750kV超高压交流输电线路电磁环境研究

Electromagnetic environment study for 750 kV extra high voltage AC transmission lines

采用CDEGS软件包,对750 kV交流输电线路周围的电磁环境进行了仿真研究。以三相双回架空线路为模型,分析了导线对地高度、相序布置、分裂导线的根数、分裂间距、分裂导线子导线直径等因素变化对工频电场、工频磁场、无线电干扰和可听噪声的影响;提出了改善线路周围电磁环境的措施;根据工频电场的限值划定线路走廊的宽度;并分别比较了大雨、湿导线和晴天时输电线路周围的无线电干扰和可听噪声。仿真结果表明影响750 kV输电线路电磁环境的主要因素是可听噪声和工频电场。

The CDEGS software package was used to simulate the electromagnetic environment of the 750 kV transmission line. Based on the three-phase double-circuit overhead transmission line model, the influences of the conductor-to- ground height, the conductor sequence, numbers and spacing of the split conductors, and the diameter of the sub-conductor on the power frequency electric field and magnetic field, the radio interference （ RI）, and the audible noise （AN） are analyzed. Measures to improve the electromagnetic environment are proposed. The power frequency electric field limits were used to determine the width of the line corridor, and the RI and AN under different weather conditions such as heavy rain, wet conductor, and fair weather are compared. Simulations show that the AN and the power frequency electric field are the major factors affecting the electromagnetic environment of the 750 kV transmission line.