摘要：加强输电线路的防雷设计不仅可以减少雷击输电线路引起的雷击跳闸次数，还有利 于变电站内电气设备的安全运行，是保证电力系统供电可靠性的重要环节。

本文研究了输电线路雷击放电的原理，阐述了雷电的形成与发展过程以及目前我国输 电线路防雷设计中常用的几种方法。对地区电网 220kV 架空输电线路遭受雷击跳闸的原因 进行了分析，找到了雷击跳闸线路的特点及存在的问题，并结合相关理论对 220kV 线路给 出了防雷改造措施。在 220kV 输电线路防雷研究中结合线路的地理位置重点讨论了如何降 低杆塔的接地电阻，给出了降低接地电阻的若干有效措施。最后通过具体的范例分析验证 了降低杆塔接地电阻能有效提高输电线路的耐雷水平，降低雷击跳闸率。75422

毕业论文关键词：输电线路，防雷设计，雷电参数，雷击跳闸

Abstract： Strengthen the transmission line lightning protection design can not only decrease the times of lightning transmission lines caused by lightning tripping, has proved to be within the substation electrical equipment safe operation, is an important link to guarantee the power supply reliability of power system。

This paper expounds the principle of transmission line lightning discharge, this paper introduces the formation and development process of lightning and the several methods commonly used in the design of transmission line lightning protection in our country。 For regional power grid 220 kV overhead transmission line lightning strike trip reasons are analyzed, and found the lightning tripping circuit characteristics and existing problems, and combined with relevant theory of 220 kV line lightning protection improvement measures are given。 In the study of 220 kV transmission line lightning protection combined with the geographical location of focus on the how to reduce the tower grounding resistance, several effective measures to reduce the mountainous area of grounding resistance is given。 Finally through the concrete  example analysis verified the reduce of the transmission line tower grounding resistance can effectively increase the lightning resisting level, reduce lightning trip-out rate。

Keywords: transmission line，lightning-shielding design，lightning parameters，lighting trip

目 录

1 绪论 3

1。1 输电线路防雷设计的重要意义 3

1。2 本文的主要内容 3

2 输电线路雷击放电的原理 4

2。1 雷电放电的发展过程 4

2。2 雷电相关参数 5

2。3 输电线路防雷计算 6

3 输电线路的防雷保护 12

3。1 输电线路防雷研究整体流程 12

3。2 输电线路防雷的具体措施 13

3。3 输电线路防雷保护的重点 14

4 220kV 输电线路雷击跳闸的现状及防雷措施的制定 14

4。1 220kV 输电线路雷击跳闸的现状