【作者】 陈仕姜；

【导师】 林韩； 林军；

【作者基本信息】 福州大学 ， 电力系统及其自动化， 2006， 硕士

【摘要】 随着人们生活水平的提高和科学技术的发展,各行各业对电力的需求迅速增长。为了满足远距离、大容量输电和联网的需要,超高压输电目前已经广泛使用。在输电电压提高的同时,输电技术在电磁环境方面受到了严峻的考验,输电线路的电磁环境问题越来越受到人们的关注,因此如何降低高压输电线路周边的电场强度已经成为环境保护和电磁兼容技术领域中一个焦点问题。本文在电磁场原理的基础上,对超高压输电线下的电场强度进行了计算; 自行编制了计算电场强度值的程序,计算分析了超高压输电线场强值的影响因素:包括导线高度及相间距离的影响,分裂导线的根数、间距和导线直径的影响,导线分布形式的影响,以及屏蔽线对场强值的影响。另外,由于物体的介入,电场会发生了畸变,特别是输电线路附近的建筑物使输电线路周边的电场畸变。针对畸变场,本文介绍了两种求解场强方法:(1)有限元法; (2)模拟电荷法。并引入了模拟电荷法分析软件,对畸变场进行计算。文章还对500kV某实际线路#3-#4塔进行模拟试验、建模,分析降低场强的方法与措施,特别是对于已经投入运行的线路而言,可以通过实施架设屏蔽线的方案来降低其周边的场强值。还在现场实施现场架设屏蔽线的方案,从屏蔽前与屏蔽后场强值对比表,可以看出屏蔽效果明显,场强值得到了大幅度的降低,从而验证了架设屏蔽线方案的可行性。文中还简单阐述了当前国内外工频电磁场环境效应的研究情况,特别是电磁兼容性方面的研究情况。最后还提出减缓暂态电击的对策。更多还原

【Abstract】 With the improvement of the living standard and the development of technology, the demand for electric power in every walk of life increases rapidly. In order to meet the need of long-distance and large-capability electricity transmission, the extra-high tension electricity transmission lines are widely used. But at the same time, the technology of electric transmission in electromagnetic environment was given a hard test. And more and more attention has been raised to the pollution of electromagnetic radiation produced by transmission and distribution line. Therefore, how to reduce the electric-field intensity produced by high voltage transmission lines has been a hot issue in the environmental protection and the field of Electromagnetic Compatibility Technology. Based on the theory of electromagnetism, it has calculated the electric field intensity under the extra-high tension electricity transmission lines in this paper. And a program has been written to calculate the electric field intensity as well as to analyze the influential factors of intensity of extra-high tension electricity transmission lines, which include the influence of the height of lead wires and the interphase’s distance, the influence of divided conductor number, space length and diameters of the lead wires and the influence of conductor pattern and density of field after shield wires are spanned along the transmission lines. In addition, the intervention of other objects will make the electric field aberrant,especially electric field around the transmission lines nearby the buildings. Two ways are worked out in the paper to calculate the density of the perturbed field,namely the finite-element method and the charge simulation method. And the paper applies the analyzing software of the charge simulation method to calculate the density of the perturbed field. In this paper, a simulation experiment of an actual 500 kV transmission lines between tower ~#3、~#4 has been made to model and analyze the way to reduce the electric field. especially to the transmission lines that are used,it founds that the density of field around the wire lines can be reduced by spanning shield wires along the transmission lines, Which has put into practice. From the table, the comparison of the density before and after adding one shield wire is distinct that the electric-field intensity has sharply reduced. So the feasibility of spanning shield wires along the transmission lines is proved. It also presents the current research on environmental effects caused by electromagnetic field in and out of the country, especially in the respect of electromagnetic compatibility. Finally, it puts forward the countermeasure to mitigate transient electric tip and run.更多还原