Research On Ice Shedding Characteristics Of Electric Conductor Under Ice-Wind Coupling Condition

Due to temperature rise,external interference,or ice melting and deicing operations,ice shedding occurs on transmission lines after icing,resulting in wire deicing and jumping.During deicing and jumping,serious accidents such as tripping,wire breakage,damage to hardware,damage to poles and cross arms,and even tower collapse may occur.Under natural conditions,conductor deicing is often accompanied by wind loads.Under ice wind coupling,especially under rime icing conditions,there are significant differences in conductor deicing jump characteristics compared to calm and rime icing conditions.Previous studies have lacked systematic research.Therefore,conducting research on the dynamic response characteristics of transmission line deicing under ice wind coupling,and revealing the differences in the dynamic response characteristics of conductor deicing under wind load caused by frost and rime icing,has important academic value,and has important engineering application value for ensuring the safe and stable operation of overhead transmission lines and improving the design level of line ice resistance.In this paper,first of all,a program for generating the initial configuration of the conductor is established using MATLAB,and the numerical simulation of the self weight shape finding of the conductor is completed using ABAQUS finite element simulation software.The equivalent density method is used to simulate the icing and deicing of conductors.The effectiveness and reliability of the method used in this paper are verified by comparing the results of theoretical calculations with those of this method.Using the harmonic superposition method,a time history generation program for fluctuating wind speed was compiled in MATLAB software,and the corresponding aerodynamic parameters of the conductor were obtained using Fluent fluid simulation software.The numerical simulation of the wind load on the conductor was realized,laying a foundation for the dynamic response analysis of deicing under the coupled action of ice and wind.Based on the existing research,this paper reasonably considers the ice wind coupling effect during the deicing jump process,and conducts a simulation calculation of the wire deicing jump under this condition through nonlinear finite element numerical simulation.It compares and analyzes the deicing jump height and wire end stress of the crescent iced wire under different wind attack angles,different deicing rates,different deicing positions,and different wind load types,The variation rules of wire deicing jump characteristics with different influencing factors are obtained.At the same time,considering the differences in ice cover types in different regions or natural environments,this paper compares and analyzes the deicing jump characteristics of different densities of rime ice cover and rime ice cover under the same ice cover weight,and obtains the deicing jump difference rules of rime ice cover and rime ice cover under different ice cover weights,different wind load types,and different deicing rates.It provides ideas and theoretical basis for practical engineering applications.