输电线路绕击跳闸率的改进计算方法  

Improved Calculation Method of Transmission Line Lightning Shielding Failure Rate

作　　者：张金霞[1] 樊明[1] 张小红[2] 

机构地区：[1]青海大学水电系,青海西宁810016 [2]安徽氯碱化工集团制造部,安徽合肥230011

出　　处：《水电能源科学》2010年第11期146-148,共3页Water Resources and Power

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.

关 键 词：电气几何模型 雷击入射角 绕击跳闸率 击距系数 

分 类 号：TM863[电气工程—高电压与绝缘技术]