交流特高压输电线路线下电场强度改善措施研究

提高杆塔高度，即提高导线对地高度，是控制交流特高压输电线路地面电场的主要方式之一。由于特高压线路跨越距离长，若大范罔地提高杆塔高度，将会较大地增加工程成本。特别是在某些环境敏感区域，当杆塔高度降低以后，由于导线对地距离减小，地面电场强度增大，有可能超过国家相关标准。因此研究降低线路地面场强的措施，如架设接地屏蔽线等方法．是交流特高压工程中急需考虑的技术问题。主要针对屏蔽线的不同架设方式对线路地面电场进行计算研究，通过分析比较各种屏蔽线架设方案下的场强水平，提出最优的屏蔽线架设方案。

Measurements of Improving Electric Field under UHV AC Transmission Line

Increasing the height of the tower means increasing the height of the transmission line, which is one of the main methods to control ground electric field intensity of the UHVAC transmission line. Considering the long distance of UHVAC transmission lines, an increase of the tower height in a large scale results in material increase of the project cost. Especially in some environment-sensitive areas, with decrease of the height of the tower, ground electric intensity will be increased on account of decrease of the distance between transmission line and ground, causing a failure to meet the relevant national standard. Therefore, studies on how to lower the ground electric field intensity, such as adoption of the grounded overhead shield line, are badly needed in the UHVAC transmission line. The ground electric field intensity at different configurations of shielded lines is calculated in this paper, which gives the optimal conffiguration of shield lines through analysis and comparison of the ground electric field intensity at different configurations of shield lines.