短波频段高压输电线路的电磁散射场及其影响因子

Electromagnetic Scattering Field and Influencing Factors of High Voltage Transmission Lines in Shortwave Frequency Band

明确高压输电线路对邻近无线电台站电磁散射场的决定性影响因子,针对性地抑制干扰幅值,是解决当前输电线路无源干扰问题的最有效办法。为研究短波频段输电线路散射场的决定性影响因子,结合电磁散射理论,构建输电线路线-面混合模型,采用RWG基函数和伽辽金检验离散感应电流,并利用电场积分方程对散射场进行求解。通过输电线路感应电流与散射场之间的关联关系,分析了输电线路地线、线路档距、铁塔数量及铁塔高度等本体结构特征对感应电流的分布影响,间接确定了输电线路电磁散射场的影响因子。结果表明,电磁波视线下输电铁塔的复杂金属结构散射体是线路电磁散射场的重要影响因子。

Identifying the decisive influence factors of high voltage transmission lines on the electromagnetic scattering field of neighboring radio stations and suppressing the interference amplitude is the most effective way to solve the current transmission line passive interference problem. In order to study the decisive influencing factors of the scattering field of transmission lines in the shortwave frequency band, combined with electromagnetic scattering theory, a transmission line route-surface hybrid model is constructed. The RWG basis function and Galerkin are used to test the discrete induced current, and the scattered field is solved by the electric field integral equation. Through the correlation between the induced current of the transmission line and the scattering field, The influence of the main structural characteristics of the transmission line ground wire, line spacing, number of towers and tower height on the distribution of induced current is analyzed, and the influence factor of the electromagnetic scattering field of the transmission line is indirectly determined.The results show that the complex metal structure scatterer of the transmission tower is an important influence factor of the electromagnetic scattering field of the transmission line under electromagnetic wave.