Global Energy

RAR RUS 7-24 Shakirov Mansur manshak@mail.ru UNIVERSAL AUTOTRANSFORMER THEORY: PART 2 new kind of an equivalent circuit of the two-winding autotransformer with a clear distinction between flows of electric and electromagnetic power has been discovered. It is shown that the presented model has important methodological significance as it allows to clearly display triangles of each power flow in all modes of operation of the autotransformer on vector diagrams along with the currents and voltages. Completeness of vector diagrams is achieved by separately displaying on them the magnetic fluxes in steel, thicker windings and the gap between them. We have obtained a high degree of clarity in explaining the overstimulation of certain parts of the steel in a short-circuited autotransformer and in deriving the formula for determining super- and anti -fluxes (compared to idling fluxes) in this mode directly from the vector diagram. The presented equivalent circuit serves the step-up and to the step-down autotrans formers at the same time, and is responsive to the saturation of their magnetic system in steady and transient processes. 10.18721/JEST.230401 621.313 AUTOTRANSFORMER; PRIMARY AND SECONDARY WINDINGS; MAGNETIC FLUX; SHORT CIRCUITED; EQUIVALENT CIRCUIT; IDLING https://engtech.spbstu.ru/article/2017.102.1/ 1_shakirov.pdf

RAR RUS 25-39 Zabelin Nikolay n.zabelin.turbo@mail.ru Saichenko Andrei asaychenko@mail.ru Sivokon' Viktor 55752274100 Gazprom Transgaz Saint-Petersburg, Russia Fokin Georgy gfokin@spb.ltg.gazprom.ru.

Bronevaya Ulitsa, 4, Sankt-Peterburg, Russia, 198188

EXPERIMENTAL STUDY OF A 280-KW ORGANIC RANKINE CYCLE TURBINE MODEL This article considers the development of principles of modeling Organic Rankine Cycle (ORC) turbine stages for subsequent test rig studies with air as the working fluid. The article contains information about modeling a 280-kW ORC turbine stage with a hexametildisiloxane working fluid. The modeling process was carried out in the ANSYS software package. Four modeled regimes of the ORC turbine’s fractional load were calculated with minimum deviation of similarity criteria of the ORC and its air model turbine stages. A physical study of the air model of the ORC turbine was performed next at the test rig with air as a working fluid. The research showed that the integral characteristics of numerical calculation of the ORC turbine and its air model turbine have a deviation up to 3%. The obtained results allow to carry out experimental studies of air models of turbine stages on available test rigs when manufacturing ORC turbines in the future further if numerical calculation shows that organic working fluid simulation is possible. Further research can be aimed at studying the formation of vortex and stall zones at modeled regimes using five-channel probes and the PIV method (Particle Image Velocimetry). 10.18721/JEST.230402 621.165 ORGANIC RANKINE CYCLE; ORGANIC FLUID; HEXAMETHYLDISILOXANE; TURBINE; MODELING; NUMERICAL CALCULATION; RESEARCH; AIR https://engtech.spbstu.ru/article/2017.102.2/ 2_zabelin.pdf

RAR RUS 40-47 Grishin Nikolai kostroma44@gmail.com LEAKAGE REACTANCE IN A STATOR OF A SIX-PHASE MAXIMUM CAPACITY TURBINE GENERATOR Six-phase turbine generators are used in constructing high-power units of power plants. Issues of operation conditions of a six-phase turbine generator could be studied by analogy with three-phase machines based on the equations of state of two mutually perpendicular axes of the Park-Gorev form given for an idealized machine. Compared with traditional three-phase machines, this approach is different by its representation of the stator’s leakage reactance as consisting of two components: self and mutual leakage reactance of three-phase winding systems. Th proposed analytical estimate of the parts of stator leakage reactance has a short working time, is physically clear and its accuracy is satisfactory for practical issues, which is confirmed by the results of numerical calculations and experiments. In an effort to provide experimental estimation of the components of stator leakage reactance, a few methods based on well-known methods of three-phase machines were proposed. 10.18721/JEST.230403 621.313.322–81 TURBINE GENERATORS OF ULTIMAE CAPACITY; SIX PHASE TYRBOGENERATORS; STATOR LEAKAGE REACTANCE; CALCULATION OF ELECTRICAL MACHINES; SYNCHRONOUS MACHINES TESTS. https://engtech.spbstu.ru/article/2017.102.3/ 3_grishin.pdf

RAR RUS 48-55 56825574900 Peter the Great St. Petersburg Polytechnic University, Russia Gumeniuk Vasiliy kaf-uzchs@mail.ru

Russia, 195251, St.Petersburg, Polytechnicheskaya, 29

Tolochko Ivan Tumanov Alexander toumanov@mail.ru DEVELOPMENT OF A SYSTEM FOR MONITORING EMERGENCY SITUATIONS AT POWER ENGINEERING FACILITIES It has been substantiated that it is necessary to improve the efficiency of prearranged measures for eliminating emergencies in the power industry. Effective information traffic was determined as a foundation for decreasing the economic damage from emergency situations. The legal basis of the existing system of information traffic and the basic principles of the state policy of the Russian Federation in this area have been identified. The monitoring of risks has been categorized by type of organization performing the monitoring. The procedure of information traffic aimed at preventing and controlling emergencies in Russian Federation was structured. We have developed propositions on increasing the efficiency of the interactions between the concerned parties as a part of the monitoring system in the power industry for reducing the reaction time and economic damage from emergency situations. We have defined the principal directions of development of the monitoring system in the power industry: organizational, technical and international co-operation. 10.18721/JEST.230404 355.582 EMERGENCY SITUATION; POWER ENGINEERING FACILITY; MONITORING; COMMUNICATION; INFORMATION TRAFFIC; FORECASTING https://engtech.spbstu.ru/article/2017.102.4/ 4_gumenyuk.pdf

RAR RUS 56-65 Ivanchenko Igorʼ hydroturbo@ckti.ru Topazh Grigory Kostruba Artiom USING WATER TURBINES OPERATING AT VARIABLE SPEED FOR IMPROVING THE EFFICIENCY OF RECONSTRUCTED HYDROELECTRIC POWER STATIONS We have proposed a practical method for calculating the main parameters of a hydroturbine (diameter and range of changes in the rotational speed of the blade runner) which ensure a maximum output of electric power at the hydroelectric power station due to a variable frequency of rotation at specified operating conditions. We have proved the principal possibility of replacing a Kaplan double regulated turbine with a propeller turbine which, when operating at a variable speed at actual operating conditions, is not inferior to a hydro turbine by its energy parameters. Propeller hydro turbines with a variable frequency of rotation are proposed for reconstructing the Irkutsk HPP. The optimal blade angle of the blade runner and the variation range of rotation frequencies for operating with a variable rotation speed were calculated. The operational characteristic of the proposed propeller turbine was determined. 10.18721/JEST.230405 621.22 HYDRO TURBINE; SPEED; EFFICIENCY; CALCULATION; HEAD; POWER; UNIVERSAL CHARACTERISTIC https://engtech.spbstu.ru/article/2017.102.5/ 5_ivanchenko.pdf

RAR RUS 66-73 Nguyen An anquang12a1@mail.ru Lapshin Kirill kirill.lapschin@gmail.com THE INFLUENCE OF TANGENTIAL INCLINATION OF ROTOR BLADES ON KINETIC ENERGY LOSSES IN AN AXIAL TURBINE STAGE The influence of tangential inclination of rotor blades on the characteristics, flow structure and kinetic energy losses in an axial turbine stage were explored. Calculation models of the stages with tangential inclination of the rotor blades were constructed and 3D-testing gas-dynamic calculations were performed in ANSYS CFX. The graphs of the efficiency index, the degree of reactivity and the coefficient of the total kinetic energy losses at variable rotor frequency were presented. The distributions of the flow parameters (output speed from the turbine stage and the coefficient of kinetic energy losses for the guide vanes and the impellers) were given by the height of the blade. The calculation results between turbine stages with different tangential inclination of the rotor blades were compared. The conclusion about the influences of tangential inclination of the rotor blades and the rational application on the characteristics, flow structure and kinetic energy losses of the axial turbine stages was given. 10.18721/JEST.230406 621.165.001.2: 621.438.001.2 TURBINE STAGE; TANGENTIAL INCLINATION OF THE ROTOR BLADES; KINETIC ENERGY LOSSES; DEGREE OF REACTIVITY; ANSYS CFX https://engtech.spbstu.ru/article/2017.102.6/ 6_nguen.pdf

RAR RUS 74-88 Khazov Maksim Chernyaev Piotr Belyaev Andrey andrey.belyaev@gmail.com ANALYSIS OF OPERATING CONDITIONS AND STABILITY OF INTERCONNECTIONS BASED ON FLEXIBLE AC TRANSMISSION LINES WITH CONTROLLED SERIES AND SHUNT COMPENSATION DEVICES The paper describes a study on the operating conditions and small signal stability of flexible AC transmission lines with controlled series and shunt compensation. It is shown that the installation of controllable shunt compensation devices in addition to the existing series allows to increase the transmission power limit by almost two times, provided that the voltage levels are kept within the permissible limits. The minimally possible optimal composition and location of the controlled shunt compensation devices is established to ensure the operation of power transmission in a wide range of power transmission. A set of measures aimed at increasing the static stability margin is justified. The joint coordination of tuning parameters of the series and shunt control devices is implemented. 10.18721/JEST.230407 621.313.322 FLEXIBLE ALTERNATIVE CURRENT TRANSMISSION SYSTEM; THRYSTOR CONTROLLED SERIES COMNESATION; SMALL SIGNAL STABILITY; CONTROLLED SHUNT REACTOR; STATIC VAR COMPENSATOR https://engtech.spbstu.ru/article/2017.102.7/ 7_khazov.pdf

RAR RUS 89-97 Georgievskaia Evgeniia THE ENERGY APPROACH FOR ASSESSMENT OF DYNAMIC STRESSES IN HYDRAULIC TURBINES Determination of dynamic stresses is an important step in assessing the strength, reliability and lifetime of hydraulic turbines. The diversity and complexity of dynamic processes in the flow part of hydraulic units cause major difficulties in their formalization and numerical simulations even for the steady state near the best efficient point. Experimental methods for determining dynamic stresses in the critical elements of full-scale hydraulic turbines, primarily the blade runner system, have a high cost, and the equipment has to be stopped for a long time for preparatory operations to be performed. Model experiments are usually carried out only at the design stage, which does not reflect all the specifics of hydraulic unit operation at the HPP. The approach to determining the actual dynamic stresses in the runner blades of a hydraulic turbine proposed in this article allows carrying out a quick estimate “from above” on the basis of the Hill chart of the turbine. The approach is based on the relationship between the level of dynamic perturbation flow in the flow part of the hydraulic turbine and the total energy losses affecting the efficiency value for this regime, and also the linear dependence of maximum stresses in the blade on the power for the given head values and rotation speed. A comparison of the experiments and the estimates conducted by the author proves the validity and feasibility of the proposed approach. 10.18721/JEST.230408 621.224 HYDROTURBINE; STRENGTH; RELIABILITY; LIFETIME; DYNAMIC STRESSES; HILL CHART https://engtech.spbstu.ru/article/2017.102.8/ 8_georgievskaya.pdf

RAR RUS 98-109 Nazarythev Alеksandr Novoselov Evgenii Strakhov Aleksandr Skorobogatov Andrei B-7916-2013 6601971248 0000-0002-1173-8727 Peter the Great St. Petersburg Polytechnic University, Russia Korovkin Nikolay nikolay.korovkin@gmail.com

Russia, 195251, St.Petersburg, Polytechnicheskaya, 29

SPECTRUM ANALYZER BASED ON AN AUTOCORRECTION ALGORITHM OF TIME RECORDING Spectral analysis of signals is the main tool in the development of new functional methods for monitoring asynchronous electric motors. The article describes a spectrum analyzer based on an autocorrection algorithm of time recording. The algorithm allows to minimize the effect of spectral leakage on the results of spectral analysis, which significantly increases the accuracy. The analyzer is designed to accurately determine the parameters of harmonics characteristic for the signals generated by asynchronous motors. A comparison is made with the traditional methods of spectral analysis based on the fast Fourier transform and the Windowed Fourier transform. The developed spectrum analyzer provides a higher accuracy of determining the amplitudes and frequencies of harmonic components of the signal spectrum in comparison with traditional methods. Another advantage is the high stability of the results, which is retained even with the reduction of the signal recording time up to one second. 10.18721/JEST.230409 621.313.3 621.317 ASYNCHRONOUS ELECTRIC MOTOR; SPECTRAL ANALYSIS; SPECTRAL LEAKAGE; FAST FOURIER TRANSFORM; WINDOWED FOURIER TRANSFORM; AMPLITUDE ERROR; FREQUENCY ERROR https://engtech.spbstu.ru/article/2017.102.9/ 9_nazarychev.pdf

RAR RUS 110-117 Morachevski Andrey morachevski@mail.ru Popovich Anatoliy popovicha@mail.ru Demidov Alexander ph-chem@ftim.spbstu.ru NEW TRENDS OF SODIUM-SULFUR BATTERIES DEVELOPMENT This paper reviews foreign publications on room temperature sodium-sulfur batteries research of the last decade (2007-2017). Until the end of the last century, a number of companies produced sodium-sulfur batteries with β-alumina solid electrolyte and operating temperatures of 320–340 °C. Along with high electrochemical indices, their important advantage was low cost and unlimited natural reserves of the raw materials, sodium and sulfur. There is every reason to believe that current studies will eliminate the main drawback of the original design of the sodium-sulfur battery, that is, a high operating temperature, without losing its advantages. Lithium-ion batteries, which have become widespread over the past 25 years, remain expensive, lithium natural reserves are limited, and the collection and recycling of used lithium-ion batteries is problematic. 10.18721/JEST.230410 621.355 NA-S SYSTEM; SODIUM-SULFUR BATTERY; RECHARGEABLE BATTERIES; SODIUM ELECTRODE; SULFUR ELECTRODE https://engtech.spbstu.ru/article/2017.102.10/ 10_morachevskiy.pdf

RAR RUS 118-126 Zolotov Alexander prf_zam@mail.ru Chizhik Tatyana Chizhik_TA@lmz.power-m.ru Smirnov Maksim DRAWING THE THIRD KIND RECRYSTALLIZATION CURVES OF TITANIUM ALLOY VT6 The last-stage working blade of the low-pressure cylinder of steam turbines is a high-tech and critical part that requires continuous improvement of manufacturing technology with the aim of improving operation factors and mechanical properties. Stamping and heat treatment are structure-forming operations, they determine the level and stability of turbine blades’ properties. This study is aimed at investigating the parameters of the thermal process of stamping the blanks of turbine blades made of titanium alloy VT6. The equipment for tests was engineered and manufactured, auxiliary calculations were performed. The compression tests with subsequent thermal treatment were performed. Recrystallization curves of the titanium alloy VT6 for two heat treatment conditions were constructed. We investigated three deformation degrees and test temperatures. The microstructure analysis of the tested specimens was carried out. 10.18721/JEST.230411 621.73: 669.295 RECRYSTALLIZATION CURVES; TITANIUM ALLOY; PLASTIC DEFORMATION; TURBINE BLADE; MICROSTRUCTURE https://engtech.spbstu.ru/article/2017.102.11/ 11_zolotov.pdf

RAR RUS 127-131 Demidov Alexander ph-chem@ftim.spbstu.ru Markelov Iliya PHASE TRANSITIONS IN THE IRON-OXYGEN SYSTEM AND THEIR THERMODYNAMIC PROPERTIES Using the example of the Fe-O system, the expediency of writing chemical formulas per mole of atoms of the compound is shown. This approach allowed us to balance phase transition reactions, using the level rule, to compare the thermodynamic properties of compounds and to conduct thermodynamic calculations of the reactions of wüstite decomposition and the formation of hematite by oxidizing magnetite with oxygen. Magnetite Fe0,429O0,571 is characterized by more negative values of Gibbs free energy of formation in comparison with hematite Fe0,400O0,600 in the temperature range of 1000–1800 K. 10.18721/JEST.230412 669.2 IRON; OXYGEN; IRON OXIDES; PHASE TRANSITIONS; THERMODYNAMIC PROPERTIES https://engtech.spbstu.ru/article/2017.102.12/ 12_demidov.pdf

RAR RUS 132-109 Kotov Sergey Muzafarova Svetlana-Viktoriia Safronov Dmitrii Baturova Ludmila INVESTIGATION OF THE PROCESSES OF OBTAINING HIGH-POROUS ELECTRODES FROM POWDERS OF THERMALLY EXPANDED GRAPHITE A pulsed capacitive energy storage must provide a high discharge current and a nominal capacity, a long persistence of the charge and a high discharge time constant. A liquid condenser can be used as the storage element in pulsed capacitive energy storage. In this paper, the thermally expanded graphite was chosen as a material of the capacitor plates. Thermally expanded graphite is characterized by a highly developed inner surface. Our studies have shown that the adsorption layer characterized by the high capacity is formed from expanded graphite electrodes. In addition, the paper presents the investigation results of compaction of expanded graphite powders. The methods of forming the electrodes on the basis of expanded graphite powders for energy sources have been considered. Investigations have been carried out on the electrochemical properties of the obtained electrodes. These investigations allow recommending the use of thermally expanded graphite as the electrode material for electrodes of liquid capacitors. 10.18721/JEST.230413 621.762 THERMALLY EXPANDED GRAPHITE; POWDER; COMPACTABILITY; ELECTRODE; PRESSING; ELECTROCHEMISTRY; POROSITY https://engtech.spbstu.ru/article/2017.102.13/ 13_kotov.pdf

RAR RUS 141-148 Medvedeva Viktoriia THE RHEOLOGICAL FEATURES OF LUBRICATING MATERIALS CONTAINING DISPERSED FILLERS BASED ON HYDROSILICATES OF MAGNESIUM The effect of dispersed fillers based on magnesium hydrosilicates on the rheological properties of grease is studied. On the basis of an alternative approach to the theory of viscoelastic interaction, taking into account the change in viscosity from the structure change, the coefficients for the Ree and Eyring formula are determined, which govern the nonuniformity of the lubricant. Such coefficients are directly related to the structure and physicomechanical properties. Based on the structural properties of greases, the optimum content of talcite and serpentinite fillers was determined, and the relationship between the number of structural components and its rheology was shown. 10.18721/JEST.230414 665.765 LUBRICANTS; RHEOLOGY OF GREASE; NON-NEWTONIAN FLUIDS; VISCOSITY; RHEOLOGICAL MODELS https://engtech.spbstu.ru/article/2017.102.14/ 14_medvedeva.pdf

RAR RUS 149-158 Fedyaev Vladimir Osipov Petr Beljaev Aleksey Sirotkina Liliya MATHEMATICAL MODELING OF THE PROCESSES OCCURRING DURING ELECTRICAL CONTACT WELDING OF PARTS WITH COATINGS Spot electrical contact welding of parts with coatings is considered. The aim of this work is a mathematical description of the thermal processes that occur during electrical contact welding of parts with coatings and determining the specifics of their heating. To describe the thermal processes occurring in these conditions, a mathematical model is proposed that allows, under certain assumptions, an assessment of the presence of low-melting coatings by a sudden change in the thermal and electric resistance, contact area of the welded parts, parts and electrodes. In the course of numerical experiments, when welding three parts of the same thickness, the above-mentioned parameters vary, as well as the heat flux in the radial direction. The obtained results, in general, are consistent with the available concepts and allow evaluating the dynamics of temperature growth in electrodes and parts, as well as an increase in the size of the welding core. 10.18721/JEST.230415 621.791.357 MODELING; WELDING; PROCESSES; DEFECTS; PARTS; COATINGS https://engtech.spbstu.ru/article/2017.102.15/ 15_fedyaev.pdf

RAR RUS 159-171 Chernukha Nikita Lalin Vladimir Birbraer Adolf PROBABILISTIC JUSTIFICATION OF DYNAMIC LOADS ON NPP EQUIPMENT CAUSED BY AIRCRAFT IMPACT The article is dedicated to the problem of justification of dynamic loads on NPP process equipment, caused by aircraft impact. Usually these loads are set by means of floor response spectra (FRS). Nowadays, a conservative deterministic approach is used in practice, when the maximum possible FRS is taken in NPP process equipment design. Since aircraft crash on NPP is an extremely rare random event, it is necessary to use the probabilistic approach to analyze dynamic loads on NPP equipment. The method of FRS calculation with the required non-exceedance probability is given. The following random variables are considered: point and angle of aircraft impact, distance between point of impact and equipment support. Probabilistic justification of dynamic loads on NPP equipment caused by intentional aircraft crash (act of terrorism) is presented. The procedure for summing the corresponding internal forces, calculated using three components of FRS, is given. The criterion of the optimal step for integrating the equations of motion when calculating the forced oscillations of structures under aircraft impact is determined. 10.18721/JEST.230416 629.039.58 NPP; AIRCRAFT IMPACT; INTENTIONAL AIRCRAFT CRASH; ACT OF TERRORISM; LOADS ON EQUIPMENT; FLOOR RESPONSE SPECTRA; NON-EXCEEDANCE PROBABILITY; LOAD COMPONENTS https://engtech.spbstu.ru/article/2017.102.16/ 16_chernukha.pdf

RAR RUS 172-180 Aleksander Levchenya levchenya@yandex.ru 7102545375 Peter the Great St. Petersburg Polytechnic University, Russia Kirillov Alexander ai_kirillov@mail.ru, tot@pef.spbstu.ru

Russia, 195251, St.Petersburg, Polytechnicheskaya, 29

Smirnov Evgeny NUMERICAL SIMULATION OF SEPARATED FLOW IN AN ANNULAR AXIAL-RADIAL DIFFUSER The motivation to setting three-dimensional eddy-resolving computations of turbulent flow in annual ax ial-radial diffusers is given. The results of numerical simulation of separated flow in an annual axial-radial diffuser previously studied experimentally are presented. Using the ANSYS FLUENT package, numerical solutions have been obtained on the basis of the Reynolds-averaged Navier-Stokes equations using different turbulence models, as well as with the Detached Eddy Simulation method. Possibilities of the applied methods for the diffuser efficiency prediction are evaluated by means of comparison of the calculated and experimental data. It has been shown that the loss values calculated by RANS at Re = 1,8×105 are the clos est to the experimental ones in case of the Spalart-Allmaras turbulence model. For this Reynolds number the calculation results produced by the IDDES method and the RANS approach almost coincide. At higher Re values the IDDES method predicts smaller loss values, as compared with RANS. 10.18721/JEST.230417 532.556.4 AXIAL-RADIAL DIFFUSER; TURBULENT FLOW; FLOW SEPARATION; NUMERICAL SIMULATION; EDDY-RESOLVING METHOD https://engtech.spbstu.ru/article/2017.102.17/ 17_levchenya.pdf

RAR RUS 181-190 Sakhno Ludmila lsahno2010@yandex.ru Sakhno Olga Olasahno@mail.ru Fedorov Pavel Radomsky Yurii THE INFLUENCE OF THE TRANSFORMER ON THE POWER CONSUMPTION OF HIGH-FREQUENCY RESISTANCE SPOT WELDING SYSTEMS High-frequency resistance spot welding systems are considered. They have full-wave center-tapped output rectifiers. They find wide application in resistance spot welding, instrument making, electronic industry, nuclear energy and automotive industries. A feature of these systems is a significant influence of electromagnetic parameters of the three-winding transformer included in the system on welding current and power consumption. This three-winding transformer is replaced by two two-winding ones. It is shown that welding current and power consumption depend both on the modulus and the sign of the coupling coefficient of the magnetic leakage fields of these two-winding transformers. For reducing the power consumption of high frequency resistance spot welding systems, it is necessary not only to reduce the leakage inductance of two-winding transformers, which replace the three-winding transformer, but also to reduce the positive coupling coefficient of the magnetic leakage fields or increase the modulus of the negative coefficient 10.18721/JEST.230418 812.35.17.11 SPOT WELDING; INVERTOR; THREE-WINDING TRANSFORMER; EQUIVALENT CIRCUIT; MAGNETIC LEAKAGE FIELD; MAGNETIC COUPLING FACTOR FOR THE LEAKAGE FLUXES https://engtech.spbstu.ru/article/2017.102.18/ 18_sakhno.pdf

RAR RUS 191-203 Lobachev Aleksandr Ashcheulov Aleksandr DATA ANALYSIS OF DRILLING PROCESS TELEMETRY Variants of the analysis of the data received during drilling of deep wells of oil and gas extraction with use of a power top drive are considered. Processing of the collected data of the work process by the methods of mathematical statistics and software package (Matlab Simulink) is performed. An example of a general and multifactor analysis of data coming from sensors, reflecting the correctness of the drilling rig operation, is given. The dependence of the loading of the upper drive on the drilling characteristics of the drilling process is analyzed: the depth of the slaughtering of the weight on the hook, the load on the bit, the rate of descent of the upper drive, the pressure of the drilling mud. The result of the work was recommendations on the application of data obtained in the analysis to increase the demand for top drive. The result of the multifactor analysis is the tables of factor loads of the parameters and characteristics of the drilling process with the identified probable acting factors. In terms of the composition of the parameters that have the greatest factor loads, we can further evaluate the physical cause of the factors selected. Drilling; Power Upper Drive; Dynamic Load Analysis; Impulse; Mathematical Model; Factor Analysis. 10.18721/JEST.230419 62–237 DRILLING; POWER UPPER DRIVE; DYNAMIC LOAD ANALYSIS; IMPULSE; MATHEMATICAL MODEL; FACTOR ANALYSIS https://engtech.spbstu.ru/article/2017.102.19/ 19_lobachev.pdf

PER RUS 204-206 The editorial board of the "Global Energy" 70 YEARS TO PROFESSOR V.V. GLUKHOV -- 10.18721/JEST.230420. -- https://engtech.spbstu.ru/article/2017.102.20/ 20_redkollegiya.pdf

PER RUS 207-211 6603036819 Peter the Great St. Petersburg Polytechnic University, Russia Titkov Vassiliy titkovprof@yandex.ru

Russia, 195251, St.Petersburg, Polytechnicheskaya, 29

Halilov Firudin natalia-shilina@yandex.ru NIKOLAY TIKHODEEV (90 Anniversary) Some facts from biography of N.N. Tikhodeev. 10.18721/JEST.230421 001:929 POWER TRANSMISSION; LONG-DISTANCE POWER TRANSMISSION LINES; HIGH AND ULTRAHIGH VOLTAGE TECHNIQE; UNIFIED ENERGY SYSTEM https://engtech.spbstu.ru/article/2017.102.21/ 21_titkov.pdf