Browsing by Author "Mishchenko, Tatyana M."
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Item Correlation Theory of Casual Processes in Electrical Power Problems for Systems of Electric Transport (preprint)(IEEE, Lviv, 2015) Kostin, Nickolai A.; Mishchenko, Tatyana M.; Shumikhina, LyudmilaENG: A new method is proposed for determining the energy indices in electric transport systems, based on the correlation theory of random processes. According to this method, the components of apparent power and power factor are expressed through correlation functions and mathematical expectations of investigated traction voltages and currents. Numerical calculations of active, reactive and apparent power as well as the ratio of reactive power for a traction substation feeder show that the method possesses high accuracy: the error is less than 2%.Item Electrodynamics of Power Losses in the Devices of Inter-Substation Zones of AC Electric Traction Systems(MDPI, Basel, Switzerland, 2022) Nikitenko, Anatolii V.; Kostin, Mykola O.; Mishchenko, Tatyana M.; Hoholyuk, OksanaENG: This article presents a new method for the estimation of active power losses based on a “field” approach, i.e., on the theory of the electromagnetic field and the theory of propagation of electromagnetic waves in a dielectric medium. Electromagnetic waves are assumed to transmit energy from the traction substation to electric rolling stock through the airspace of the inter-substation zone (i.e., not through the wires of the traction network) and meet electrically conductive surfaces on their way. The waves are partially reflected from the surfaces and partially penetrate them, thus creating thermal losses, the determination of which is the main task of this article. The analytical expressions for specific losses of active power are obtained by solving the system of Maxwell’s equations. Calculations of specific power losses in the catenary, rails, roofs, and bottoms of carriages and electric locomotives are performed. Power losses in carriages and electric locomotives are found to be at least 7%. A comparative assessment of the magnitude of total power losses of different types obtained by the “field” and “circuit” approaches is provided, which has established that “conditional” losses correspond to losses in rails, train carriages, and electric locomotives.Item Electrodynamics of Reactive Power in the Space of Inter-Substation Zones of AC Electrified Railway Line(MDPI, 2021) Kostin, Mykola O.; Nikitenko, Anatolii V.; Mishchenko, Tatyana M.; Shumikhina, LyudmilaENG: In railway traction, the definition of “electromagnetic field” is functionally connected to the concept of the reactive power consumed by the electric rolling stock, and characterized by the running and standing electromagnetic waves in the space of the inter-substation zones from the site of the AC traction system. Such a definition is established and theoretically justified by the theory of electromagnetic fields. This article uses the methodology of this theory, in particular, a method for power balance estimation in electromagnetic fields based on Maxwell’s equations, as well as methods for the analysis of running and standing electromagnetic waves based on the theory of reflection, propagation and transmission of plane harmonic waves. The research considers the regularities of standing electromagnetic waves in the space of inter-substation zones of electric traction systems, which occur due to the incomplete reflection of incident waves from the contact wire and metal parts of the roof surface and the frontal part of the body of the electric rolling stock. The flow of electricity to the roof surface and the frontal part of the body of an electric locomotive is considered. The possibility of using existing methods to reduce wave reflections and thereby to effectively compensate for reactive power in the space of inter-substation zones is discussed.Item Mathematical Modelling of Transitional Emergency Processes in Traction Power Network of Railway Transport(Національний університет "Львівська політехніка", 2011) Kostin, Nickolai A.; Mishchenko, Tatyana M.; Reutskova, Oksana M.; Mihalichenko, Pavel E.ENG: The article deals with the description of the mathematical model the system traction electric power supply without loading in the short circuit condition and the result of the reserches this accident process.Item Mathematical Modelling of Transitional Emergency Processes in Traction Power Networks of Railway Transport [preprint](Національний університет "Львівська політехніка", 2011) Kostin, Nickolai A.; Mishchenko, Tatyana M.; Mihalichenko, Pavel E.; Reutskova, Oksana M.ENG: The results of mathematical modelling of emergency modes of short circuit in railway traction power networks have been given.Item Non-Productive Losses of Electric Power in the Network Power Supply of Main Railway(X International Conference Modern Electric Traction Rationalization of energy consuming in the rail transport, 2011) Kostin, Nickolai A.; Mishchenko, Tatyana M.; Petrov, Andrey V.; Reutskova, Oksana M.ENG: In article is executed estimation Non-productive losses, as well as factors quality to electric powers in tractive network of the system direct current electric pulling.