500kV输电线路风偏特性的有限元分析

Finite Element Analysis on Windage Characteristic of 500kV Power Transmission Lines

针对近年来配电网输电线路风偏闪络事故频发的问题,采用有限元软件ANSYS建立500 kV四分裂输电线–绝缘子串有限元模型,研究稳态风、阵风模型下不同档距和档数对输电线非同期摇摆和绝缘子串下端的动力风偏响应的影响。仿真结果表明不同档距、档数及风模型的选取对输电线路的动力风偏响应均有不同程度的影响,且只有综合考虑输电线非同期摇摆和绝缘子串下端的风偏响应,才能有效防止输电线路风偏闪络事故的发生,提高输电线路的安全运行。

In allusion to the problem of frequent windage flashover of power transmission lines of power distribution networks in recent years, this paper uses finite element software ANSYS to establish a finite element model for 500 kV four split pow- er transmission line-insulator chain and studies influence of different spans and gears on asynchronous swaying of power transmission lines and dynamic windage response at the bottom of insulator chain. Insulation results indicate that selection for different spans, gears and wind models have different influence on dynamic windage response of power transmission lines, and only by comprehensively considering asynchronous swaying and windage response at the bottom of insulator chain, it is able to effectively prevent windage flashover accidents and improve safe operation of power transmission lines.