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The experience of the railways electrification in Russia and the justification of the current type choice for the electrification of the Ulan-Bator Railway are considered. The calculation of the maximum mass of the wagons of freight trains of an AC electric locomotive of 2ES5K and an electric locomotive of direct current 2ES6 in the conditions of the Ulan Bator Railway is performed. The rationale for choosing the kind of current for the electrification of the Ulan Bator railway is presented.

Railway transport faces the challenges not only to ensure uninterrupted transportation of national economic goods, but also to develop new locomotives and increase the efficiency of their use. In particular, the currently accepted mode of starting diesel locomotives of the UzTE16M type leads to additional consumption of fuel resources, therefore, research on the development and improvement of the conditions for starting diesel locomotives of this type is relevant. Based on the study of previous studies and designs of various systems in order to facilitate the start of diesel locomotives with electric transmission, it is necessary to establish the available reserves of the power circuit and control circuits. The article considers a mathematical model of torsional oscillations in a diesel generator start-up system with two concentrated mass moments of inertia. Torsional oscillations between the traction generator and the crankshaft of diesel locomotives of the UzTE16M type have not been previously considered. In this article, the problem of torsional oscillations of the reduced masses of the armature of the traction generator and diesel engine in the mode of starting the DG from the battery and additional devices is solved. The Lagrange method has derived a system of mass oscillation equations based on generalized coordinates of elastic oscillations between the masses of the armature of a traction generator and a diesel engine with a variable mass moment of inertia. For the resulting system of equations, the solution is performed by the method of operational calculus, taking into account the accepted functions of mass moments of inertia, moments of driving forces and resistances. Conclusions are drawn that the operation of the diesel starting system on diesel locomotives of the UzTE16M type is determined by the functions of the reduced mass moment of inertia of the diesel, the driving torque and the angular velocity function; the resulting solution makes it possible to calculate the driving torque and the range of angular velocity changes when starting the diesel generator set of UzTE16M locomotives for further comparison with experimental data; when using the recommended electric scheme for starting a diesel locomotive, an increase in the driving torque of the diesel crankshaft and the angular acceleration speed of the traction generator armature is achieved. Based on the developed model, it is recommended to determine the angular velocity of the diesel crankshaft.

Electricity consumption for traction depends on a number of operational parameters, including the use of power of electric rolling stock. Due to the fact that the Russian Railways are characterized by pronounced uneven sections of track, which, along with the hilly-mountain and mountain profile and has flat stretches long-haul locomotives when operating on different difficulty sections of the road have a different load and therefore operated with a different energy indicators. The purpose of this study was to evaluate the energy performance of the electric locomotives for driving passenger trains on flat terrain and the possible ways to increase their energy efficiency. To achieve this goal was the analysis of passenger electric locomotives EP2K on a flat site Novosibirsk-Omsk, West-Siberian railway, the mean values of the speeds and masses of passenger trains have been calculated for capacity, utilization factor, power rating and efficiency of electric locomotives. On the basis of the conducted research it was determined that the EP2K electric locomotives in the plains of the Railways a large extent operate in inefficient modes, due to their excess capacity, which is impossible to implement. In this regard, it was concluded that reserves of energy saving in those areas of Railways, where the operating conditions there is a clear underutilization of the capacity of the locomotives, a method of increasing the efficiency of their use through the use of a stepped power control and comparative evaluation of EP2K electric locomotives on all parts and traction motors.

Rational way to improve the operational efficiency of the locomotive is adjustable power.The implementation of this method possible with the use of automatic power regulation implementing the optimal load,the operation mode of the traction and energy unit (TEU) of the locomotive. The aim of this work is to obtain mathematical relationships,establishing the optimal ratio between the number of employees of TD given thrust and speed. Determination of the optimal ratio being in the traction motors is based on finding the minimum power losses at the nodes of the TEU. Search the minimum of complex functions is an optimization problem,which from a mathematical point of view is to determine the minimum of function of several variables with a number of constraints,and relationships. To solve the problem of finding the minimum of a complex function,we used the method of indeterminate Lagrange multipliers. The optimization process is considered at a constant value of the voltage supplied to the TD and sold power.Variables - the force of traction,speed of movement,the ratio of incremental losses,the resistance of the circuit of the armature of TD was assumed constant,which allowed to simplify the solution of the problem,reducing it to find three unknown quantities - current,the number of TD and magnetic flux. The solution to this system of equations for the number TD,participating in the work were obtained analytical dependences the optimum values of the TD depending on the speed,the thrust force on the rim of the driving wheels of the locomotive and tension. Analytical expressions for determining optimal parameters of power regulation of electric DC,allow to obtain the optimal values of the number of workers so and the load depending on the given values of thrust and speed in the entire range of load modes of EPS. The analytical expressions can be used when drawing up regime maps and energy performance certificates EPS,and also in the most important automatic devices of power control of the rolling stock to set the optimal ratio of number of employees and so on.

Electricity consumption for traction depends on a number of operational parameters, including the use of power of electric rolling stock. On Russian Railways there are flat areas of great extent, which operated the locomotives inefficient use of power and work modes with low energy performance. The aim of this work is to examine ways to improve the energy efficiency of passenger locomotives, such as the operation of electric rolling stock with rational values of power and number of axes for the modern passenger transport on the flat sections of the road long-haul and assess their energy performance. To achieve this goal was determined by the rational value of the power required for driving trains on this stretch of track with maximum speeds of 160 km/h, the calculations of the asynchronous traction motors obtained traction and power characteristics of electric locomotives with asynchronous traction drive, and a proposed comparison methodology, allowing to evaluate the difference of power consumption for traction of electric locomotives with asynchronous traction drive (with rational values of power and number of axes) currently operating a DC electric locomotive EP2K. On the basis of the conducted research it was concluded that there are reserves for improvement of energy efficiency of passenger locomotives on the flat sections of the road long-haul, such as operation of electric rolling stock with rational values of power and number of axes corresponding to the train weight, speed and track profile, which will significantly reduce the cost of electricity for traction of trains.

The analysis of the influence of the organization of the formation of United freight trains on the throughput capacity of railway sections has been carried out. The results of electrical calculations of the 3.0 kV dc power supply system of 3 sections of the Sverdlovsk and South Ural railways are presented when controlling the speed of trains from 50 km / h to 100 km / h with various locomotives while passing two single and one connected cargo trains using the system of contactless automatic voltage regulation in the contact network, allowing to assess the throughput capacity of the three sections. In the course of the calculations, the developed refinement method was applied using the correction current factors KIxx and KIst. Proved the need for their use in electrical calculations.

The contact line is a special kind of power overhead line with multiple electrical connections of wires, which form a complex topology of the linear electrical circuit. Analytical models simplify the real topology of the contact line and it limits their functional application. It is possible to take into account the topology of contact line when using tools of computer simulation, but it entails complicating the computational algorithms of the model. The aim of this article is to determine the conditions for the application of current distribution models and the development prospects in this area. The article describes the existing models for calculating the current distribution in DC contact line: a model of natural current distribution, linear analytical models, model with an infinite number of droppers, a model with a direct application of Kirchhoff's circuit laws in matrix form, and a finite element model. The article contains the main provisions and calculation capabilities of each model. Contact line KS-250-3 acts as a calculation catenary for the comparison of current distribution models. You can use the results of the article to select the optimal design distribution model for the design of the contact line, thermal analysis, current-carrying capacity calculation, identification and elimination of «weak point».

The article discusses the assessment of the impact of train schedule on the amount of electricity consumption for traction on sections of DC I-th profile type way. The proposed parameters of the train schedule, influencing the electricity consumption for traction on sections of DC I-th profile type way. The major scheduling options included statistical quantities and parameters characterizing the conditions of the batch passing trains, stop and solid thread schedules for truck-driving. Based on simulation modeling provided the main based on changes in the volume of electric energy for traction on the plot of the traction electric supply system when changing the parameters of the timetable. The dependences of the volume change of electrical energy for traction allow you to evaluate and determine the ranges of the parameters of the graph in which the variation of volume is minimal. in the considered ranges of the parameters of the train schedule, the amount of electricity for the areas of DC with the I-th profile type varies within 1 % with the constancy of other factors..

The article is devoted to the issue of power loss measurement in DC traction networks. The purpose of the work is to define the indicators characterizing the degree of determining the energy loss values accuracy when using the method of restoration of the train situation. In the article the analysis of methodical error the value arising at measurement of power losses in a traction DC network is conducted. The occurrence of the error is caused by the indirect measurement method, which is based on the principle of synthesis of instantaneous circuits in real time. The synthesis is based on direct measurements of currents and voltages on the busbars of adjacent feeding and switching points, for example, a traction substation and a sectionalizing station. The data obtained are processed in accordance with the algorithms adopted in the article, as a result of which the coordinates of loads and their current consumption are calculated. In the process of synthesizing instantaneous circuits, it is possible that such a train situation may occur, which will lead to the emergence of a methodical measurement error, due to the peculiarities of the logical and mathematical apparatus of the train situation recovery method. In this paper, has been performed a probabilistic analysis of the possibility of occurrence of methodological error when several traction loads will be present simultaneously on the measuring section, that is, the dependence of the occurrence of the measure of uncertainty on the daily size of train traffic and the dependence of the occurrence of the measure of uncertainty on the minimum inter-train interval. As a result of the study, the proposed method application the limits were established by energy loss measurement the permissible error the criterion. The methodological error the value of the measurement at different variants method of movement on the railroad studied section was assessed