500kV同塔双回紧凑型输电线路电磁环境分析

Analysis on Electromagnetic Environment of 500 kV Compact Transmission Line with Double Circuits on the Same Tower

为了有效分析500 kV同塔双回紧凑型输电线路周围电磁环境。文中将模拟电荷法与矩量法相结合进行电场计算,采用毕奥—萨瓦定律进行磁场数值,采用激发函数法及美国BPA推荐的预测法进行可听噪音、无线电干扰计算。研究了500 kV同塔双回紧凑型线路不同子导线类型、导线相间距、下相导线最低高度下的电磁场强度、可听噪音、无线电干扰。研究结果表明:为满足线路下方电磁环境要求,邻近民房下相导线最低点对地高度不低于16 m,通过公众容易接触和跨越公路的地区下相导线最低点不低于12 m,跨越农田下相导线最低点对地高度不低于10 m;导线相间距建议取6.7 m。研究结果为500 kV同塔双回紧凑型线路的设计提供参考。

To effectively analyze the electromagnetic environment of 500 kV compact transmission lines with double circuits on the same tower,the charge simulation method and the moment method are combined to calculate the electric field,Biot-SaUart principle is employed to calculate the magnetic field, and the excitation function method as well as the BPA-recommended prediction method is adopted to calculate the audible noise and radio interfer- ence.As a result,the electric and magnetic field strength,audible noise and radio interference of the 500 kV compact transmission line with different sub-conductor types,phase spacing and the lowest height of lower phase conductor are obtained and analyzed.Results show that in order to meet the requirements for the electromagnetic environment under the transmission line,the smallest height of the lower phase conductor adjacent to houses ought to be not less than 16 m, in public area and across-road area the smallest height of the lower phase conductor ought to be not less than 12 m,the smallest height of the lower phase conductor across farmland ought to be not less than 10 m, and the spacing of phase conductors is recommended 6.7 m.