Aiming at the problems of high dependence on data and insensitivity to weather conditions in the current lidar ranging of overhead transmission lines,a simulation model of overhead transmission line sag based on UAV airborne lidar is proposed.The UAV is used to collect 3D point cloud data of overhead transmission lines.A sag curve model of overhead transmission line is proposed,which can simulate the deformation shape of transmission line under different weather conditions based on parabol-ic catenary equation.In the experimental stage,the proposed method is verified by taking a 110 kV transmission line in a prov-ince of China as an example.The experimental results show that the increase of temperature leads to the decrease of tension and the extension of transmission line length,and the horizontal tension perpendicular to the transmission line increases with the in-crease of wind pressure.At the same time,the skewness of the deformation of the transmission line simulated by the proposed model is less than 1.22％compared with the real situation.The simulation results verify the validity of the proposed model,which provides a reference for the development of overhead transmission line inspection and transmission line safety analysis.
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