屏蔽线参数对直流输电线路离子流场的影响

随着特高压直流输电线路的建设和投运,线路电晕引发的电磁环境问题受到广泛关注。为此,基于Kaptzov假设,考虑正、负离子的扩散作用,建立了特高压直流输电线路离子流场数值仿真模型,分析了屏蔽线高度与半径对离子流场的影响规律。结果表明,屏蔽线对直流输电线路下方的合成场强和离子流密度具有一定的屏蔽作用,且屏蔽线电晕放电有助于增强屏蔽效果。在实际工程应用中,屏蔽线高度的增加或屏蔽线半径的减小,均会使得电晕程度增强,从而使屏蔽作用显著增强,最大屏蔽效果可增加10%~20%。研究成果可为制定输电线路超标治理方案提供参考。

Influence of Shield Wire Parameters on Ion Current Field of DC Transmission Lines

With the construction and commissioning of ultra-high voltage direct current transmission lines, electromagnetic environment problem caused by line corona has received extensive attention. Based on the Kaptzov hypothesis, considering the diffusion of positive and negative ions, a numerical simulation model of the ion current field of UHVDC transmission line was established. And the influence of height and radius of shield wire on the ion current field was analyzed. The results show that the shield wire has a certain shielding effect on the total electrical field and ion current density under the DC transmission line, and the corona of shield wire helps to enhance the shielding effect. In practical engineering applications, the increase in the height of the shield wire or the reduction in the radius of the shield wire will increase the degree of corona, thereby significantly enhancing the shielding effect, and the maximum shielding effect can be increased by 10%-20%. The research results can provide reference for formulating treatment scheme of transmission lines above the mark.