架空输电线路非同期摇摆数值模拟研究

Numerical Simulation for Asynchronous Swaying of Overhead Transmission Line

研究了输电线路非同期摇摆引起闪络的原因特性,针对导线非同期摇摆这一强迫振动问题,建立了线路非同期摇摆的非线性静力学、动力学计算模型,将无条件稳定的Newmark法与荷载增量法相结合,对水平两相分裂导线初始静平衡状态以及非同期摇摆状态下的非线性动力学响应进行数值模拟,得到了不同风荷载激励模型下的导线位移响应及张力变化规律。计算结果表明,应用该方法进行导线非同期摇摆分析以及检验防风偏措施效果是可行的。

The reason and characteristic of flashover caused by asynchronous swaying/windage yaw of transmission line are researched in depth. Asynchronous swaying of conductors is a forced vibration phenomenon, thus nonlinear static and dynamic calculation models are built; by use of the approach combining unconditional stable Newmark method with load-increment method, the initial static balance state of horizontally arranged two-phase bundled conductors and their nonlinear dynamic response under asynchronous swaying are numerically simulated and the displacement response and stress variation law of conductors are obtained under different wind load excitation models. Calculation resuks show that it is feasible to analyze asynchronous swaying of conductors and check the effect of anti-windage yaw measures.