摘要
实际线路参数超出其有效计算条件的范围时,传统耐雷性能评估方法便不能反映弧垂和输电线路走廊复杂地形对线路绕击耐雷性能的影响。为此,提出了一种计算分析复杂地形下输电线路绕击防雷性能的方法,该方法基于改进电气几何模型(EGM),考虑3维空间内导、地线相对于地面的高度变化以及输电线路走廊复杂地形的影响,以单个档距线路为研究对象,通过求取导线暴露面的水平投影面积来直接计算出该线路的绕击跳闸次数。以某复杂地形下的500 kV输电线路为例,绕击跳闸次数计算结果为0.000 77次/a,与实际运行数据相符较好。结果表明该方法能更准确简便地计算出单个档距输电线路的绕击防雷性能,并能较好地反映出线路走廊地形的影响,可为输电线路差异化防雷研究提供参考。
For traditional evaluation methods of power lines＇ lightning withstand performance, if the line parameters are beyond effective scope of these methods, they cannot reflect the influence of sag and line corridor＇s terrain. Therefore, we present a novel approach for calculating shielding failure flashover times （SFFT） in complex terrain areas, which is based on the electro-geometric model （EGM）. Taking a line corrido＇s micro-topography and the relative position among ground wire, conductor wire and the ground into consideration, we obtained the SFFT of a line span through calculating the con- ductor exposed surface＇s horizontally-projected area. A 500 kV transmission line in complex terrain area is taken as an example, and its SFFT is 0.000 77 times per year, which agrees with practical data well. It is concluded that, using the proposed method, we can obtain a line span＇s lightning protection performance simply and accurately, which can reflect the influence of line corridor＇s terrain reasonably. The method could be referred by differentiation technologies and strat- egies of lightning protection.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2014年第3期662-668,共7页
High Voltage Engineering
基金
国家重点基础研究发展计划(973计划)(2009CB724504)~~
关键词
复杂地形
绕击跳闸次数
导线暴露面
单个档距
差异化防雷技术和对策
complex terrain area
shielding failure flashover times
conductor exposed surface
one span
differentiationtechnology and strategy of lightning protection
