复杂地形输电线路绕击耐雷性能计算方法的改进

绕击耐雷性能是评价输电线路雷击特性的重要指标.在电气几何模型的基础上,以悬链线方程为依据,研究了沿线路方向上任一截面的导、地线与杆塔处导、地线的高度差及该截面对应的保护角的计算方法,结合任一截面的海拔高度给出了新的绕击耐雷性能的计算方法.以两个算列显示了笔者给出的计算方法在实际工程中的应用.根据计算结果分析了单档距地形...

Improving of Calculation Method on Transmission Lines Lightning Protection Performance of Shielding Failure in Complex Terrain

Lightning protection performance of shielding failure is an important index to evaluate lightning characteristic of transmission lines.Traditional electro-geometric model is made a base and the catenary equation is adopted.The calculation method about the shielding angle in a certain section and the height difference of the conduct wire(ground wire) between in a certain section and in tower place were researched.Based on traditional electro-geometric method,and combined with a certain section altitude,a new calculation method of lightning protection performance of shielding failure was given.Two examples show the usage of calculation method given in the paper in engineering.According to calculating results,the relationship between terrains and maximum shielding failure lightning current in single span is analyzed.The research in the paper can offer reference to calculation on lightning protection engineering.