雷电参数及线路雷击跳闸运行分析.doc

PAGE PAGE 1 雷电参数及线路雷击跳闸运行分析 Analysis on Lightning Parameters and Lightning Trip-out Characters of Overhead Transmission Line ABSTRACT：The paper gives introduction on instances of lightning detection and lightning parameters, lightning trip-out and superposition, fault spot lookup of transmission line. Lightning intensity affecting lightning trip-out, and the correlation of lightning trip-out rate to ground flash density are analyzed. Key factors to lightning protection of transmission line such as corridor landform, grounding resistance of iron tower, lightning current magnitude, grounding wire protecting angle, insulator type are studied. The paper also analyzes lines operations of high lightning trip-out rate, and lightning protection instance of line arresters. Carrying out integrated reconstruction of lightning protection, advancing lines design standard, strengthening management of relay protection and superposition, enhancing lightning protection management and scientific research of transmission line. At the end the paper emphasizes importance of lightning protection analysis, also gives expectation on lightning protection of power network with whole system and different strategy. KEY WORDS：overhead transmission line; lightning parameters; lightning trip-out; influence factors; lightning protection reconstruction 摘要：介绍广东雷电监测情况及雷电参数特点，及线路雷击跳闸、重合闸及故障点查找情况；分析雷电强度对线路雷击跳闸的影响、雷击跳闸率与地面落雷密度的相关性；研究线路走廊地形地貌、杆塔接地电阻、雷电流幅值、地线保护角、绝缘子类型等关键因素对线路防雷运行的重要作用，分析高雷击跳闸次数、高雷击跳闸率线路及线路避雷器的防雷运行情况。建议开展输电线路综合防雷改造、提高防雷设计标准、加强线路继电保护和重合闸管理、加强防雷运行管理和科研应用。最后强调加强线路防雷分析和雷击跳闸规律研究的重要性，并对开展电网整体防雷和差异化防雷进行展望。 关键词：输电线路；雷电参数；雷击跳闸；影响因素；防雷改造 0 引言 2008年1-8月广东电网110kV及以上线路雷击跳闸465次，跳闸率1.24次/百公里，跳闸次数及跳闸率均较2007年同期下降；110kV及以上线路雷击跳闸次数占线路总跳闸的比例为64.4%，其中500kV、220kV、110kV线路雷击跳闸比例分别为56.5%、51.0%、70.0%；110kV及以上线路雷击事故6次，事故率0.016次/百公里，其中500kV线路连续两年无雷击事故，110kV线路雷击事故最多、事故率最高。本文结合对2008年1-8月广东雷电参数及线路雷击跳闸关键影响因素分析，探寻线路雷击跳闸的规律特点，并提出线路防雷工作建议。 1 雷电探测及雷电参数 1.1 雷电定位系统 截至2008年8月，广东雷电定位系统共有18个雷电方向时差探测站投入运行，广东电科院负责系统