摘要
绕击是超高压、特高压输电线路雷击跳闸的主要原因,山区绕击跳闸率计算相对平原更为复杂。通过分析,在地面倾角和风速情况下对EGM电气几何模型进行了修正。根据实际算例探讨了影响山区输电线路绕击率的不同因素,重点分析了因雷电先导入射角以及地面倾角变化对绕击率的影响。
Shielding failure is the main cause of lightning flash-over of EHV transmission lines and UHV transmission lines, The calculation of SFFOR in a mountainous area is more complicate than that in the plain. Through analysis, the parameters of EGM electro-geometric model are corrected based on inclination angle of ground and the wind speed. The EGM is improved by considering the effect of the angle of lightning incidence, and it shows that the shielding failure rate is a function of the angle of lightning incidence, strokes lightning amplitude and ground angle.
出处
《科技信息》
2011年第5期I0353-I0354,共2页
Science & Technology Information
关键词
绕击率
电气几何模型
雷电倾角
地面倾角
风速
The rates of shielding failure
Electric geometrical model （EGM）
Angle of lightning incidence
Inclination angle of ground
Wind speed
