Research On The Scheme Of Fault Location Of Over-zone Power Supply

With the rapid development of high-speed railway in China,the all parallel AT traction system is the mainstream way for locomotives to obtain electrical energy.Compared with the traditional power supply mode,the all parallel AT power supply has obvious advantages,but this power supply mode is complex and the power supply line is increased.At the same time,the timely and accurate positioning of the traction network fault also poses greater challenges.Traction network fault location can achieve fast and effective positioning of faults,which helps to repair faults in time and improve the efficiency of operation and maintenance personnel.It is of crucial importance to the safety and economy of railway operations.Most of the current fault location schemes are set for normal power supply fault location and do not consider emergency over-zone power supply,or a fault location scheme that is in a long-term running mode of over-zone power supply in order to increase economic efficiency.Therefore,it is particularly important to study the scheme of fault location in the area of traction power supply when AT power supply is becoming more and more popular.In this paper,based on the electrical connection method and measurable electrical parameters of the traction power supply system,the equivalent circuit diagram is drawn,and the relevant fault types,fault section criteria and distance calculation formulas are analyzed and deduced.Through the analysis of the characteristics of the over-zone power supply circuits,the algorithm for over-zone power supply fault location and the method for distinguishing the type of fault are established.At the same time,according to the relevant parameters of the AT traction power supply network,a mathematical simulation model for the traction power supply system that meets the over-zone power supply needs to be established,and a corresponding model is established in RTDS.Simulate various faults and get corresponding conclusions.On the basis of theoretical analysis,this paper proposes a over-zone power supply fault location scheme that can meet the needs of both normal power supply and over-zone power supply.The solution involves fault location algorithm,fault starting principle,data synchronization method,data processing algorithm and the general idea of fault location in over-zone power supply.Finally,in the traction power supply model constructed by RTDS,the measuring device for over-zone power supply fault location is tested.