Simulation Study Of Deicing Experiment Of Continuous Spans Overhead Transmission Lines

Under the conditions of wet and cold weather,ice accretion and deicing phenomenon will occur on the transmission line.Ice accretion will increase the load of the guide line and change the internal force distribution of the transmission tower,and thenthe electrical performance and mechanical properties of the line can be affected.The deicing will have a dynamic impact on the conductor,ground wire,insulator and the whole transmission tower.This paper takes the study of ice accretion and deicing of existing transmission lines as the background todesign and analyze the deicing experiment of continuous span overhead transmission lines.The aim of this paper is to analyze the influence of different deicing conditions on transmission lines,and to put forward constructive suggestions for artificial or mechanical deicing.Set four change parameters:Deice thickness,deicing location,deicing way and deicing rate.Firstly,the experimental simulation system for the deicing of continuous overhead transmission lines is established.A variety of experimental conditions are designed,and the dynamic tension characteristics of the conductor under different working conditions are obtained by changing the parameters of the line,and the experimental results are sorted and analyzed.Secondly,this paper has finite element analysis about ice accretion and non-synchronous deicing of continuous span overhead transmission lines.The vibration state of the conductor under different deicing mode is studied.Comparing and analyzing with the experimental results to get conclusion.The dynamic tension characteristics of the conductor under different working conditions are obtained by changing the variable parameters.Research results show that:As the thickness of the ice accretion increasing,the static tension of the wire is increasing,the range of dynamic tension amplitude increases and the jump height of deicing increases;The extreme value of the dynamic tension of a conductor obtained under a deicing condition may exceed its static tension value.With the increase of the thickness of the ice accretion,the amplitude of the dynamic tension of the conductor increases;comparing the deicing conditions of two spans,the oscillation amplitude of the conductor in a non-symmetrical span is larger under the same ice accretion thickness conditions;the variation range of dynamic tension value obtained by a deicing condition of one span is greater than that of the semi-span when other parameters are identical.When the conductor returns to steady state,its static tension value is smaller.The oscillation amplitude of the conductor under asymmetric deicing conditions is more intense than that of symmetrical deicing when other parameters are identical.For non-synchronous deicing conditions,The variation range of the dynamic tension amplitude of the conductor increases first and then decreases as the time interval increases.The longer the time interval is,the less obvious the change range of its amplitude is.For non-synchronous deicing conditions,when the time interval is increased to a millisecond level,the change amplitude of the dynamic tension after the deicing of the conductor is significantly smaller.However,the longer time interval makes the circuit oscillation process longer.