输电线路防雷性能评估中的复杂地形地区模型  

Complex Terrain Area Model for Lightning Performance Evaluation of Transmission Lines

作　　者：耿屹楠[1] 曾嵘[1] 李雨[1] 余占清[1] 何金良[1] 李志钊[1] 

机构地区：[1]清华大学电机系电力系统及发电设备控制和仿真国家重点实验室,北京100084

出　　处：《高电压技术》2010年第6期1501-1505,共5页High Voltage Engineering

基　　金：国家自然科学基金(50737001);国家重点基础研究发展计划(973计划)(2009CB724504)~~

摘　　要：山区地形复杂,土壤电阻率高,输电线路防雷形势尤为严峻。传统的评估方法没有深入考察局部地形的影响,仅仅区分山区与平原,往往导致评估与运行结果出入较大,为此,提出输电线路防雷性能评估应该充分考虑局部地形对防雷性能的影响。基于大量现场调研的结果,结合输电线路的高程图及导线与地面之间的相对位置,对山区架设的输电线路的局部地形进行分析,总结出8种山区局部地形,通过分析地形对雷击过程的影响,归纳出3种雷击跳闸严重的基本地形,其他的局部地形可以根据这3种基本地形得到。提出采用加权法计算山区输电线路的雷击跳闸率,评估其防雷性能。采取基本地形与局部地形的两次加权的方法计算绕击跳闸率。计算结果证明了该方法在计算地形复杂地区输电线路的防雷性能方面的科学性与有效性。The traditional evaluation methods for lightning outage performance of transmission line just consider two types of local terrain,the mountainous and plain,which is usually not reasonable compared with operation data.A new approach for evaluating the lightning outage performance of transmission lines in complex terrain areas was presented.Based on the investigation data in different areas,and according to the analysis of these local terrains of transmission lines in detail,eight different types of mountainous terrain were summarized.After analyzing the effect of terrain to the lightning shielding failure of transmission line,three basic terrains were suggested for the evaluation,and the shielding failure characteristics under these three basic terrain conditions were analyzed.Compared the calculated results with the operation data,this proposed method has a better agreement.

关 键 词：雷击跳闸率 绕击 局部地形 上行先导 地面倾角 跨谷深度 加权平均 

分 类 号：TM862[电气工程—高电压与绝缘技术]