500kV同塔双回线路工频电场精细化仿真计算

Refined Simulation of Electric Field around 500 kV Transmission Line with Double Circuits on Same Tower

以一典型500 kV同塔双回线路为研究对象,采用三维CAD软件Solid Works建立铁塔精细化计算模型,分别对绝缘子串、均压环、联板等部件按实际尺寸进行等比例建模,运用有限元软件参数化建立导线模型,实现混合网格划分,获得了线路周围的三维电场分布。分析同相序、逆相序及异相序三种不同导线布置方式下的电场差异,结果表明,同塔双回线路在同相序布置时地面场强最大,采用逆相序排列可明显改善线路下方电场环境,距地面1.5 m处最大电场强度小于4 kV/m。

A typical 500 kV transmission line with double circuits on same tower was taken as an example, and applying three dimensional CAD software SolidWorks, a refined tower calculation model was established, with the factors such as insulator strings, grading ring and yoke plate taken into account. Applying finite element software, the three-dimensional electric field distribution under the transmission line was obtained with conductor model built by APDL and the whole model meshed by hybrid elements. The differences of electric field distribution was analyzed when conductors arranged in positive phase sequence, reverse phase sequence and heterogeneous phase sequence, results showed that electric field above ground reaches maximum in positive phase sequence, while the electromagnetic environment improved significantly in reverse phase sequence arrangement, with the maximum field strength of 1.5 m above ground less than 4 kV/m.