安徽六安山区段高压输电线路的防雷能力研究

发布时间：2018-04-02 12:12

本文选题：山区　切入点：高压输电线路　出处：《华北电力大学(北京)》2017年硕士论文

【摘要】：输电线路是电力系统中的重要组成部分。随着我国电网技术的不断发展,电网网架不断调整和丰富,近年来,建成投运输电线路逐年增长,输电线路的运行安全越来越受到重视。统计数据表明,电力系统中的诸多事故都由输电线路故障引起的,而输电线路的故障又有很大部分是雷击造成的,而架设在山区的线路,该部分占的比例更大。本文针对山区防雷的几个关键技术问题进行了分析研究,并应用理论研究结果,以具有代表性的安徽六安文峰-古碑220k V线路工程为例进行了设计。在山区路径选择方面,以合理控制工程投资,有效提升线路安全运行水平为目的,在遵循属地规划部门批准的路径主体方案的基础上,深入分析沿线雷电气象、特征参数等基础数据,有效避让不良地质区段、优化高海拔线路条件,重点关注塔位的合理选取、易击区避让等因素。并结合当地多年输电线路的运行经验,分别对导线、地线、防舞、鸟害和绝缘配置等设计参数进行分析,并给出推荐的设计参数组合。在线路防雷设计方面,对杆塔进行地形地貌、地面倾角、海拔高程等特征参数统计分析,计算绕击跳闸率、反击跳闸率及雷击跳闸率;开展雷击闪络特性分析、差异化评估雷击闪络风险级别,甄选出沿线雷击闪络风险级别高的杆塔。针对雷击闪络风险级别高的杆塔差异化提出单侧安装可控避雷针、优化杆塔导线排列方式压缩杆塔全高、增设垂直接地体降低接地电阻、采用盘型绝缘子提升绝缘配置水平的防雷措施,提高线路运行可靠性。
[Abstract]:Transmission line is an important part of power system. With the continuous development of power network technology in China, the network structure is constantly adjusted and enriched. In recent years, the number of power transmission lines built and put into operation has increased year by year. More and more attention has been paid to the operation safety of transmission lines. The statistical data show that many accidents in power system are caused by transmission line faults, and most of the faults of transmission lines are caused by lightning strikes. In this paper, several key technical problems of lightning protection in mountainous areas are analyzed and studied, and the results of theoretical research are applied. Taking the typical Luan Wenfeng-Gubei 220kV line project in Anhui as an example, the paper designs the route selection in mountain area in order to reasonably control the investment of the project and effectively improve the safe operation level of the line. On the basis of following the main route plan approved by the territorial planning department, the basic data such as lightning meteorology and characteristic parameters along the line are deeply analyzed, the bad geological section is effectively avoided, the condition of high elevation line is optimized, and the reasonable selection of tower position is focused on. Combining with the operation experience of local transmission lines for many years, the design parameters such as wire, ground wire, dance prevention, bird damage and insulation configuration are analyzed respectively. The recommended design parameter combination is given. In the design of lightning protection, the characteristic parameters such as topography and geomorphology, ground inclination angle, elevation and so on are analyzed, and the tripping rate, counter trip rate and lightning tripping rate are calculated. The lightning flashover characteristic analysis is carried out, the lightning flashover risk level is evaluated differently, and the pole tower with high lightning flashover risk level along the line is selected. For the pole tower with high lightning flashover risk level, a controllable lightning rod is installed on one side. In order to improve the reliability of the transmission line, the total height of the tower is compressed by optimizing the arrangement of the conductor, the vertical grounding body is added to reduce the grounding resistance, and the lightning protection measures of the disk type insulator are adopted to enhance the insulation configuration level.
【学位授予单位】：华北电力大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM863

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