交流输电线路交叉跨越区域下方电场影响因素研究

Research on the influencing factors of electric field under AC transmission line crossover area

随着我国高压交流输电技术的快速发展,同时由于土地走廊的限制,高压交流输电线路建设不可避免地出现了交叉跨越的情况。高压输电线路产生的工频电场对近地面的人类活动有一定影响,且交叉跨越区域下方的电场分布较为复杂。鉴于现有文献只从一条观测路径来探讨各个因素对下方电场的影响,选取离地1.5 m高的平面内4条具有代表性的观测线来研究。利用Ansys有限元仿真软件建立交流输电线路交叉跨越区域三维空间模型,分别研究导线离地高度、相序、交叉角度、相位差、排列方式等因素对下方区域近地面1.5 m高度内电场强度的影响规律,并提出减小下方区域近地面电场强度的措施,达到有效降低交流输电线路交叉跨越区域下方电场的效果,也可为交叉跨越区域的线路设计规划提供一定参考。

With the rapid development of high-voltage AC transmission technology in China and the limitation of land corridors, the construction of high-voltage AC transmission lines cannot avoid the situation of crossing over.The power frequency electric field generated by high voltage transmission lines has a certain influence on human activities near the ground, and the electric field distribution under the crossover area is more complex.Since the existing literature only discusses the influence of various factors on the below electric field from one observation path, four representative observation lines in the 1.5 m plane are selected to be studied. Using Ansys finite element simulation software, a three-dimensional spatial model of AC transmission lines crossing and crossing region was established to study the influence rules of wire height, phase sequence, crossing angle, phase difference, arrangement mode and other factors on the electric field intensity within 1.5 m height near the ground in the lower region. Measures to reduce the intensity of the near-ground electric field in the lower region were proposed, and the effect of the electric field was effectively reduced under the crossing region of AC transmission lines, which can also provide some reference for the design and planning of the crossing region lines.