塔-线耦合模型的建立及其在输电工程中的应用

The establishment of transmission tower-line coupling system model and its application

目前输电线路的设计方法中,塔架与导地线是分开考虑的,导地线荷载作为外力施加在塔架上;对于刚度较小的塔架,受载荷作用时塔架上部容易产生较大位移,塔架与导地线之间的耦合作用明显,不能忽略。为此,本文考虑塔架和导地线沿导地线方向的耦合作用,提出导地线力-位移等效元的概念,给出整个输电线路系统的理论等效模型,进行非线性数值仿真和实验比较。结果表明:等效模型理论值与数值仿真和实验结果吻合较好;并给出断线和覆冰情况下用等效模型计算的示例,对输电线路的整体设计具有指导和应用价值。

Transmission lineis viewed as an external force applied on the tower.For the tower with small rigidity,the upper part of the tower is easy to produce large displacement when the load is applied,and the coupling between the tower and the guide line is obvious and can not be neglected.This article considered the coupling effect between the tower and theguide line along the direction of thetower line,proposedthe concept of tower line force-displacement equivalent element,obtained the theoretical equivalent model of transmission line,and made some nonlinear numerical simulations and experimentalcomparisons.The results showed that the theoretical value of the simplified model is in good agreement with the numerical simulation and the experimental results.An example was given to calculate the force of the transmission line with the theoretical model in the case of broken line and icing,which can be used to provide a guidelineto the overall design of the transmission tower-line system.