湿度风速对直流合成电场和离子流密度的影响

Effect of Humidity and Wind Speed on DC Total Electric Field and Ion Current Density

随着高压直流输电工程的持续发展,电压等级的不断提高,直流输电线路特有的离子流场问题已变得日渐突出,成为线路环境评估的重要指标之一,也成为线路设计时的主要制约因素。为此,建立了特高压直流输电线路离子流场数值仿真模型,分析了环境湿度、风速对离子流场的影响规律。研究表明,环境的相对湿度从25%增大到85%,地面合成电场强度减小7.2%,地面离子流密度减小21.0%,湿度对地面合成场强的影响程度较小,而对地面离子流密度的影响程度相对较大;在风的作用下地面合成电场强度和地面离子流密度曲线均有明显的偏移,其迎风侧的峰值减小,背风侧的峰值增大,风速过大可能会使背风侧的地面合成电场强度超标。

With the continuous development of HVDC transmission engineering and the continuous improvement of voltage level,the unique ion current field problem of DC transmission lines has become increasingly prominent,which has become one of the important indicators of line environmental assessment,and has become the main constraint in line design.For this reason,the paper established a numerical simulation model of the ion current field of UHVDC transmission line,and analyzed the impact of environmental humidity and wind speed on the ion current field.Studies show that the relative humidity of the environment increases from 25%to 85%,the ground total electric field decreases by 7.2%,the ground ion current density decreases by 21.0%,and the impact of humidity on the ground total electric field is small,while the impact on the ground ion current density is relatively large;Under the effect of wind,the ground total electric field and ion current density curve have obvious deviation,the peak on the windward side decreases while the peak on the leeward side increases;Excessive wind speed may cause the leeward side ground total electric field exceeding the standard.