特高压直流线路的场分布影响因素分析

Influence Factor Analysis of the Field Distribution around the Ultra-HVDC Line

线路附近地面的场分布是输电线路电磁环境中的一个重要指标。首先验证了半经验公式法的有效性。然后使用该方法分析了极导线水平排列的±800 kV直流线路合成场强、标称场强和离子流密度的影响因素和变化规律。研究表明地面,标称电场强度受线路对地高度的影响很大,而合成电场强度和离子流密度除受导线对地高度的影响较大外,受导线直径和分裂数的影响也很大。

The field distribution on the ground near the transmission line is an important index to evaluate the electromagnetic environment. In this paper, the validity of the semi-experiential formulas to calculate the total electric field and the ion current density is testified. The influencing factors of the field distribution under the uhra-HVDC line are analyzed. It can be seen that the variation rules of the total electric field and the ion current density are quite different from that of the nominal electric field. The nominal electric field is greatly influenced by the height of conductors. However, the total electric field and the ion current density only greatly are not influenced by the height of conductors, but influenced by the diameter and the number of the sub-conductors.