特高压架空输电线子导线不同排列下场强仿真研究

降低分裂导线表面和周围场强,可以减小特高输电线下方电场对生态环境的危害。首先选取有限元法建立模型,计算架空输电线表面和周围场强;其次通过有限元法,计算子导线异型排列下的最大相导线表面平均场强、线下距地1 m处的最大场强和走廊宽度;最后对比分析数据,得出子导线椭圆长轴水平排列优于子导线圆形排列的结论。此仿真结果表明：倒三角架空线路八分裂子导线按水平椭圆排列可降低最大相导线表面平均场强、线下距地1 m处的最大场强和走廊宽度。研究结果若应用于架空输电线路中,可减小电晕损耗、无线电干扰水平和可听噪声,同时杆塔高度也可适当降低。

Simulation Study on Electric Field Intensity of UHV Overhead Transmission Lines with Different Arrangements

In order to lower the surface EFI of the sub-conductor and reduce the corridor width of overhead transmission lines, a simulation study is conducted. Firstly, a model is established with FEM to calculate the EFI on and around the surface of overhead transmission lines. Secondly, the FEM is used to calculate the average EFI on the surface of the maximum phase conductor under unsymmetrical configuration, the maximum EFI at the level of one meter to the ground under the line, and the corridor width. Finally, it is found though a comparative data analysis that the horizontal elliptical configuration of sub-conductors is superior to the circular configuration. The simulation results show that the horizontal elliptical configuration of eight-bundle conductors with inverted triangular layout can reduce the average EFI on the surfaces of the maximum phase conductor, the maximum EFI at the level of one meter to the ground under the line, and the corridor width. When used in overhead transmission lines, this configuration can reduce the corona loss and the level of radio interference and audible noise as well as the tower height.