Mykhalichenko P. The scientific bases and designing of the measures for improving the efficiency of DC traction power supply system in the emergency modes

The dissertation is dedicated to improve the efficiency of DC traction power supply system in the emergency modes. The many measures are offered to make easier the transient electromagnetic processes in the electric elements of DC traction power supply system. Abatement of the transient electromagnetic processes allow to improve the continuity and safety of the locomotives traffic, the operational safety of the electric elements of the traction power supply system, and minimization of the repairing losses. The mathematical models of the traction power supply system are designed. The relative location of the electric rolling stock and the short circuited point, the sections scheme of the traction power supply system, the scheme type of the traction drives connection, the field attenuation degree, and the numbers of the locomotives are analyzed using the data of the mathematical models calculation. Their influence on the basic transient electromagnetic coefficients, the character of the generator currents in the emergency modes of the power supply system and electric rolling stock are investigated in this dissertation too. The mathematical models allow to estimate the influence of the pantograph detachment duration, the position of the locomotive in the feeder area on the amplitude of the current pulse in the moments of the current collector "detachment-touchdown". The simulation of the results allows to estimate the probability of the contact-wire line fusion in these emergency modes.