摘要
不同于以往通过计算暴露弧弧长或其在水平面的投影来计算绕击率的方法,以传统的电气几何模型为基础,提出在确定绕击区域后,考虑雷击入射角及其概率,通过计算绕击区域下包曲线在水平面上的投影来计算绕击率。通过典型杆塔的实例计算和比较,获得了绕击率与保护角、地面倾角及击距系数的关系,且绕击跳闸率的实例计算结果接近运行经验值。
A new calculation method of shielding failure rate based on the original electric geometry method（EGM） other than calculating the length of protection arc and exposure is presented in this paper.This method calculates shielding failure rate by calculating the projection length of the lower edge of the shielding failure region considering probability of lightning strike angle.The lightning shielding failure rate,influence of different protection angle,earth obliquity and strike distance coefficient to shielding failure rate are calculated and analyzed by the example of typical towers.The results are close to the value of operation experience.
出处
《水电能源科学》
北大核心
2010年第11期146-148,共3页
Water Resources and Power
关键词
电气几何模型
雷击入射角
绕击跳闸率
击距系数
electric geometric model
lightning strike angle
shielding failure rate
strike distance coefficient
