Research On Fault Monitoring And Management System Of Railway Power Transmission Line

The railway power transmission line(automatic blocking line)erected along the railway line is an important part of the electrified railway.The railway erection environment is complex and the terrain is changeable.The railway power transmission line is mostly mixed with overhead lines and cables.Due to the exposure of overhead lines and the aging of cable line equipment,faults will inevitably occur during operation.Once the fault occurs,the railway signal device will not work properly,which will affect the normal transportation of the railway.Therefore,when the fault occurs,we should grasp the fault information as soon as possible and eliminate the fault.At present,there is no mature fault monitoring and management system for railway power transmission line.Based on the original railway distribution automation system,the thesis develops a fault monitoring and management system that can visually display the status and fault conditions of railway power transmission line,which is of great significance for improving the reliability of railway operation.This thesis starts from the actual demand of the Northwest Railway Bureau.The railway power transmission line in this section consists of overhead lines and cables,with a total length of 63.017 km.According to the actual parameters and structural characteristics of the line,a 10 kV hybrid line simulation model is built in MATLAB/Simulink,and the fault conditions under different conditions are simulated.The simulation results are consistent with the theoretical analysis,which verifies the correctness of the model and provides a model basis for the subsequent study of fault location schemes.According to the characteristics of the non-uniform wave velocity of the hybrid line,this thesis deduces the fault location formula of multi-segment hybrid line based on the double-end ranging method,and calibrates the wave head position by the wavelet transform modulus maximum method to achieve fault location.The simulation tests are carried out under different fault conditions,and the influence of fault inception angle and transition resistance on the location results is analyzed.The results show that the method can detect the fault location,the error distance is maintained below 500 m,and the maximum relative error is 0.967%.Based on the fault location method studied,this thesis designs and develops a fault monitoring and management system for railway power transmission line.The system is realized by VB.NET and MATLAB mixed programming,and takes SQL Server 2008 as back-end database.The structure of the system includes hardware and software.The hardware part is responsible for real-time data acquisition and relay output control.The software part includes database design,man-machine interface design and system function realization.It is mainly responsible for line status monitoring and displaying,fault data processing,switch operation and control,information query and management,report generation and printing.The system is tested by black-box test method and tested on the spot.The test results show that the system interface is simple and intuitive,the function is rich and fluent,and it can run stably for a long time,which is in line with the monitoring and dispatching habits of railway power transmission line.At present,the system has been used in the power distribution station.