors and the diameter of the subconductors on the electric field due to UHV transmission lines at ground level using the CDEGS software package. Results show that rising the height of phase conductors, decreasing wire spacing, reducing the number of split conductors, shortening the spacing of split conductors and selecting smaller section of subconductors can all reduce the electric field at ground level, of which rising the height of phase conductors has the best effect. Then the paper also put forward the reduction method of installing extra shield wires beneath the power lines. And the cases of installing 2, 3, 5 and 7 shield wires were simulated. Results show this method can obviously reduce the electric field at ground level.