Research On Fault Location Method Of Traction Network Based On Fault Component Analysis

With the rapid development of China’s infrastructure projects,the number of approved Metro and high-speed rail stations in all parts of the country has increased.The increase of railway operation mileage brings opportunities and challenges to the development of transportation industry.The huge and complex railway transportation network is the power core of the whole train operation system,the stable train operation needs to maintain the safety and reliability operation of traction power supply system.If the traction power supply system fails,manpower investigation is inefficient.In order to shorten troubleshooting time,it is necessary to locate the fault quickly and accurately.China’s railway power supply system now mostly adopts AT power supply.By analyzing the fault data,the fault can be located quickly and accurately.It is of great significance to study the fault location method to ensure the safe and reliable operation of electrified railway.Due to the interference signal,the traditional single terminal fault location method will fail in detection of wave head.Based on the development of GPS technology,the problem of time synchronization is solved.The double terminal fault location method is widely used in traction network fault location.Wavelet analysis is used to identify the mutation point.According to the traveling wave mutation point,fault time is identified.The fault distance is calculated according to the fault time.The range of the fault location affected by line parameters is reduced,and the method can adapt to the fault location in different conditions.In this paper,the equivalent combination matrix of line parameter is carried out,and the electrical quantities are decoupled to reduce the influence of electrical coupling.Based on the parameters of the whole line,the wave velocity of different modulus is calculated.Then,wavelet transform is applied to fault location of traction power supply system.The fault component is analyzed by wavelet transform,and the information related to fault location is extracted.Combined with the wave velocity of traveling wave,the fault distance is calculated.This paper mainly calculates the railway traction network parameters and builds fault location simulation model on Simulink.On the simulation platform,the short-circuit fault with high probability and the operation under different fault conditions are simulated,and the fault location data with high accuracy are obtained.