相似性度量与牛顿插值融合的架空输电线弧垂测量方法

Research on sag measurement method of overhead transmission line based on fusion of similarity measure and Newton interpolation method

架空输电线路导地线弧垂是架线施工质量和线路安全运行的关键指标之一,针对目前弧垂测量方法在准确性、便捷性等方面存在的不足,提出了一种基于激光测距与光栅测角技术的输电线路弧垂测量数学模型,并在该模型的基础上,针对单根导线测量鲁棒性不足的情况,提出一种基于相似性度量与牛顿插值法相融合的多分裂导线弧垂测量数据质量评估优化算法,实现对数据集的补偿与弧垂计算。与点云提取电力线方法相比,该测量方法只需通过少量测量数据即可拟合出导线模型并计算出弧垂值。以220 kV双分裂导线为测量对象,进行试验验证,并与现有测量方法弧垂测量值作比较,试验结果表明数据优化后的弧垂误差率最大为1.47%,证明了该方法的准确性,能够满足工程现场测量精度要求,并提高了架空输电线路弧垂测量工作的安全与效率。

The sag of conductor and ground wire is one of the key indicators for the construction quality and safety operation of the overhead transmission line.Aiming at the shortcomings of current sag measurement method’s accuracy and convenience,a mathematical model is proposed based on laser ranging and grating angle measurement technology for the sag measurement of the line.On the basis of this model,a data quality evaluation optimization algorithm which the similarity measure combined with the Newton interpolation method is put forward to realize the data set compensation and sag calculation for the case of insufficient robustness of the single conductor’s sag measurement of the multi-split line.Compared with point cloud extraction power line method,only a small amount of measurement data is needed for the proposed method to fit the line model and calculate the sag value.In order to verify the proposed method and compare with current sag measurement methods,a 220 kV double-split line is used in a test,and the result shows that the maximum sag error rate of the optimized data is only 1.47%,which proves that the proposed method’s measurement accuracy can meet the requirement of engineering sites,and can improve the security and efficiency of the overhead transmission line’s sag measurement.