Електромагнітна сумісність та безпека на залізничному транспорті
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Науково-практичний журнал "Електромагнітна сумісність та безпека на залізничному транспорті"
Scientific and practical journal "Electromagnetic Compatibility and Safety on Railway Transport"
Scientific and practical journal "Electromagnetic Compatibility and Safety on Railway Transport"
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Browsing Електромагнітна сумісність та безпека на залізничному транспорті by Author "Serdiuk, Tetiana M."
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Item Analysis of Operation of Railway Communication Systems(Дніпровський національний університет залізничного транспорту імені академіка В. Лазаряна, Дніпро, 2019) Botnarevscaia, R.; Serdiuk, Tetiana M.ENG: Actuality. Technological progress, which has rapidly burst into our lives, dictates its own rules. There is a need to modernize the railway infrastructure, which, in its current equipment, built in 70-80 years of the last century, is morally and technically obsolete. Considering the huge volumes of work to be done, we come to the understanding that it is not possible to carry out such modernization in a short time, both from a financial point of view and from a technical point of view. For a long time, you will have to measure with the simultaneous operation of both new and old equipment and ensure their uninterrupted functioning. New electronic equipment introduced in various fields requires careful testing for electromagnetic compatibility. Ensuring safety in the transport of passengers and goods depends on this. So, the scientific work deals with the analysis of operation of railway communication systems are actuality. The object of research is railway communication lines. The main purpose is to evaluate the quality of different kinds of railway communication and the reasons of noise and interference in these systems. It was carried out the follows in the paper: the reasons of appearance noises in the telecommunication channels (radio and wire communications) were analyzed; the main faults in the overhead communication lines and their influence on the quality of communication were evaluated; the electromagnetic interferences in the communication lines and their frequency diapasons were researched; the further ways of investigation and simulation of influence traction and non-traction systems on the communication channels were described. The scientific novelty is in the proposition of use CST simulation to investigate electromagnetic influence of traction and non-traction power system on the communication channels with the 8-poles mathematic modelling. Research will be carried out by the method of direct measurements on existing equipment and collection of statistical data. At the end of the research, conclusions will be drawn about the electromagnetic compatibility of the of old and new equipment of communication systems, and we can say that the issue does not lose its relevance due to the introduction of new types of rolling stock, the modernization of traction substations.Item Automated Measurement of Parameters of Track Circuits(Дніпропетровський національний університет залізничного транспорту імені академіка В. Лазаряна, Дніпропетровськ, 2015) Serdiuk, Tetiana M.EN: The method of measuring the parameters of track circuits (a time and amplitude parameters of code current, flowing in rail lines, an input impedance of the track circuit, a characteristic impedance, a propagation constant) is considered in this paper. The algorithms of definition of parameters of track circuit (ТС) are elaborated. As a result, the develop hardware-software apparatuses allows you to define by the EMF induced in the two receiving coils separately, the following quantities: the magnitude of the code current for the entire length of the track circuit, the duration of the pulses and pauses for all parcels of code, determine the type of code signal and the type of code track transmitter, coordinate, the length of the TC, serviceability of insulating junctions and electrical connectors. The results of measurements of EMF induced in each of the receiving coils apart, the spectral composition of the noise occurring in the traction network, and harmonic amplitude and impulse noise, the causes of noise in the rail network can be revealed. Algorithm for checking the status of the track circuit involves determining the state of the track circuit and it is carried out on the current curve of the locomotive signalling depending on the coordinates obtained from the measurements. Underestimated the value of ALS current compared with the calculated value indicates an undervalued ballast resistance. The test of offered measuring apparatuses were executed on the Pridneprovsky railway.Item Impact of Electromagnetic Interferences on Traction Network: Mathematical Model of Traction Network(Дніпровський національний університет залізничного транспорту імені академіка В. Лазаряна, Дніпро, 2019) Taghizade, Ansari Hossein; Serdiuk, Tetiana M.; Mysiv, IvanENG: In Ukraine, almost half of the railway lines are electrified. In railway network, there are automatic devices by w ich traffic of trains and safety on the railway are regulated. However, there are some faults in these automatic devices that can put the passengers and the railway system’s safety at risk. The main sources of these faults are the presence of the stray currents, harmonics, and the electromagnetic interferences. For investigation of these faults, having an accurate model of the railway network is vital. So the topic of research is actuality now. The main goal of this paper is to study the propagation of traction current harmonics on feeder zone (section between substations) and to define the interference on code current flowing in rail lines. Thus, it is necessary to carry out a mathematic model of the traction supply net. Also some scientific work was addressed to determine the traction current spectrum composition and the most dangerous harmonics for TC operations. This paper introduce a mathematical model of the railway network, which can be helpful in analysis of the impact of these faults on the railway network. It was considered as 8-poles for the one-track railway traction. As mentioned before, one of the main steps to investigate the electromagnetic interferences' impact on automatic devices of the railway system is the accurate model of traction network. The proposed model can be used when the electric locomotive current divides into two different current which flow in traction lines. Moreover, a system of differential equation regarding the proposed model was written and a solution to this system was introduced. All rail currents and the return current can be calculated from the above solution. Therefore, the impact of electromagnetic interferences on these current can be investigated.