Study On The Identification Of The Current-carrying State In The Pantograph-catenary System

Pantograph and catenary system is an important part of traction power supply system in electrified railway.In the process of high speed operation,the electric power train will often occur offline.The offline of pantograph-catenary system can bring the flow state problem.The interference of the current-carrying threatens the reliability of the power supply system and influences the correct transmission of control signal and communication signal of the railway.Research on the problem of electromagnetic interference caused by the current-carrying state of pantograph-catenary system is a frontier subject in the system of pantograph-catenary system.In this paper,experimental system of the current-carrying state of pantograph-catenary is used.The data acquisition and storage system is composed of NI data acquisition card and the upper computer software Labview,which can get contact voltage,contact current,contact temperature,contact pressure,etc.Experimental analyses under different conditions are obtained.Through the acquisition of voltage and current signal,two methods are put forward:one is in time domain analysis method,the other is in time and frequency domain.The feature vectors are selected by G-score,and then the optimal subset of feature vector is obtained.Finally,the support vector machine is recognized by the support vector machine.By comparing the two methods,the first method is selected.The results show that it can effectively distinguish with the current-carrying state and clearly look for the location of fault point.It provides a new method for classification and identification of the pantograph-catenary system.