Research On Synchronous Measurement Technology And Real-Time Positioning System Of Fault Traveling Wave For 10kV Power Line Of Heavy Haul Railway

The 10 kV power distribution network along the railway is an important component of the railway’s "four electricity" system,and its power supply quality directly affects the operational safety and train operation arrangement of electrified railway transportation.However,the existing railway 10 kV power line fault diagnosis mode is still in the early stage of human resource zoning inspection method,which not only wastes manpower and material resources seriously,but also has extremely low inspection efficiency.To reverse this passive situation,it is necessary to use the latest theoretical foundations and technical means,and draw on the rich scientific research achievements of predecessors,to study an automated system that can quickly and reliably locate faults on railway 10 kV power lines.Considering the limitations of traditional methods,this system fully utilizes transient traveling waves to achieve fault localization.Firstly,on the basis of elaborating on the composition structure and working principle of the 10 kV power distribution network,the thesis theoretically analyzes the generation principle and transmission characteristics of transient traveling waves;By analyzing the traveling wave propagation process of a single lossy line,the wave equation of the three-phase line is derived theoretically,and the phase mode transformation model based on Clarke transform method and the traveling wave head recognition algorithm based on wavelet analysis are given.Secondly,in response to the limitations of traditional dual terminal traveling wave fault location methods,a dual terminal traveling wave fault location algorithm based on modulus wave velocity time difference is proposed;To enhance the transient traveling wave characteristics,phase mode transformation was performed on the collected double terminal voltage traveling waves,and a traveling wave time feature based on zero mode and line mode components was constructed.A hybrid line segmented fault location method suitable for multiple continuous transformations was theoretically derived;Using the electrical parameters of the 10 kV power distribution network,a simulation model of the railway 10 kV power system is built,and different conditions that may affect the line fault location are simulated and analyzed.By comparing with the traditional two terminal traveling wave fault location method,the correctness and feasibility of the algorithm are further verified.Finally,a dual terminal fault location system based on LabVIEW platform was designed and developed,and a synchronous measurement and fault location simulation experimental environment was established in the laboratory;By adjusting different experimental conditions,functional experiments were conducted for different characteristics,and relevant experimental data was summarized and organized;The experimental results show that the dual terminal traveling wave fault location system based on modulus wave velocity time difference not only has the advantages of clear principle and strong operability,but also achieves the expected design goals in synchronous measurement and fault location accuracy.