Browsing by Author "Drubetskaya, Tanya"
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Item Asymmetric Power Supply Circuit Design for Electric Rolling Stock on the Electrified DC Rail(IEEE, 2020) Sychenko, Viktor G.; Danylov, Oleksiy; Bekh, Petro V.; Kosariev, Yevhen; Liashuk, Vitalij; Drubetskaya, TanyaENG: Modern requirements for the traction power supply system of direct current in providing the high-speed movement are reduced to the need of ensuring a normalized voltage level of 2900 V on current collectors of electric locomotives. At the same time, the power supply system has to be stable on changes in power consumption and have the necessary specific energy intensity. The purpose of the work is to explain the transition to a new circuit design of the traction network using additional generators of electric energy. The proposed asymmetrical power supply system of the electric rolling stock allows to provide the required voltage level on the electric locomotive current collectors, to reduce the range of its changes and to reduce the power losses by 14.3% compared to the symmetrical centralized power supply circuit design with passive boosting of the traction network.Item Control System Fidelity of Electric Energy(Дніпропетровський національний університет залізничного транспорту ім. акад. В. Лазаряна, Дніпро, 2017) Chichil, A. A.; Fedorenko, A. A.; Skrypnyk, A. A.; Drubetskaya, TanyaEN: It is difficult to install consumers with faulty accounting systems, to discover areas of distribution networks with increased technological losses, and the place of theft of electric energy. To develop a methodology that allows, with existing accounting systems, to increase the informativeness of the component of the difference of distributed and consumed energy with virtually no additional expenses and, in the presence of an automated accounting system, to refuse periodic verification of the measured measuring devices and current and voltage transformers. The system for monitoring the reliability of electrical energy accounting at transformer substations has been further developed, which breaks the task at a level and solves them in stages. The developed system allows abandoning the periodic calibration of measured accounting devices and current and voltage transformers.Item Mathematical Modeling of Rocks Plasma Disintegration Process at Borehole Reaming(IOP Publishing Ltd, 2023) Potapchuk, Iryna; Zhevzhyk, Oleksandr V.; Kholiavchenko, Leonid; Pertsevyi, Vitalii; Bosyi, Dmytro O.; Drubetskaya, Tanya; Potapchuk, AnnaENG: The mathematical model of thermal disintegration of rocks during the reaming of boreholes, which takes into account the compatibility of the thermogas dynamic problem for a high-temperature heat transfer agent and the thermal problem for the rock heated by this heat transfer agent, has been developed. The mathematical model is based on the laws of conservation of mass, quantity of motion and energy and takes into account the dependences for determining the thermal stresses and the temperature of brittle fracture of rocks. As a result of solving the equations of the mathematical model, the temperature distribution in the rock mass (magnetite quartzite) during heating in the process of borehole plasma reaming and productivity of the borehole plasma reaming process are obtained. Calculated and experimentally determined productivity of the process of plasma reaming of the borehole were compared.