一种基于力学分析的覆冰厚度计算方法

A method for calculating ice thickness based on mechanical analysis

为了减小线路覆冰厚度的计算误差,提出了一种基于力学分析的覆冰厚度计算方法,该方法考虑到垂直比载变化特性的情况,利用绝缘子串的拉力、倾斜角等监测数据作为输入量,根据架空线路状态方程和杆塔力学平衡方程求解覆冰状态下的导线比载;为减小因监端数据稳定性带来的计算偏差,进一步利用无覆冰时的历史监测数据对比载进行修正,进而计算导线覆冰厚度。最后,以某一线路实际的监测数据进行验证,结果表明:与传统上采用几何分解的方法对比,本文所提出的覆冰厚度计算方法,其计算误差较小,满足工程需求。

In order to reduce the calculation error of icing thickness of transmission line,a calculation method of icing thickness based on mechanical analysis is proposed.Considering the variation of vertical specific load,the method uses the monitoring data of tension and inclination angle of insulator string as input,and calculates the icing thickness according to the state equation of overhead transmission line and the balance equation of tower mechanics.In order to reduce the calculation deviation caused by the stability of monitoring data,the historical monitoring data without icing are used to modify the specific load of the conductor,and then the ice thickness of the conductor is calculated.Finally,the actual monitoring data of a certain line are used to verify the results.Compared with the traditional method of geometric decomposition,the calculation error of ice thickness proposed in this paper is small,which meets the engineering requirements.