摘要
雷击输电线路的EGM理论,是基于垂直向下落雷假设。分析了高山地区500kV线路因地形复杂,同样基于均匀落雷假设,由于雷电先导移动方向不同,导致山区线路雷电绕击率升高、跳闸率增大,上述分析与实际情况相一致。分析并计算了因雷电流的幅值和雷电先导入射角,以及地面倾角变化对绕击率的影响。算例表明了绕击率的变化趋势,并探讨了影响山区输电线路绕击率的不同因素,可为线路设计和运行部门提供依据。
The lightning shielding failure of .500kV llne and transmission line models developed by EGM is calculated and analyzed. Because of the angle of lightning incidence, a new method for calculating the shielding failure rate is proposd. The calculated result is compared with the measured results and both results are consistent. And it shows that the shielding failure rate is a function of the angle of lightning incidence, strokes lightning amplitude and ground angle, The EGM is improved by considering the effect of the angle of lightning incidence. It can give reference for the design of transmission line and operation department.
出处
《四川电力技术》
2005年第4期26-28,51,共4页
Sichuan Electric Power Technology
关键词
雷电倾角
绕击率
电气几何模型
坡度
angle of lightning incidence
the rates of shielding failure
electrogeometric model
gradient
