考虑温度效应的直流融冰架空输电线振动特性数值分析

Numerical Analysis of Vibration Characteristics of DC Melting Over-head Transmission Lines Considering Temperature Effect

为研究直流融冰过程中架空线的振动特性,在考虑温度效应的影响下,分析了两端线夹为存扭边界且扭转系数可变的架空线振动特性。利用静力平衡原理,以悬链线方程为基础,结合直流融冰过程中架空线产生的温度应力进行几何找形,推导出架空线平衡方程,并利用分离变量法,求解架空线运动方程。以500kV交流架空线LGJ-500/45和LGJ-400/50为研究对象,利用Matlab求解架空线的运动状态,并通过有限元软件ANSYS建立了架空线有限元模型,证明了理论分析的准确性。

In this paper,the vibration characteristics of over-head transmission lines during DC melting process are studied.Under the influence of temperature effect,the vibration characteristics of over-head transmission lines with the twisted boundary at both ends are analyzed.Based on the principle of static force balance,and the catenary equation,combined with the temperature stress generated by the over-head transmission line during DC ice melting,geometric shape finding is carried out,the equilibrium equation of over-head transmission line is derived,and the equation of motion of over-head transmission line is solved by using the separation variable method.Taking the 500kV AC over-head lines LGJ-500/45and LGJ-400/50as the research object,the motion state of the over-head transmission line is solved by matlab,and the tensile strength is established by the finite element software ANSYS,which proves the accuracy of theoretical analysis.