高压输电线路塔线体系动力学分析

Dynamic analysis of high voltage transmission line tower line system

为分析输电线路塔线耦合体系动力学特性,应用ANSYS建立ZM1猫头塔“耐直直耐”三维有限元模型。采用迭代法进行导地线找形,研究预应力下塔线体系模态和振型。结果表明:有限元模拟的导地线弧垂与理论计算基本一致,能够准确进行线路找形;塔线体系在低阶表现为导地线先行正弦振动,同振型频率集中,高阶表现为杆塔振动,伴随导地线振动,振型组合呈现多样性。研究结果对进一步研究塔线体系下风荷载、地震等动态特性具有指导意义。

In order to analyze the dynamic characteristics of transmission line tower line coupling system,using ANSYS establish the three-dimensional finite element model of ZM1 cat-head tower.The iterative method is used to find the shape of the conductor and ground wire,the modal and vibration mode of the prestressed tower line system are studied.The results show that the sag of the conductor and ground wire simulated by the finite element method is basically consistent with the theoretical calculation,which can accurately find the shape of the line.In the low order,the tower line system behaves as the first sinusoidal vibration of the conductor and ground wire,and the frequency of the same vibration mode is concentrated.In high order,it behaves as the tower vibration,with the vibration of the ground wire,the combination of vibration modes presents diversity.The results are instructive to further study the wind load and seismic characteristics of tower line system.