| At the economy highly developed today, railway is going to ward high speed , heavy duty.Building the High Speed Railway (HSR) or Passenger-transport special line is to meet the development of our eonomy and the demand of the state of the nation.HSR will adopt electric traction necessarily.The Power supply system is the most important part of electrified railway, so its Power supply mode also becomes one of the keyfactors that develop the HSR. AT feeding systems with the advantage of itself, got the extensive application in France, Japan, also be paid more and more attention by our railroad. At Passenger Dedicated Line is used in parallel AT power supply system, so the traction power supply system has set a higher requirements of the more reasonable of protection configuration and the more precise of the fault location.For a full-parallel AT traction power supply network fault analysis and theoretical studies, put forward a more accurate fault location method, the traction power supply system to ensure in good operation condition and the railway system's safe, reliable, efficient transport have a great significance.In this paper, to do the job for the entire full-parallel AT power supply system to create the various modules in MATLAB, and then combination the modules into a complete power system model, and do the electrical short-circuit experiments on the variety of short-circuit fault .And to draw the curve of the short-circuit current on distance with the AT transformer suck current rate.And the use of theoretical calculation, according to the current distribution in AT power supply system, re-calculate AT transformer suck current rate in all kinds of short circuit fault.and use it to compare with simulation data to calculate the error range of the simulation model. At last verified the correctness of the model.Based on the theoretical analysis and simulation analysis,make the AT transformer suck current rate form used for the fault location, and then utilized the method of modification of the fault location form to improve fault location accurately. |
