变电站跳线悬挂曲线数学模型研究

Suspension curve equation of jumper wire in substations

跳线一般由耐张线夹和软导线组成,为此对耐张线夹和软导线在不同坐标系中分别进行受力分析,建立各自的空间悬挂曲线方程,然后将软导线的悬挂曲线方程通过坐标变换,构建一个统一坐标系下的跳线悬挂曲线模型,并利用Matlab编程求解跳线的下料长度和最大弧垂.以某1 MV变电站为例,利用实际的材料参数与结构参数,进行Matlab计算得到跳线的下料长度.并将安装后的跳线实际弧垂与设计弧垂进行对比,弧垂误差小于0.5%,满足2%^-2.5%的工程施工要求.

Jumper wire consists of strain clamp and flexible wire in substations.In the respective coordinates,the force models of strain clamp and flexible wire are analyzed to set up each suspension curve equations.The suspension curve equation of jumper wire is unified by the coordinate transformation for flexible wire.Then the length and the sag of the suspension curve equations for jumper wire is calculated in Matlab code.Finally,the suspension curve equations are verified by using the practical parameters in 1 000 kV substations to meet the engineering demand completely,since the error between the practical sag and the design sag is less than 0.5%,less than 2%^-2.5% in practical engineering.