The paper presents results of analysis of disadvantages of contactless automatic voltage regulation (CAVR) system with a reactor switching device (RSD) that is used on direct current electrified railways. It also shows direction of its improvement. The authors have considered a functional scheme of the closed CAVR system of a converter unit with a thyristor-reactor switching device (TRSD) and a TRSNP-12500/10 converter transformer. They have also carried out an engineering and economical comparison of two modes of traction power supply system (TPSS) operation: without application of voltage regulation devices on traction substations with no-load voltage of 3500 V and with application of voltage regulation devices by the CAVR system at stabilization of voltage on levels of 3500, 3600 and 3700 V with various variants of switching devices. As a result, the authors have determined that the use of the CAVR system with the TRSD is economically efficient.

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The article considers the effect of reducing the time of train-to-train margin on the specific consumption of electric energy and the voltage level on the currentcollecting gear of an electric locomotive. Simulation of the operation of the DC 3.0 kV traction power supply system is carried out in the KORTES software package. The section of the Sverdlovsk railway with an operating system of contactless automatic voltage control was taken for the study. The article defines the rational time of the train-to-train margin for an unregulated and regulated system of traction power supply. The energy efficiency of the system of contactless automatic voltage control was evaluated.