Analysis On The Operation Characteristics Of The Integral Dropper Of High-speed Rail Catenary And Discussion On Countermeasures

Integral suspension string is one of the key components of OCS equipment,which not only plays the role of transferring mechanical load,but also bears a certain current load.There are two main advantages of the suspension string: one is that it can increase the bearing point of the contact line to the greatest extent without too many supports;the other is that it can adjust the smoothness of the line and the elasticity of the overall contact network structure.The reliable operation of suspension string plays an important role in the safe and efficient transportation of high-speed railway.Once the suspension string breaks,the light one will lead to the change of contact wire height,which will affect the current collection and sliding of locomotive pantograph.If the broken suspension string intrudes into the dynamic envelope line,it is likely to cause serious pantograph catenary accidents.Therefore,the fatigue of suspension string is studied Operation characteristics,and through careful analysis to develop countermeasures to ensure the safety of power supply is very important.In view of the dynamic operation of the whole suspension string on the high-speed railway,the corresponding relationship between the fatigue characteristics of the whole suspension string,the temperature,the external environment of operation and the fatigue of the suspension string is studied with the aid of the fatigue theory.The acceleration formula of the whole suspension string in the whole dynamic stretching and bending process is obtained through the mechanical analysis,and the fatigue life of the suspension string and the running speed of the locomotive can be obtained The specific corresponding relationship of degree,contact wire tension and other factors.Through the mechanical model analysis,we can know that once the corresponding load increases,the recovery speed of the suspension string will be faster;and if the tension of the contact wire becomes smaller,the stress of the suspension string will become larger,which will lead to the overall shortening of the fatigue life of the suspension string.Taking the operation section of Wuhan Guangzhou high speed railway in Changsha power supply section as an example,this paper analyzes the defects of the suspension string counted on the first line of the site and sends the suspension string to the laboratory for testing and analysis,and draws the experimental conclusion.It is found that the fatigue of the suspension string is closely related to the installation location,the external environment of its operation,power supply mode,manufacturing andinstallation technology,material selection and other factors.This paper will focus on the research and analysis of the integral suspension string commonly used on Wuhan Guangzhou high speed railway.Firstly,the application of suspension string in traction power supply system is introduced,and then the fatigue characteristics of suspension string are mastered through theoretical analysis.Finally,a series of measures are formulated to deal with the fatigue operation characteristics of suspension string,such as innovation of new installation tools,use of bowknot The model carries out safety risk assessment and strengthens the use of 6C device,so as to effectively control and reduce the problems caused by fatigue operation of suspension string.