±1100kV直流输电线路地面合成电场分析

摘要

±1100kV特高压直流输电工程是全新的技术领域,其电磁环境影响问题备受公众关注.采用解析计算法对±1100kV直流输电线路产生的地面合成电场强度进行了理论计算,并将结果与已建±800kV和±500kV直流输电线路的实测值进行比较.结果表明,当±1100kV线路最低线高为26~32m时,极导线水平排列线路产生的地面合成电场强度最大值为12.13~17.00kV/m,极导线垂直排列线路产生的地面合成电场强度最大值为12.76~13.59kV/m.在最低线高相同的情况下,通过采取增大导线截面、增加导线分裂数等措施后,±1100kV线路产生的合成电场水平与±800kV线路、±500kV线路相比并没有明显增大.%±1100kV UHV DC power transmission project is a new technology field, whose impact of electromagnetic environment receives great attention.In this paper, the levels of ground total electric field (GTEF) of ±1100kV DC transmission line were calculated by Analytical Calculation Method, and the results were compared with the measurement results of ±800kV and ±500kV DC transmission lines.As the results shown, at the lowest line heights of 26~32m, the max levels of GTEF of ±1100kV lines (pole conductors horizontal arrangement) range from 12.13 to 17.00kV/m, and the max levels of GTEF of ±1100kV lines (pole conductors vertical arrangement) range from 12.76 to 13.59kV/m.By taking measures of increasing the section and split number of conductor, the level of GTEF of ±1100kV line does not increase significantly compared with ±800kV lines and ±500kV lines when the lowest line heights are identical.