OBJECT. Determination of the design velocity of the gas flow in coarse and fine filters with varying degrees of contamination.
METHODS. We carried experimental studies out to solve the problem. To exclude errors during the studies caused by marriage or other reasons, 3 samples of each of the coarse and fine filters (clean and used) were used. To determine the design speed, an experimental installation was assembled, presented in the work, which included an air duct, an air injection fan, a nozzle for measuring excess pressure in front of the filter under study, an air vent hole, filter samples, a ventilation grate and measuring instruments – a differential pressure gauge testo 510i and an anemometer testo 405i.
RESULTS. The article describes the relevance of the topic, analyzes the change in the pressure drop in the duct when using spent and clean coarse and fine filters. They showed that an increase in their operational life is possible with the use of a multi-vortex separator, which can be installed as a preliminary stage of purification.
CONCLUSION. The estimated gas flow velocity when using coarse filters is only 2 m/s. The estimated gas flow velocity when using fine filters is only 0.5 m/s. A comparison of the difference in the pressure drop in the duct when using coarse and fine (spent and clean) filters shows that coarse filters are more susceptible to dusty flow, i.e. the bulk of particles in the dusty flow at an enterprise with paint chambers are relatively large particles. Hydraulic resistance increases by 1.58 times.

THE PURPOSE. Improving the energy efficiency of a hydroelectric power plant (HPP). Determination of the volume of lost thermal energy from HPP equipment. Development of options for the beneficial use of low-grade heat. Economic evaluation of the proposed options. Selection of the most appropriate waste heat utilization option.
METHODS. The methods of the theory of heat and mass transfer, thermodynamic analysis, technical and economic calculations in the energy sector are used in the work.
RESULTS. The article determined the temperatures of heat carriers in the cooling system of the hydroelectric generator of the Bratsk HPP. Calculated heat losses in the amount of 92,52 MW. 3 variants of heat supply for the facilities of the Bratsk HPP have been laid. An optimized scheme of heat generation using a heat pump installation (HPI) has been developed. A feasibility study of the proposed options for heat supply has been carried out. An analysis of the Russian HPI market was carried out. A cost-effective heat supply option with 2 Viesmann Vitocal 350-G Pro HPI was selected for implementation with a capital investment 34,46 million of RUB and a payback period of 7,3 years.
CONCLUSION. The results of technical and economic calculations show the feasibility of introducing a HPI into the heat generation system of the Bratsk HPP.

THE PURPOSE. Determination of the qualitative composition of deposits on the inner surface of the superheater tubes of the Aksuskaya GRES and CHPP stations of Aluminum Kazakhstan JSC located in the Republic of Kazakhstan.
METHODS. The most modern method of analysis is IR spectrophotometry, which is based on the absorption of IR radiation. Sediment analysis was carried out on an infrared spectrophotometer with Fourier transform of Shimadzu IRAffinity-1S. The peculiarity and justification of using this device is based on the high throughput of optics. A complementary function is a combination with a dynamic digital adjustment system. The DLATGS detector is used as a powerful ceramic radiation source. This detector is highly sensitive and thermally stabilized.
RESULTS. As a result of the analysis, it was found that the deposits on the inner surface are represented by metal corrosion products and heat-resistant humus substances. The latter easily pass into steam from boiler water (steam distillation) and settle on the surface of the tubes. Also, mineral substances and silicates are present as impurities, which also pass into steam in a small amount.
CONCLUSION. As a result of the analysis of deposits in superheater tubes at the stations of Aksuskaya GRES and CHPP of Aluminum Kazakhstan JSC located in the Republic of Kazakhstan, it was found that corrosion processes are quite intense, therefore corrosion products predominate in the deposits. To reduce the internal wear of the tubes, it is necessary to adjust the VCR, analyze the reagents used, and perform a step-by-step analysis of the coolant at each stage of cleaning.

THE PURPOSE. The purpose of the work was to systematize the results of the work of domestic and foreign authors on the thermophysical properties of media and substances involved in the process of obtaining biodiesel fuel.
METHODS. To measure the isobaric heat capacity, the predominant use is given to the methods of heat-conducting and scanning calorimeters, the measurement of the thermal conductivity by the heated filament method. Kinematic and dynamic viscosities are measured, respectively, on standard glass viscometers at atmospheric pressure and by the drop weight method.
RESULTS. The results of a study of a wide range of thermophysical properties of thermodynamic systems involved in the process of obtaining biodiesel fuel under supercritical fluid conditions are presented. Attention is paid to the density, isobaric heat capacity, thermal conductivity, dynamic and kinematic viscosity of both the feedstock and the resulting biodiesel fuel, presented in a wide range of temperature and pressure changes, including nearcritical, as well as taking into account the thermal effects caused by the dissolution and change in the structures of substances under the influence of fluid reagent.
CONCLUSION. The presented data will be necessary at the stages of designing and scaling a particular technology for the production of biodiesel fuel, both on a laboratory scale and at an industrial level.

THE PURPOSE. Analysis of the fleet and evaluation of the switching resource of 10 kV switches of the branch of PJSC «Rosseti Center»-«Orelenergo».
METHODS. In the work, based on the database of the branch of PJSC «Rosseti Center»-«Orelenergo», an analysis of the fleet of 10 kV high-voltage switches was carried out, the types of switches used, their shares in the fleet of switches were identified. The park of circuit breakers was investigated according to technical characteristics, including rated currents and currents of maximum breaking capacity in accordance with GOST R 52565-2006 and GOST 687-78, as well as the current standards of the technical organization of PJSC «Rosseti».
RESULTS. In the course of the study, it was revealed that the fleet of 10 kV switches installed in switchgear substations with a higher voltage of 35-110 kV of the branch of PJSC «Rosseti Center»-«Orelenergo» is represented by 1833 switching devices, among which: 1197 switches with low-oil arc extinguishing chambers, 636 switches with vacuum, which is, respectively, 65% and 35% of the park. At the same time, 1009 switching devices have a rated current of 630 A, and 366 switching devices – 1000 A, 1526 pieces of equipment have a rated cut-off current of 20 kA. A comparison of a low-oil switch of the VMP type and a vacuum switch BBB with a modern vacuum switch of the BB/TEL series from the point of view of the switching resource in order to justify its use to replace these switches on specific power lines.
CONCLUSIONS. Identification of the parameters of the 10 kV circuit breaker fleet makes it possible to develop rational plans for equipment replacement. Analysis of the switching resource of different types of switches allows you to choose equipment with the best characteristics.

THE PURPOSE. The lack of charging infrastructure is one of the main reasons for the refusal to use electric vehicles in Russia. The solution could be the development of mobile electric vehicle charge units (MCSEU). To implement a truly competitive product, it is necessary to take into account all possible types of electric vehicle charging, and not only standard ones, CHAdeMO, CCS, etc., but also wireless charging based on an induction charger (IC). Therefore, the purpose of this work is to model the two main types of IC implementation, compare the results obtained, and develop a physical modeling model for the selected scheme.
MATERIALS. IC is based on the principle of magnetic induction, so the simulation was carried out for two options for implementing contactless charging, the frequency and value of the inductances of the coupled coils were calculated, and based on the results obtained, conclusions were drawn about the optimal distance at which the required efficiency value is maintained. For physical modeling of the process of non-contact charging of electric vehicles, a calibrator model has been developed, and ferrite plates have been calculated.
RESULTS. Based on the simulation, a scheme for the implementation of the IC with adjustable capacitor capacitance was chosen, the topologies of antennas and the geometry of ferrite plates and a design documentation of a 6-axis calibrator for testing were developed. R&D was carried out at the Federal State Budgetary Educational Institution of Higher Education "KSPEU".
CONCLUSION. The use of IC provides great opportunities for the development of mobile charging stations, as it increases the number of possible connections. However, efficiency and charging distance are critical for this equipment, therefore, already at the modeling stage, it is necessary to select the parameters of the coils as accurately as possible, and the circuit used. For the developed MCSEU, within the framework of Resolution 218, optimal solutions were identified in the field of modeling and testing of IC.

THE GOAL. To develop a decision-making procedure for the commissioning of equipment in the power supply system of oil production facilities in accordance with the minimum risk criterion. To substantiate the effectiveness of its practical application in the tasks of equipment repair management with the "technical condition" strategy based on a risk-oriented approach.

METHODS. When solving the tasks, the following methods were used: the flowchart method for calculating the structural reliability indicators of the distribution electrical network with changes in its operational composition and technical condition of elements (equipment), the method for predicting the risks of power supply disruption in the circuit of each technological consumer, taking into account the possibility of reserving and imposing emergency recovery of the main element on the planned repair of the backup, scenario approach for determining scenarios for changing the risk of power supply failures when the operating state of the electrical network circuit changes.

RESULTS. As a result of solving the problems, the values of the structural reliability indicators of the studied distribution electrical network are calculated under the most likely scenarios of changes in its operational composition and technical condition of equipment, the features of the integrated assessment of the technical condition of objects of voltage class 6 kV in their operating conditions are considered. The functions of forecasting the probabilities of power supply failures of oil production facilities are obtained depending on the integral assessment of their technical condition, which, along with the severity of the consequences of failures, make it possible to predict risks.

CONCLUSION. A computational procedure has been developed that includes mathematical models and an algorithm for prioritizing equipment with a strategy "according to technical condition" when putting it into repair based on a forecast of the risks of power supply disruption to consumers. On a concrete example, the verification of calculation models and algorithm was carried out, the effectiveness of the developed computational procedure and its applicability in solving practical problems of managing repairs of electrical equipment of oil production facilities based on a risk-oriented approach was shown.

TARGET. The purpose of this work is to improve the method of vibration control of the active part of a power transformer by fractal analysis of its vibration signal. Fractal analysis of the magnitude-time characteristics of the quantitative assessment of the degree of "jagged" vibration signal of the transformer. For a quantitative assessment, the coefficient of fractal analysis (FAC) was introduced based on the determination of the fractal dimension by the Hausdorff-Besikovich method. To test the developed method of application, a non-contact laser measuring diagnostic complex (MDC) with developed software based on LabVIEW, ImageJ and Python. Experimental studies of the technical condition of the transformer TSZ 16 were carried out on the basis of the developed method using a non-contact LCIK, the CFA of the windings and the magnetic circuit of a single transformer was determined, the level of technical condition for the impulse elements of the transformer was determined.
METHODS. The vibration control method makes it possible to control a power transformer during its operation under voltage, which makes it possible to switch from a planned system of transformer repairs to a system for taking repairs according to the current technical condition.
RESULTS. The improved method of vibration control was tested using the developed noncontact LCIK, the level of technical condition of the power transformer under voltage was determined.
CONCLUSION. An improved method of vibration control makes it possible to determine the level of technical condition of an energized power transformer with the possibility of automatically obtaining a decision on the technical condition, as well as to use statistical methods for processing and analyzing signals received from the transformer.

THE PURPOSE. Consider the problem of using a special ferromagnetic paste, which fills the air gaps in the magnetic circuit of an oil power transformer, in order to reduce its losses, by reducing eddy currents in the magnetic circuit. Conduct experiments to determine the dynamics of change of high-voltage breakdown of transformer oil, after adding ferromagnetic paste to it.
METHODS. To solve this problem, several samples of ferromagnetic paste have been developed, differing from each other using different binding material for ferromagnetic powder. The samples were placed in containers for several days filled with transformer oil. With the help of electrical installation AIM-90, measurements of high-voltage breakdown of transformer oil of each sample were carried out. Thanks to this method, it was possible to determine how the ferromagnetic paste affects the insulating properties of the transformer oil.
RESULTS. For clarity, the results of all samples were plotted. Based on the graph, it became clear that in some samples of transformer oil a significant amount of mechanical impurities formed from ferromagnetic paste appeared, which extremely negatively affected the insulating properties of the oil. There were also samples in which the properties of the oil practically did not change.
CONCLUSION. As conclusions, there was a certain vision of which ferromagnetic paste can be used in the design of an oil power transformer, it was also possible to understand which samples of ferromagnetic pastes extremely negatively affect the insulating properties of the transformer oil.

THE PURPOSE. To examine the features of the location and the overall structure of theSredne-Kamchatskyisolated power hub. To considerthe structure of installed electric capacity and the composition of generating equipment of power plants in the mentioned power hub. To determine the composition and characteristics of the electric grid economy. To analyze and determine the main indicators of electricity consumption and capacity dynamics of the hub. To perform an analysis of the existing balance of power and electric energy, to determine the main technical and economic parameters of the power supply. To consider options for the power supply system development including on the basis of renewable energy sources.
METHODS. When solving this problem, we usedmethods of mathematical processing of statistical data and methods of normative forecasting.
RESULTS. We considered the special featuresof generating capacities and network infrastructure development,the issues ensuring the long-term and medium-term demand for electric energy and capacity, the formation of stable and favorable conditions for attracting investment in the construction of electric power facilities.The study calculated the current and prospective balances of electricity and capacity in the discussed power hubbased on the analysis of the energy structure of an isolated power unit and the dynamics of electricity consumption.
CONCLUSION. Any failure in an isolated system leads to dangerous crisis phenomena and significant economic losses. Thus it is important to provide reliable and efficient power supply to energy isolated territories. The presented comprehensive assessment of the state of the electric power industry in the isolated Sredne-Kamchatsky power plant allows us to predict the prospects for its development within the framework of the overall development of the electric power complex of the Kamchatka Territory.

THE PURPOSE. Consider the combustion process of two coals of different degrees of metamorphism and their mixtures using thermogravimetric analysis based on the change in mass and the rate of change in mass during the heating of fuels. Determine the main characteristics of fuels and the combustion process (temperature of ignition and burnout of the coke residue). Determine the tendency to slagging of coal mixtures.
METHODS. When solving the tasks, the thermogravimetric method (TGA).
RESULTS. The article provides a brief overview of the combustion of non-design fuels at thermal power plants. The results of technical and elemental analysis of Chernogorsk bituminous coal and Balakhta brown coal are presented. A technique for determining the ignition temperature and burnout of the coke residue is described. The thermograms of the combustion process of two coals of different degrees of metamorphism and their mixtures are presented. The main characteristics of their combustion have been determined. A qualitative analysis of the surface of fuel particles for the presence of pores and cracks is shown. The calculation of the tendency to slagging of coal mixtures has been carried out.
CONCLUSION. Thermogravimetric analysis showed an earlier ignition of the Balakhta brown coal in comparison with the Montenegrin bituminous coal. With an increase in the proportion of Balakhta coal in the coal mixture, the profile of the combustion curves shifts to the region of lower temperatures. The addition of 25% Balakhta coal reduces the ignition temperature of Chernogorsk coal by 16%, with an increase in the proportion of Balakhta coal in the mixture, the ignition temperature does not change. Balakhta coal has a high tendency to slagging furnace walls, in contrast to Chernogorsk coal, therefore, an increase in its mass fraction in the coal mixture increases the tendency to slagging furnace screens.

Based on the statistical analysis of publications and patents located in the RSCI database for the keywords «exoskeleton», «anthropomorphic robot», «bionic prosthesis», interest in the research topic has been established, expressed in a significant increase in publications in recent years. It was revealed that most of the models use absolutely solid links in the form of rods.
GOAL. Identification and study of problems arising in the modeling of anthropomorphic robotic systems.
METHODS. Methods of mathematical modeling, analysis, comparison with a biological prototype, robotics, theoretical mechanics, electromechanics were used.
RESULTS. The problem of accuracy of modeling by rod robotic systems with absolutely rigid links, a link of the human musculoskeletal system, is considered. The relative error of the accuracy of approximation by rods of a human limb is calculated, a conclusion is made about a significant error in the modeling of links. The problem of evaluating the influence of a rotating rotor of an electric motor on a mechanism model is considered. Next, the model is considered taking into account the rotating rotor and gearbox. It has been established that when modeling anthropomorphic mechanisms with rods, the problem arises of the need to take into account the dynamics of drives. An electromechanical model of a link with a DC motor is proposed. A significant increase in energy costs during the movement of the link has been established, in comparison with the model of an ideal hinge, in which the required control moment is created, which is a problem. A partial solution of the identified problems is proposed using the model of a variable length link containing three sections.
CONCLUSION. The study made it possible to identify problems that arise when modeling the human musculoskeletal system with rod robotic electromechanical systems with absolutely solid links.

THE PURPOSE. To consider the problems of express-control and asphalten-resins and paraffins (ARP) purification of oil from them. Elaborate new methods of oil-well liquid and oil express-contro, especially of ARP. The task is actual, because great amount of ARP lead to ARP – deposits in pipeline, which result to complications in oil-mining, increase of power consumption and wearing of machinery. Elaborate the technology and installation for removing ARP from oil under affect of physical fields.
METHODS. When solving this problem, we used the backward/forward method of nuclear (proton) magnetic resonance (PMR) relaxometr, which is noncontact, nondestructive, does not need probe preparense. For ARP removing were used: rotating magnetic, nonuniform alternating electric, centrifugal fields and gravitation separation of emulsion. Was used also physica modeling and MatLab Simulink mathematical modeling.
RESULTS. Elaborated the methodics of express-control of ARP and water concentrations, disperse distributions of water solutions of ARP with reagents in emulsions. Were received experimental equations between ARP and water concentrations and times of PMR spin-spin relaxations, which gives the opportunity determine the oil characteristics from NMR-parameters. Theoreticall grounded the technology of the ARP removing from oil, described the forces, affecting on droplets in the rotating magnetic, nonuniform alternating electric, centrifugal fields. Elaborated the structure-functional scheme of installation for purification of oil from ARP, controlled by elaborated relaxometer NMR-NP2. Made the calculation of the rotating magnetic resonance source, its optimization and physical, mathematical modeling of its function in Matlab Simulink program.
CONCLUSION. The survey of methodic and instrumental equipment of oilmining deposits showed, that control of studied oil characteristics is carried in laboratories, expensive and long in time, there is no instrumental method of ARP determination and removing. Were received experimental equations for the asphaltene-resins control in the range 0-30% withthe accuracy of »±2 %, for paraffinsin the range 0-30% withaccuracy »± 3 %, droplets distribution in the range 1-20 mm withaccuracy »± 1mm, offered the installation for ARP removing from oil.

PURPOSE. Development of a laboratory unit for a compressed air energy storage and calculation of its operating modes using Aspen HYSYS and ANSYS software packages.
METHODS. The authors have developed an experimental unit of a compressed air energy storage and calculation with a capacity of 1 kW. The principle of operation of the unit consists in pumping compressed air into the receiver by a compressor, followed by the release of air from the receiver into the expander of the original design, which generates electrical energy.
RESULTS. During the development of the prototype, 4 gears were made of various structural materials: AISI 304 stainless steel, LS59-1 brass and POM-S polyacetal. During assembly, lapping and running-in, it was found experimentally that the optimal solution in terms of antifriction characteristics, strength and longer service life is the use of gears made of polyacetal. To simulate the operating modes of the laboratory stand, a model was compiled in the Aspen HYSYS software package. The need for a dynamic model arose to simulate the process of unloading the receiver. A graph of the change in air flow at the inlet to the expander depending on the position of the control valve is presented.
CONCLUSION. The advantages of using CAES as a method of accumulating electrical energy include high maneuverability and operation in wide ranges of temperature and pressure, which makes such power plants cheaper and more durable. The CAES accumulates energy in the form of compressed air, which then goes to generate electricity during peak loads.