输电线路脱冰跳跃动态模型研究

Dynamical modeling of ice-shedding on transmission line

通过在单元节点上添加集中质量来模拟覆冰;用有限元模拟方法,通过施加初应变来寻找其初始构型。经过与相关文献进行比较,验证了这种方法的可行性,进而分析工程实例中的输电塔-线体系的脱冰响应。为了探究各种因素对脱冰跳跃幅值的影响,对三组模型在不同影响因素下,包括覆冰厚度、脱冰位置、输电线路长度、输电线档数等进行研究,并总结了其规律特点。相关研究能够为塔-线体系设计以及线路除冰等工程问题提供参考。

As the lifeline of the state grid power network, overhead transmission line is under the threat of ice-shedding and other natural disasters. Ice-shedding of transmission line brings some accidents like flashover, armour clamp failure, line rupture even tower collapse. This paper adopts Finite Element Method to study the ice-shedding response of transmission lines. The static equilibrium state of the conductor is achieved by applying the initial strain to the cable, then concentrated mass is added on elements to model ice on lines instead of uniform load. The method is firstly validated by comparison with existing literatures, and then used to investigate some engineering projects. Various factors including ice thickness, ice-shedding position, span length and span number are considered to summarize some general relations about the jump height of ice-shedding. The obtained results are helpful to design power transmission lines in engineering practices.