scholarly journals Effect of transient processes on the switching stability of dc machines

2018 ◽  
Vol 239 ◽  
pp. 01036 ◽  
Author(s):  
Viktor Kharlamov ◽  
Pavel Shkodun ◽  
Andrey Ognevsky
Keyword(s):  
Magnetic System ◽  
Significant Proportion ◽  
Electrical Energy ◽  
Operating Conditions ◽  
Fine Tuning ◽  
Transient Processes ◽  
Rolling Stock ◽  
Electric Motors ◽  
Electric Rolling Stock ◽  
Switching Stability

Effective use of fuel and energy resources is one of the main tasks in modern industry and transport. The main directions of increasing the energy efficiency of the electric rolling stock of railways are considered in the paper. For the electric rolling stock of railways, a significant proportion of electric power consumption falls on traction needs. The consumption of electrical energy and its recovery directly depends on the proper operation and fine-tuning of the magnetic system and switching of traction electric motors of the rolling stock. The methods of testing traction electric motors currently used in railway transport do not fully correspond to their operating modes during operation. For more reliable control of their condition, a methodology for estimating the nature of the operation of traction electric motors in conditions close to real ones was proposed. Studies of the influence of transient processes on the quality of switching of traction electric motors taking into account operating conditions are carried out. Based on the results of the study, the analysis of the data obtained is carried out, and a criterion for estimating the switching stability of traction electric motors in transient operation modes is proposed. The proposed criterion allows carrying out quality control of the tuning of the magnetic system and switching of the traction electric motor, and also estimating the nature of its operation in various modes, taking into account the operating conditions.

scholarly journals Improving the theory for calculating the rational modes of traction electrical equipment

2019 ◽  
Vol 124 ◽  
pp. 05077 ◽  
Author(s):  
A.E. Auhadeev ◽  
R.G. Idiyatullin ◽  
P.P. Pavlov ◽  
V.M. Butakov ◽  
L.N. Kisneeva ◽  
...  
Keyword(s):  
Electrical Energy ◽  
Electrical Equipment ◽  
Operating Conditions ◽  
Rolling Stock ◽  
Electric Transport ◽  
Operating Modes ◽  
Scientific Hypothesis ◽  
Electric Rolling Stock ◽  
Traction Equipment ◽  
Electric Traction

Research shows that the existing theory and methods for calculating rational operating modes of traction electrical equipment do not provide a sufficient level of adequacy under real operating conditions of urban electric transport, which is due to the high complexity of the processes and the lack of a sufficiently developed methodology for their interpretation in industry theory. The purpose of the study was researching the process of electric traction as a result of transformation electrical energy in purposeful mechanical movement of electric rolling stock with the implementation of all technological conditions of production and technical system of urban electric transport. The scientific hypothesis that the modes of operation of electric traction equipment as part of an automated electric drive of the rolling stock of urban electric transport are formed under the influence of a complexly organized technological process of electric traction and are the topological basis of its structure is theoretically substantiated. The main result of the research is the formulated theoretical system which allows us to present the process of electric traction as a system consisting of five levels that are in hierarchical relations and solve each specific problem of building the movement of electric transport. Such an approach will contribute to the development of theory and methods for calculating rational operating modes of traction electrical equipment of urban electric transport, the improvement of the energy efficiency of which is the actual scientific problem.

scholarly journals Development of the system of visual control of electric power consumption by electric rolling stock

2018 ◽  
Vol 239 ◽  
pp. 01035 ◽  
Author(s):  
Stanislav Istomin ◽  
Artem Perestenko ◽  
Cong Dang
Keyword(s):  
Power Consumption ◽  
Electric Power ◽  
Electrical Energy ◽  
Visual Control ◽  
Electric Power Consumption ◽  
Rolling Stock ◽  
Power Losses ◽  
Correct Analysis ◽  
Electric Rolling Stock ◽  
Train Driver

The paper considers the issue of organization of control of electric power consumption by electric rolling stock by visualizing information on the monitor of the driver's console. With the correct analysis of information coming on board of the electric rolling stock, the train driver makes correction of the driving modes of the train in terms of energy efficiency. In this paper, to visualize information on the efficiency of power consumption by an electric rolling stock on the route, the authors propose using an indicator diagram using a green, white, and orange gradient. The variant of output of the final information on the efficiency of power consumption of electrical energy by an electric rolling stock both within the distances operated by the locomotive crews and within the hauls to the monitor of the driver's console is presented. One of the main advantages of using the technology of visual control of electric power consumption by electric rolling stock is the promptness of correction of decision-making on the rational use of energy resources, the identification of objective reasons for the overspending of energy, and the identification of reference results for the driving of trains. The prospect of development of the research topic is the approbation and implementation of the proposed technical and technological solutions in the production, which will reduce the specific consumption and unproductive electric power losses within the boundaries of the railway accounting zones.

scholarly journals Methods for predicting the wear of contact inserts of electric rolling stock pantographs

2021 ◽  
Vol 258 ◽  
pp. 02032
Author(s):  
Victor Philippov ◽  
Oleg Sidorov ◽  
Elena Sidorova ◽  
Svetlana Podgornaya
Keyword(s):  
Service Life ◽  
Power Transmission ◽  
Experimental Studies ◽  
Operating Conditions ◽  
Rolling Stock ◽  
Labor Costs ◽  
Contact Materials ◽  
High Speeds ◽  
Number Of Factors ◽  
Electric Rolling Stock

The use of current-collecting contact elements with an extended service life is one of the most economical and least costly ways to ensure reliable, economical and environmentally friendly power transmission to the rolling stock. To assess and predict the service life, Omsk State Transport University developed and successfully tested a methodology for conducting experimental studies of contact inserts for pantographs, including bench tests of each pair of contact materials. The obtained test results are the initial data for predicting the wear of elements of contact pairs and assessing their service life in real operating conditions. Prediction of wear and service life of contact elements is carried out using mathematical modeling of wear processes, taking into account the maximum possible number of factors that negatively affect the elements. The purpose of this article is to improve the method for predicting wear, taking into account high speeds. The use of a mathematical model in forecasting makes it possible to reduce time and labor costs by 2.5 - 3 times for conducting experimental studies and assessing the resource of an element of a contact pair.

scholarly journals OPTIMIZATION OF TECHNICAL READING LEVEL ON THE BASIS OF COSTS ON SERVICE SERVICES

2020 ◽  
Vol 1 (46) ◽  
pp. 313-323
Author(s):  
Sichko O ◽  
◽  
Subochev O ◽  
Pogorelov M ◽  
Kurnikov N ◽  
...  
Keyword(s):  
Significant Proportion ◽  
Weighted Average ◽  
Reading Level ◽  
Operating Conditions ◽  
Rolling Stock ◽  
Repair System ◽  
Optimum Level ◽  
Motor Transport ◽  
Average Complexity ◽  
Technical Readiness

Exploring the experience of the formation and development of industrial structures of motor transport, which provide the appropriate activities, we can conclude that the combination of the latter is not the only acceptable. A significant proportion of production structures of motor transport deals with only one type of activity, transferring others to the execution of outside entities. At the same time, a number of organizations combine these activities in certain combinations on the basis of basic or auxiliary. The purpose of the research is to increase the efficiency of service enterprises by ensuring technical readiness of vehicles on the basis of development of the maintenance and repair system. Using weighting factors, calculate the weighted average complexity indicators, which characterize, respectively, the qualifications; attitude towards the work performed; the discipline of labor and the technology of each operation. The optimum coefficient of technical readiness for the rolling stock of the considered service enterprise under the existing operating conditions is established. Increasing the technical readiness of rolling stock above the optimum level leads to increased maintenance costs and repair of rolling stock and reduce the efficiency of its operation. KEYWORDS: ROLLING STOCK, TECHNICAL READINESS, FACTORS, COMPLEX ACCOUNTING

scholarly journals Analysis of energy efficiency of suburban railway transport network

2021 ◽  
Author(s):  
Aleksander Jakubowski ◽  
Krzysztof Karwowski ◽  
Andrzej Wilk
Keyword(s):  
Energy Efficiency ◽  
Power Supply ◽  
Mechanical Energy ◽  
Electrical Energy ◽  
Daily Basis ◽  
Operating Conditions ◽  
Transport Network ◽  
Rolling Stock ◽  
Rail Network ◽  
Traction Power Supply

Rising numbers of agglomeration residents cause increased need for people movement on daily basis. Because of congestion of local roads, air pollution and limited parking space, providing mass transit based on electric traction is reasonable. While the electric rail vehicles are considered highly efficient in themselves, they need to be analyzed as a part of a transport network, because energy consumption depends on operating conditions as well. Information about energy efficiency of whole system operating under realistic conditions could be helpful for modernization of traction power supply, timetable planning or while ordering new rolling stock. This paper presents approach to analysis of energy efficiency of a suburban rail network, using specialized software developed on Matlab/Simulink basis. For the sake of analysis, simple transport network consisting of three lines was considered. Vehicles, assumed as uniform electric multiple units, operate according to the set schedule, taking into account varying electric drive efficiency and mass dependent on passengers’ number. Vehicles are supplied by four substations with nominal voltage of 3000 V DC, using overhead contact line. Developed model includes calculation of energy losses in power supply, therefore it is possible to determine efficiency of the whole network as a relation of mechanical energy of vehicles movement to electrical energy fed from public power system. Mean useful voltages for vehicles and substations are computed as well. Program structure allows for further expansion, e.g. with optimization algorithms.

scholarly journals Review of structural battery designs used on mine electric locomotives

2020 ◽  
pp. 109-118
Author(s):  
Viktor Gutarevich ◽  
Keyword(s):  
Operating Conditions ◽  
Rolling Stock ◽  
Alkaline Batteries ◽  
Advantages And Disadvantages ◽  
Electrochemical Systems ◽  
Lead Acid Batteries ◽  
Systems Research ◽  
Electric Rolling Stock ◽  
Structural Battery ◽  
Lead Acid

Introduction. The use of alkaline and lead-acid batteries in electric locomotives of mining enterprises is currently relevant. There is a need to study the requirements for mine electric locomotives and identify the advantages and disadvantages of electrochemical systems. Research aim is to conduct a comparative analysis of the applied electrochemical systems of mine locomotives, consider the advantages and disadvantages of batteries used in mine electric locomotives, and consider the processes that occur when charging and discharging batteries. Methodology. A review of existing electrochemical systems used on electric rolling stock in the conditions of mine workings is carried out. The processes of charge-discharge of alkaline and lead-acid batteries are considered. Results. This article analyzes the electrochemical systems used in mine electric locomotives, of which two can be distinguished. Lead-acid batteries have a number of significant drawbacks that limit their operating conditions. Alkaline batteries are more widely used as an energy source for mine electric locomotives. Findings. The main types of electrochemical systems used in mine locomotives are highlighted. Their main advantages and disadvantages are examined, from which it follows that the data on the type of batteries operate using caustic substances, which requires additional measures to ensure safe operation.

Influence of smooth and step-by-step regulation of excitation attenuation of traction electric motors of electric locomotives on the speed of movement of electric rolling stock

2021 ◽  
pp. 99-105
Author(s):  
T. V. Volchek ◽  
Keyword(s):  
Graphical Method ◽  
Rolling Stock ◽  
Electric Motors ◽  
Electric Locomotive ◽  
Excitation Current ◽  
Railway Network ◽  
Control Zone ◽  
Software Complex ◽  
Electric Rolling Stock ◽  
Train Speed

ter reaching the maximum voltage at the 4th control zone of the rectifier-inverter converter of an AC electric locomotive, a further increase in speed is achieved by connecting the field attenuation system (FA) of traction electric motors (TEM). All domestic electric locomotives use the FA TEM system of the inductively active type with step switching. However, it has drawbacks, one of them is that step switching causes speed losses and slows down the acceleration of electric rolling stock (ERS). By 2025, the goal is to increase the speed of freight trains, which will increase freight turnover on the railway network [1]. One solution is to improve the ERS. In this regard, it is proposed to improve the standard FA TEM system of an electric locomotive by using IGBT transistors, which allow smooth regulation of the excitation current. In the article, using the graphical method of the RM, a curve of the train speed is constructed, which proves that the smooth control of the electric locomotive FA TEM allows you to quickly reach the maximum permissible speed of the electric locomotive on the section and to move at a higher speed in the ascent than with step-by-step regulation. The simulation of the 3ES5K series electric locomotive in the «Cortes» software complex on the Winter - Irkutsk-Sortirovochny section was also carried out, which proved that with the smooth regulation of the FA TEM, the technical speed of the ERS increases by at least 2,5 km/h.

Simulation of an ac electric locomotive operation in the regenerative braking mode

2021 ◽  
pp. 106-114
Author(s):  
V. S. Tomilov ◽  
Keyword(s):  
Mathematical Modeling ◽  
Energy Savings ◽  
Rolling Stock ◽  
Regenerative Braking ◽  
Contact Network ◽  
Electric Motors ◽  
Electric Locomotive ◽  
Power Circuit ◽  
Electric Rolling Stock ◽  
Train Speed

Regenerative braking is one of the most important energy-saving resources on electric rolling stock (EPS) of railways and feasibility of its use is confirmed by a rich half-century history. The development of the recovery mode begins with the release of the experimental AC electric locomotive of the VL61 series № 012 and continues with the release of the modern series of electric locomotives 2 (3, 4) ES5K and EP1v/i. The use of recuperation allows you to achieve significant energy savings, to ensure the safety of driving heavy trains on the track profile with long descents. In the regenerative braking mode, the EPS has rigid braking characteristics, ensuring maintenance of constant train speed, increasing the technical speed of the train and capacity of the railway section. This article presents the results of mathematical modeling of operation of an AC electric locomotive in the regenerative braking mode using a standard rectifier-inverter converter (RIC) and presence of ballast resistor blocks (BRB) in the power circuit, and using a promising RIC based on IGBT transistors, for which a method for implementing regenerative braking on AC electric locomotives without the use of BRB in the anchor circuit of traction electric motors is developed, with the help of which it is possible to increase the amount of electricity given to the contact network, as well as to expand the area of braking characteristics of the electric locomotive.

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