【作者】 许杨；

【导师】 张小青；

【作者基本信息】 北京交通大学 ， 高电压与绝缘技术， 2008， 硕士

【摘要】 随着我国电力工业的发展和城镇规模的不断扩大,进入城镇的输电线路电压等级不断提高,高压、超高压输电线路电磁污染对城市以及长期居住在沿线附近居民的影响引起了社会各方面的关注。利用以镜像法为基础的等效电荷法,建立了高压输电线路工频电场的一般数学模型,该模型适用于空旷地带且档距较小的高压输电线路工频电场计算。通过Matlab编制的仿真程序对算例进行了仿真分析,总结了地面附近工频电场的分布规律。考虑线路正常运行时避雷线的影响,在此模型上建立了高压输电线路带避雷线的工频电场数学模型,结合算例分析了避雷线对高压输电线路工频电场的影响。考虑到大档距的架空线存在较大的弧垂,提出了架空线的悬链线模型,建立了基于悬链线模型的高压输电线路工频电场数学模型,并结合矩量法对其进行了求解。通过对算例的仿真分析,总结了在此模型下地面附近工频电场的分布规律,即工频电场的分布具有一定的三维性,沿输电线路长度方向电场分布有所不同。利用安培环路定律,建立了架空输电线路工频磁场的一般数学模型,通过对算例的仿真分析,总结了地面附近工频磁场的分布规律。考虑到大档距下架空线存在较大弧垂,结合毕奥一沙伐定律与架空线悬链线模型,建立了基于悬链线模型的工频磁场数学模型,通过对算例仿真,分析了地面附近的磁场分布规律,即工频磁场的分布具有一定的三维性,沿输电线路长度方向磁场分布有所不同。结合环境评估标准,通过算例与仿真,分析了导线排列形式、导线对地高度、导线运行方式、多回不同电压同杆并架、不同地面情况以及屏蔽线等不同影响因素或情况下的工频电磁场分布规律,探讨了减小工频电场的措施。通过Visual C与Matlab混合编程,开发了输电线路工频电磁环境仿真软件,实现了友好的人机界面。更多还原

【Abstract】 With the development of electric power industry and the expansion of cities and towns, the voltage rank of transmission lines into cities and towns is continuously raised. People are paying increasing attention to the influence of electromagnetic field of such high voltage and ultra-high voltage transmission lines.This paper makes a reaseach on the mathematic model of power-frequence electric field of high voltage transmission lines by means of the Equivalence-charge Method based on image method. By the emulation and analysis with Matlab, a summarization is made on the distribution pattern of power frequence electric field. At the same time, the effect of lighting wire is also analyzed.Taking the sag of overhead lines into consideration, the paper bases the mathematic model on funicular curve model. Then the distribution pattern of electric field is studied, which is based on such mathematic model. The electric field based on such mathematic model is three-diemensional.After that, the paper makes a reaseach on the mathematic model of power frequence magnetic field of high voltage transmission lines by means of Ampere circuital theorem, and the distribution pattern of power frequence magnetic field is summarized. Taking the sag of overhead lines into consideration, the paper bases the mathematic model on funicular curve model, as well as the Biot Savart law of power frequence magnetic field. The magnetic field based on such mathematic model is also three-diemensional.By emulation and analysis combined with the environmental evaluation standard, some factors affecting the power frequence electric field and magnetic field are analyzed at the same time, such as conduction wire arrangment, height, different phase, double power supply circuit on a single pole, case of slant ground, and shield lines. The paper studies on the measures, which should be taken to impair the power frequence electric field.Emulation software of power frequence electromagnetic field of transmission lines is developped with Visual C and Matlab.更多还原