220 kV双回线路无人机协同带电作业表面电场分析

Surface Electric Field Analysis of Drones Assisting Live Working in 220 kV Double-circuit Lines

无人机协同带电作业作为一种数字化、智能化的重要技术手段,能有效提高带电作业的效率和供电的可靠性,具有广阔的发展前景。然而,目前缺乏对无人机协同带电作业过程中表面电场分布特性的研究,无法保证无人机在高压输电线路附近作业的安全性。为此搭建了220 kV钢管塔双回线路和大疆运载无人机的三维模型,采用有限元软件COMSOL Multiphysics对无人机作业过程中的表面场强进行仿真计算,分析了表面场强的分布情况。研究结果表明,最大场强出现在靠近线路侧的旋翼尖端处;远离线路的旋翼尖端、下方支架及机身凸出部位的场强也高于其余部分;场强随水平距离的增大而减小,且变化幅度逐渐减小;当水平距离小于1.5 m时,各相场强差距较大,按大小排列依次为B、C、A相;当水平距离大于1.5 m时,各相场强差距较小,按大小排列依次为A、C、B相。研究结论可为后续开展无人机协同带电检修作业提供理论参考。

Drone-assisted live working,owing to its features of digitization and intellectualization,facilitates improved work efficiency and power supply reliability,has displayed a promising development potential.The surface electric field distribution characteristics of drones approaching electric lines are nevertheless rarely studied,resulting in unguaranteed safety of operation near high-voltage transmission lines.This work thereby made preliminary attempts at the three-dimensional modeling of 220 kV steel-tube tower double-circuit lines and DJI drone,and the simulative calculation of near-line drone′s surface electric field strength and distribution,via the COMSOL Multiphysics finite element software.According to the simulation,the maximum field strength located at the rotor tip of drone′s near-line-side.Field strengths at the far-line-side rotor tip,at the lower bracket,and at the protruding part of fuselage were also higher than the rest parts of the drone.The increase of drone-line horizontal distance would lead to a gradually decaying reduction in electric field strength.The field strengths of the individual phases could be high-to-low sequenced as B,C,A with larger phase-to-phase differences,and as A,C,B with smaller phase-to-phase differences,respectively,when the drone-line horizontal distance was>1.5 m and<1.5 m.The conclusions of this study may contain useful information for future practices of drone-assisted live working in high-voltage lines.