架空输电线路分裂导线扭转刚度计算新方法

针对以往在架空输电线路分裂导线扭转刚度研究中存在计算误差较大的问题,提出了一种计算分裂导线扭转刚度的新方法.首先通过分析分裂导线扭转运动所引起的子导线长度变化,推导了子导线在扭转时的实际张力计算公式;然后针对一个档距的任意分裂导线进行力学分析,除了考虑到以往研究中所涉及的一些影响因素之外,还特别考虑了线路弧垂和线路两端高度差的影响,最终导出了分裂导线扭转刚度的一般计算公式.所推导的计算公式较清楚地描述了各种参数对扭转刚度的影响规律,并且通过确定这些参数能够直接计算得到扭转刚度数值.通过与实测值的比较表明,对于不同的分裂数、档距长度等参数的分裂导线,其扭转刚度计算结果均有较高的精度,证明了该计算公式的有效性和适应性.本研究为进一步分析和防治架空输电线路分裂导线舞动提供了新的手段.

New Calculating Algorithm for Torsional Stiffness of Bundle Overhead Transmission Lines

Aiming at the existing analytic methods being lacking in reliable accuracy,a new algorithm for calculating torsional stiffness of bundle overhead transmission lines is presented.Taking the length variation of sub-conductors as a result of torsional deformation of bundle conductors,the actual sub-conductor tension is gained.Then the effects of the sag and a difference of level between the two anchoring points are considered,and a theoretical torsional stiffness formula is deduced in a general bundle conductor span.The parameters affecting the torsional stiffness are revealed by the formula,and the torsional stiffness of bundle conductors can be directly evaluated by means of these parameters.The effectiveness and adaptability for arbitrary span lengths and number of sub-conductors are verified by comparing with the actual measuring results.