考虑空气湿度影响的特高压直流线路离子流场研究

Study on the Influence of Air Humidity on the Ion Current Field of UHVDC Transmission Line

随着特高压直流输电线路的建设,线路引起的电磁环境问题也受到广泛关注。线路附近的合成电场和离子流密度是评价电磁环境的两个重要指标。我国西南地区水电资源丰富,建设特高压直流输电线路将电能输送到负荷中心具有很高的经济效益。然而,西南地区较高的空气湿度是影响电磁环境的重要因素。为了得到受空气湿度影响的特高压输电线路地面离子流场的分布规律,建立考虑空气湿度影响的离子流场计算模型,研究不同空气湿度下特高压直流输电线路离子流场的分布规律。计算结果表明:在空气湿度影响下,随空气湿度增加地面合成场强和离子流密度幅值都有不同程度增大,合成场强的增长幅度非常显著,而离子流密度的增长幅度很小,基本可以忽略。

With the construction of UHVDC transmission lines,the electromagnetic environment caused by the line is also widely concerned.The synthetic electric field and ion current density near the line are two important indexes to evaluate the electromagnetic environment. China＇s southwestern region is rich in hydropower resources,the construction of UHVDC transmission lines to the power supply to the load center has a very high economic efficiency.However,the higher air humidity in the southwest is an important factor affecting the electromagnetic environment. In order to obtain the distribution law of the surface ion current field of the UHV transmission line affected by the air humidity,an ion current field calculation model considering the influence of air humidity was established to study the distribution law of the ion current field of the UHVDC transmission line under different air humidity. The results show that under the influence of air humidity,the field strength and the ion current density increase with the increase of air humidity,and the growth rate of the combined field strength is very significant,and the growth rate of ion current density is very small can be ignored.