Research On The Characteristics Of Electromagnetic Disturbance From The Off-line Of Pantograph And Catenary

The Neutral-Zone area is an important node for the power supply system to switch the power supply section in the electrified railway,which is a special structure that cannot be avoided.According to the existing research results and engineering experience,it can be seen that when the train passing through the Neutral-Zone area,obvious electromagnetic disturbance occurs,and the potential electromagnetic interference to the power supply system,vehicle e-powered equipment can occur.As for over-voltage and protection of over-phase train,an in-depth study has already done.Through structural analysis,theoretical analysis,modeling simulation,experimental verification and field measurement,this thesis has mainly studied the characteristics of electromagnetic disturbance of off-line of pantograph and catenary when the train passes through the Neutral-Zone area.Firstly,a detailed analysis has been done,including the structure of the train power supply system and the reasons and characteristics of off-line under different conditions,such as such as long offline time when passing the Neutral-Zone area and fixed off-line locations.Also a further analysis has been done on the conduction disturbance which caused by a series of movements of the train.By simplifying the model,the circuit simulation and the measurement of the cable on the vehicle,the data of common mode on the cable and the data of radiated disturbance of pantograph and contact line have been collected,when the train passing through the Neutral-Zone area.Secondly,the electrification process of off-line generated in the Neutral-Zone area and the ordinary area has been analyzed.The mechanism of electromagnetic radiation by off-line is analyzed by the theory of discharge and traveling wave antenna.By analyzing the nature of train off-line,it is reduced to a model and analyzed by electromagnetic simulation software.Comparing the spectral distribution of electromagnetic disturbance and the transverse attenuation of harassment signals generated by off-line under different conditions,the fitting formulas are put forward.According to the real situation,this thesis has analyzed the shortcomings of the test method of the radiated emission of the track system on the overpass,and a tentative study on the he attenuation along the longitudinal direction of the disturbance signal also has been done.Then,by analyzing the nature of the off-line is gas discharge which caused by high-voltage electric breakdown air,an off-line simulated platform has been built.The discharge test carried out to obtain the signal characteristics of time-domain and frequency-domain harassment when the off-line discharged,which was compared with the previous results.At the same time,in the Neutral-Zone area,the off-line actual test got the real disturbance signal data,and simulation data,experimental data for joint analysis.In the end,the characteristics of the electromagnetic disturbance of the off-line generated by the train passing through the Neutral-Zone area has been summarized.Finally,the result of the project are presented,including a specified analysis of the characteristics of the electromagnetic disturbance of the off-line in the Neutral-Zone area,and the shortcomings of the present research as well as the possible fields to be further exploded.