Research On Electrical Simulation And Fault Location Of Railway Signal Relay Circuit

Railway signal relay circuit is an important part of railway signal system,which is often used in logic function realization and external interface,and plays an important role in ensuring the safety of the system.Railway signal relay circuit is composed of various electrical components,which is prone to failure,and the fault location has important significance for its construction and equipment maintenance.This thesis studies the electrical simulation and fault location of railway signal relay circuit,designs and implements a software of relay circuit electrical simulation and fault location.Firstly,based on the circuit simulation algorithm,combined with the professional knowledge of railway signal relay circuit,the relay circuit electrical simulator is designed.Secondly,using the electrical simulator as a tool,the fault dictionary method is designed to realize the fault location.Then,the software is realized graphically based on C# programming language,Win Form and other technologies.Finally,the software fault location function is tested by taking the interface circuit of ZD6 switch machine and S700 K switch machine as an example.The electrical simulator of railway signal relay circuit adopts SPICE algorithm to realize the simulation mode of DC analysis and transient analysis.First of all,this thesis uses the Newton-Raphson method to solve the nonlinear equation and the implicit Euler method to solve the differential equation.Then the relay circuit component models are established in two simulation modes,including resistive elements,energy storage elements,relays and so on.Finally,combined with the circuit diagram data format drawn by the relay circuit aided design module,the data processing method is added to the simulator and the relay circuit electrical simulation function is implemented.The method of fault location in software is fault dictionary method.First of all,according to the characteristics and field experience of the relay circuit components,this thesis designs the fault model of the components,and sets up several voltage measuring points in the relay circuit diagram.Then the software sets the component fault,uses the electrical simulator to execute the electrical simulation in the circuit fault state,and obtains the electrical data of each measuring point to establish the fault dictionary.Finally,the software reads the fault dictionary and selects the recommended measuring point to guide the technicians to locate the fault according to the information entropy of each measuring point.The research and development of relay circuit electrical simulation and fault location software based on electrical simulation and fault location method provides a new solution for railway signal relay circuit fault location and has a certain universality.The software locates the faults of the railway signal relay circuit in a unified way,which improves the efficiency of the fault location of the relay circuit.