摘要
在原有的经典电气几何模型的基础上,提出了相应的改进方法。引入击距系数来描述雷击输电线路时,避雷线的击距与大地击距的不同。同时对原来计算线路绕击跳闸率的方法进行改进:采用距离差来计算绕击跳闸率。最后采用此种方法,针对典型的单回500kV酒杯塔,计算和分析了不同保护角和地面倾角时对绕击跳闸率的影响。
This paper presented improved methods base on the original electric geometry method （EGM）, strike distance coefficient was used to describe the differences between the strike distance of lightning conductor and the strike distance of ground when electric transmission line is stroked by lightning. At the same time, this paper improved the calculation method of shielding failure flashover rate, is used to calculate shielding failure flashover rate. Atlast, thispaper for thetypical 500kV glass tower calculate and analysis the influence of different protection angle and earth obliquity to shielding failure flashover rate by this way.
出处
《电力科学与工程》
2009年第5期16-19,共4页
Electric Power Science and Engineering
基金
河北省自然科学基金项目(E2005000561)
关键词
输电线路
电气几何模型
击距系数
绕击跳闸率
electric transmission line
electric geometry method （EGM）
strike distance coefficient
shielding failure flashover rate
