双分裂覆冰导线舞动的动态张拉力变化特征

Dynamic Tension Change Characteristics of Double-bundle Iced Conductor Galloping

为研究覆冰导线舞动产生动态张拉力变化特征,基于水平档双分裂导线,推导出舞动状态下导线动态张拉力计算公式,并分析影响其变化的舞动波数、舞动幅值等参数,得出舞动导线的动态响应特性。根据悬链线理论与胡克定律推导导线舞动张拉力方程,用ANSYS模拟覆冰导线的舞动并输出其动态张拉力以验证所推方程。结果表明,舞动过程中杆塔耐张段导线动态张拉力呈现波形变化,且随舞动幅值、波数增大而增大;一阶舞动波数易使动态力发生较大范围变化,极易引发塔线体系的损伤;在多舞动波数下水平张拉力大于竖向张拉力,张力变化较为平稳;方程计算结果与数值模拟结果接近,推导方程合理。研究成果可为易舞地区导线、杆塔横担、杆塔支撑结构设计提供参考,对提高输电线路的经济性有重要意义。

The characteristics of dynamic tensile change of iced conductor galloping was chosen as the subject.Based on the transmission line of horizontal span double-bundle airfoils,the formula of dynamic tension was deduced under condition of conductor galloping.The galloping wave number and galloping amplitude were analyzed to determine dynamic response characteristic of galloping conductor.According to the catenary theory and Hooke's law,the tension equation of conductor galloping was deduced.ANSYS was used to simulate the galloping of iced conductor and get dynamic tension,which verify the above deduced formula.The results show that the dynamic tension of tension section conductor appears waveform changes and increase with the galloping amplitude and galloping wave number increase.The first-order galloping wave number makes dynamic tension changes in a wider range that is easy to cause the damage of tower-line coupling system.Under multi-galloping wave number,the horizontal tension is higher than the vertical tension,and the changes of tension is relatively stable.The result of equation is close to the numerical simulation,which indicates that the equation is reasonable.The research can provide reference for the design of conductor,pole arm and support structure of tower in the area where is easy to occur galloping,and also has an important meaning to improve the economy of transmission lines.