文档介绍：输电线路的安全距离是特高压输电线路设计过程中需要考虑的关键因素。本文总结并分析了国内外特高压输电线路的相关研究成果,着重对输电线路的对地安全距离进行了研究。文中首先分别用几种不同方法探讨了各种不同的天气对于输电线路最大驰度的影响,在此基础上提出了以“最大地面电场强度限值”作为我国交流特高压线路导线最小对地距离的选取原则。进而基于逐步镜像法建立了特高压架空线下空间电场的数学模型,并以不同的电场控制指标来满足特定区域地面的控制要求,通过计算确定了1000kV级交流特高压单回和同塔双回输电线路导线在特定区域下的最小对地距离。探讨了线路相间距离、运行电压、导体布置形式、分裂导线结构和双回路相序布置方式等因素对导线最小对地距离取值的影响规律。
关键词:特高压输电线路;最大驰度;工频电场;对地距离
Abstract
The safe distance of the transmission line is a key factor to consider in the design
process of the UHV transmission lines. This paper summarizes and analyzes the related research es of the UHV transmission lines at home and abroad, and focuses on the safe distance of the transmission line to the ground. First, this article investigates a variety of weather impact for maximum relaxation of the transmission line in several different ways, on this basis; we make China's UHV AC Transmission Line to the maximum surface electric field strength limits "as the principle of a minimum conductor-to-ground distance selection. And then establish the mathematical model of the space electric field, which was based on the step-by-step method of mirror, under the UHV transmission line, and meet region-specific ground control requirements in different electric field control targets, calculate and determine the minimum distance of the 1000KV level UHVAC single back and the same tower back transmission Line in specific areas. This article investigate the influence of the line distance, operating voltage, conductor arrangement, the structure of the split line, and the phase sequence arrangement of the double-loop line.
Keywords: UHV transmission lines; maximum relaxation; frequency electric field; distance from the ground
目录
摘要 I
Abstract II
第1章绪论 1
特高压输电线路发展的背景与前景 1
国内外特高压研究和应用的现状 1
特高压电网的发展目标 2
特高压输电技术的应用范围及经济性分析。 2
当前发展特高压需要注意的几个技术问题 3
设计的任务和论文完成的主要工作 5
设计的任务 5
设计的主要工作 5
第2章导线最小对地距离的选取原则 6
国外导线最小对地距离的选取原则 6
国内导线最小对地距离的选取原则 7
小结 8
第3章架空导线发生最大弛度的气象条件确定 10