±1100 kV直流输电线路地面合成电场分析

Analysis of ground total electric field of ±1100 kV DC transmission line

±1100 kV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±1100 kV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±800 kV和±500 kV直流输电线路的实测值进行比较。结果表明,当±1100 kV线路最低线高为26~32 m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12.13~17.00 kV/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12.76~13.59 kV/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,±1 100 kV线路产生的合成电场水平与±800 kV线路、±500 kV线路相比并没有明显增大。

±1100 kV UHV DC power transmission project is a new technology field, whose impact of electromag- netic environment receives great attention. In this paper, the levels of ground total electric field （GTEF） of ±1100 kV DC transmission line were calculated by Analytical Calculation Method, and the results were compared with the measurement results of ± 800 kV and ±500 kV DC transmission lines. As the results shown, at the lowest line heights of 26 -32 m, the max levels of GTEF of ±100 kV lines （pole conductors horizontal arrange- ment） range from 12. 13 to 17.00 kV/m, and the max levels of GTEF of ±1100 kV lines （pole conductors verti- cal arrangement） range from 12.76 to 13.59 kV/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 ± 500 kV lines when the lowest line heights are identical.