山区架空输电线路绕击跳闸率的计算研究

采用一种改进的绕击跳闸率计算方法对某山区110 kV易击线路段两个相邻档距范围内的输电线路进行绕击跳闸率的计算分析。此方法在充分考虑沿线路档距方向输电走廊任意点处的海拔高度和地面倾角的情况下,以悬链线方程为依据,计算出输电线路任意点处的导、地线对地实际高度及任意点处所对应的保护角,然后,以输电线路位于山脉不同位置时的绕击跳闸率计算公式为基础,利用MATLAB开发应用程序对输电线路任意档距范围内任意点处的绕击跳闸率进行计算分析,并于实际雷击数据进行比较,其仿真计算结果验证了本文采用的计算方法的正确性,为高海拔山区复杂地形条件下架空输电线路的防雷设计和改造提供参考依据。

Research on calculation of Shielding Failure trip-out rate for overhead Transmission Lines in mountainous areas

Adopting an improved calculation method computes the shielding failure trip-out rate which is a 110 kV mountain transmission lines of the range of two adjacent span easy to be struck by lightning, it is based on the catenary equation and the formula of shielding failure trip-out rate located at different positions of the mountain range, the altitude and ground inclination of transmission corridor at any point along the span direction are taked full account, the actual height among the ground wire, the conductor wire and the ground and the shielding angle of transmission lines at any point are obtained, then uses MATLAB to develop applications to calculate the shielding failure trip-out rate of transmission lines at any point within the range of any span with comparing the actual lighting data. Simulation and Calculation results verify the correctness of the calculation and analysis methods in the paper, it provides a reliable basis for lightning protection design and renovation of overhead transmission lines under the high-altitude mountainous complex terrain conditions.