Identification And Location Of Pantograph-OCS Faults

In recent years,with the continuous development of electrified railway in China,the traffic density and operating speed of rolling stock is increasing on a daily basis,exerting greater demands for the operation safety of the railway system.The interaction between pantograph and OCS directly affects the driving safety.In case of the pantograph-OCS fault during operation,the normal current collection of electric locomotives may be impacted.Even worse,the power supply may be interrupted.In such a case,it is of great significance to timely obtain fault information and quickly locate fault points upon the occurrence of pantograph-OCS fault,taking effective measures,restoring power supply in the shortest time and minimizing its impact on the railway transportation order.This thesis analyzes the current situation at home and abroad and develops a technical proposal of the study.A brief overview of the operating principle of pantograph and the structure of OCS is presented in the paper.Based on the operation features between pantograph and OCS,it elaborates the relation between pantograph-OCS features and pantograph-OCS faults.The specific causes of pantograph-OCS faults are sorted out through the analysis of multiple case studies.It develops a comparative analysis of several pantograph-OCS faults caused by hard spot and proposes a fault identification solution based on the vertical acceleration of both the pantograph head and train body,upon which the distribution characteristics of the vertical acceleration of both the pantograph head and train body are further analyzed,and the criteria for the determination of the fault causes(whether it is directly caused by hard spot or indirectly caused by the unevenness of track surface of ballast bed)is presented.The hardware circuit of fault identification system is designed,and the fault identification software is developed according to the above-mentioned criteria for the purpose of conveying direct message to the power supply department upon the occurrence of pantograph-OCS fault,providing a reliable basis for fault diagnosis.The fault location system is developed on the basis of the pantograph-OCS fault identification system.By analyzing the traditional location method with the practical application of the current detection and monitoring system for high-speed railway power supply safety(6C system),this paper proposes a solution for image location and acquisition by using catenary-checking video monitoring system(2C subsystem).A software is designed to locate the mast number,which is able to perform extraction,character segmentation and number identification of the image features of the mast number by using the HOG feature extraction,SVM classifier,OpenCV and other image processing technologies.As the functions of 6C system are constantly updated and improved in practical application,the next sustainable work of this paper is to discuss the software development of pantograph-OCS fault identification and fault-point location in question,coupled with the application of 2C subsystem,which will be argued to produce a marked effect in the field application.