Pub Date : 2024-02-08DOI: 10.3103/s1068371223120040
A. B. Balametov
Abstract
Measurements of active power losses to corona in overhead transmission lines of ultrahigh voltage have established that these losses are a function of voltage (fourth to eighth) degree. A methodology, algorithm, and software implementation for modeling an active power losses to corona as a voltage function are proposed, taking into account the voltage distribution along the line. A program has been developed in the form of a computational module based on a long-line equation. Active power losses to corona are taken into account in the form of nonlinear conductivity. The program can be used to simulate steady-state conditions of AC overhead lines, as well as in design, analysis of optimal operating modes, and comparative analysis of the accuracy of simplified models.
{"title":"Modeling of the Overhead-Line Mode Using Long-Line Equations Taking into Account Corona Losses","authors":"A. B. Balametov","doi":"10.3103/s1068371223120040","DOIUrl":"https://doi.org/10.3103/s1068371223120040","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Measurements of active power losses to corona in overhead transmission lines of ultrahigh voltage have established that these losses are a function of voltage (fourth to eighth) degree. A methodology, algorithm, and software implementation for modeling an active power losses to corona as a voltage function are proposed, taking into account the voltage distribution along the line. A program has been developed in the form of a computational module based on a long-line equation. Active power losses to corona are taken into account in the form of nonlinear conductivity. The program can be used to simulate steady-state conditions of AC overhead lines, as well as in design, analysis of optimal operating modes, and comparative analysis of the accuracy of simplified models.</p>","PeriodicalId":39312,"journal":{"name":"Russian Electrical Engineering","volume":"4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139770314","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-08DOI: 10.3103/s1068371223120118
N. Md. Rakhman, D. R. Farrakhov
Abstract
Increasing the number of phases in step-down dc converters allows to increase power and has a positive effect on the energy efficiency of the converters. However, there is a problem of phase-current imbalance in such converters, which leads to uneven loading of the phases and does not allow to achieve the design power and efficiency. The article provides an overview of existing methods for current balancing in multiphase converters, and discusses their advantages and disadvantages.
{"title":"Methods of Balancing Phase Currents in Multiphase Step-Down DC Converters","authors":"N. Md. Rakhman, D. R. Farrakhov","doi":"10.3103/s1068371223120118","DOIUrl":"https://doi.org/10.3103/s1068371223120118","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Increasing the number of phases in step-down dc converters allows to increase power and has a positive effect on the energy efficiency of the converters. However, there is a problem of phase-current imbalance in such converters, which leads to uneven loading of the phases and does not allow to achieve the design power and efficiency. The article provides an overview of existing methods for current balancing in multiphase converters, and discusses their advantages and disadvantages.</p>","PeriodicalId":39312,"journal":{"name":"Russian Electrical Engineering","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139770338","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-08DOI: 10.3103/s1068371223120106
M. V. Okhotnikov, I. G. Lisovin, V. E. Vavilov, F. R. Ismagilov
Abstract
The possibility of combining the starter and generator functions in a single device and its integration directly into a gas-turbine engine is considered. An assessment is made of the positive effect of the proposed integration, which is expressed in a reduction in weight and size and labor intensity during maintenance. Structural modeling of an integrated starter–generator is performed with an assessment of the temperature indicators determined in the generator elements during its operation. The effectiveness of such a solution is assessed, and further directions of research are outlined.
{"title":"On the Possibility of Introducing an Integrated Starter–Generator into a Gas-Turbine Engine Body","authors":"M. V. Okhotnikov, I. G. Lisovin, V. E. Vavilov, F. R. Ismagilov","doi":"10.3103/s1068371223120106","DOIUrl":"https://doi.org/10.3103/s1068371223120106","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The possibility of combining the starter and generator functions in a single device and its integration directly into a gas-turbine engine is considered. An assessment is made of the positive effect of the proposed integration, which is expressed in a reduction in weight and size and labor intensity during maintenance. Structural modeling of an integrated starter–generator is performed with an assessment of the temperature indicators determined in the generator elements during its operation. The effectiveness of such a solution is assessed, and further directions of research are outlined.</p>","PeriodicalId":39312,"journal":{"name":"Russian Electrical Engineering","volume":"17 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139770311","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-08DOI: 10.3103/s1068371223120143
A. S. Serebryakov, D. A. Semenov, E. A. Sbitnev, A. V. Sidorova
Abstract
One of the methods for the diagnostics of the main insulation of power oil transformers is considered. The testing results for the main insulation of distribution and furnace transformers having different purpose and design are presented for three modes of operation: for a mode with no tank and oil, for a mode without oil and with a tank, and for a mode with a transformer immersed in an oil-filled tank. According to the results of testing, it has been found that the aging of transformer oil is characterized by a rapidly decaying exponent. Based on this, one can carry out transformer repair in a timely manner according to the technical condition of the transformer to prevent a sudden failure of the transformer.
{"title":"The Effect of Transformer-Oil Aging on the Residual Service Life of the Transformer and Its Diagnostic Parameters","authors":"A. S. Serebryakov, D. A. Semenov, E. A. Sbitnev, A. V. Sidorova","doi":"10.3103/s1068371223120143","DOIUrl":"https://doi.org/10.3103/s1068371223120143","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>One of the methods for the diagnostics of the main insulation of power oil transformers is considered. The testing results for the main insulation of distribution and furnace transformers having different purpose and design are presented for three modes of operation: for a mode with no tank and oil, for a mode without oil and with a tank, and for a mode with a transformer immersed in an oil-filled tank. According to the results of testing, it has been found that the aging of transformer oil is characterized by a rapidly decaying exponent. Based on this, one can carry out transformer repair in a timely manner according to the technical condition of the transformer to prevent a sudden failure of the transformer.</p>","PeriodicalId":39312,"journal":{"name":"Russian Electrical Engineering","volume":"10 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139770593","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-08DOI: 10.3103/s106837122312009x
A. V. Mesropyan, E. A. Pronin, E. O. Zharkov, I. F. Sayakhov, O. A. Yushkova
Abstract
Results of designing a starter–generator cooling system are presented. Based on the results of numerical calculations, an optimal design is selected that provides maximum cooling upon meeting all the requirements.
{"title":"A Cooling Jacket Design for a Starter–Generator Body","authors":"A. V. Mesropyan, E. A. Pronin, E. O. Zharkov, I. F. Sayakhov, O. A. Yushkova","doi":"10.3103/s106837122312009x","DOIUrl":"https://doi.org/10.3103/s106837122312009x","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Results of designing a starter–generator cooling system are presented. Based on the results of numerical calculations, an optimal design is selected that provides maximum cooling upon meeting all the requirements.</p>","PeriodicalId":39312,"journal":{"name":"Russian Electrical Engineering","volume":"255 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139770474","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-08DOI: 10.3103/s1068371223120155
R. R. Urazbakhtin, V. E. Vavilov, F. R. Ismagilov, D. F. Norkin
Abstract
Methods of designing electric motors for unmanned aerial vehicles (UAVs) are considered. The analysis shows that there is no established methodology for designing UAV electric motors that would take into account the peculiarities of their performance in various modes and allow determining the most efficient operating range of the electric motor. A method of designing UAV electric motors tied to their running modes is proposed. The method of designing an electric motor for UAVs in the Ansys Maxwell applied software suite is described.
{"title":"Design of Electric Motors for Unmanned Aerial Vehicles","authors":"R. R. Urazbakhtin, V. E. Vavilov, F. R. Ismagilov, D. F. Norkin","doi":"10.3103/s1068371223120155","DOIUrl":"https://doi.org/10.3103/s1068371223120155","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Methods of designing electric motors for unmanned aerial vehicles (UAVs) are considered. The analysis shows that there is no established methodology for designing UAV electric motors that would take into account the peculiarities of their performance in various modes and allow determining the most efficient operating range of the electric motor. A method of designing UAV electric motors tied to their running modes is proposed. The method of designing an electric motor for UAVs in the Ansys Maxwell applied software suite is described.</p>","PeriodicalId":39312,"journal":{"name":"Russian Electrical Engineering","volume":"2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139770346","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-08DOI: 10.3103/s1068371223120167
V. E. Vavilov, I. Kh. Khairullin, E. I. Mustaev, D. F. Norkin, R. R. Urazbakhtin
Abstract
A technique for determining the drag torque of an air propeller incorporated into the propeller group of a drone using three-dimensional numerical simulation with the use of the STAR CCM+ software package is presented. The aerodynamic characteristics of the propeller calculated with the use of computational gas-dynamics approaches are presented. The electric-motor calculation for a drone has been carried out with the use of the RMxprt and ANSYS Maxwell software packages. The main machine operating parameters of the electric machine are presented. The motor torque and propeller drag torque have been compared.
摘要 介绍了利用 STAR CCM+ 软件包进行三维数值模拟，确定无人机螺旋桨组中空气螺旋桨阻力力矩的技术。介绍了利用计算气体动力学方法计算出的螺旋桨空气动力特性。使用 RMxprt 和 ANSYS Maxwell 软件包对无人机的电机进行了计算。介绍了电机的主要运行参数。比较了电机扭矩和螺旋桨阻力矩。
{"title":"Calculation of the Propeller Group for a Drone in Takeoff Mode","authors":"V. E. Vavilov, I. Kh. Khairullin, E. I. Mustaev, D. F. Norkin, R. R. Urazbakhtin","doi":"10.3103/s1068371223120167","DOIUrl":"https://doi.org/10.3103/s1068371223120167","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>A technique for determining the drag torque of an air propeller incorporated into the propeller group of a drone using three-dimensional numerical simulation with the use of the STAR CCM+ software package is presented. The aerodynamic characteristics of the propeller calculated with the use of computational gas-dynamics approaches are presented. The electric-motor calculation for a drone has been carried out with the use of the RMxprt and ANSYS Maxwell software packages. The main machine operating parameters of the electric machine are presented. The motor torque and propeller drag torque have been compared.</p>","PeriodicalId":39312,"journal":{"name":"Russian Electrical Engineering","volume":"102 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139770472","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-08DOI: 10.3103/s1068371223120131
I. F. Sayakhov, O. A. Yushkova, A. A. Zherebtsov, E. A. Pronin, V. E. Vavilov
Abstract
Dual-phase magnetic material, despite the complex technology of its production, remains one of the promising design solutions for a number of electric machines, which can remove their inherent disadvantages and improve their output characteristics. The possibility of controlling the magnetic flux direction increasingly strongly attracts research community’s attention; however, most of the issues are still not covered in publications. One of them is maintenance of satisfactory mechanical characteristics of rotors with permanent magnets recessed into the magnetic circuit to increase the maximum possible rotation speed. Mechanical characteristics of the rotor with permanent magnets recessed into the magnetic circuit are analyzed. Numerical calculation show that the use of a two phase magnetic material can significantly enhance the mechanical strength of the rotor and increase the maximum possible rotational speed.
{"title":"On the Mechanical Strength of Rotors with a Dual-Phase Magnetic Material","authors":"I. F. Sayakhov, O. A. Yushkova, A. A. Zherebtsov, E. A. Pronin, V. E. Vavilov","doi":"10.3103/s1068371223120131","DOIUrl":"https://doi.org/10.3103/s1068371223120131","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Dual-phase magnetic material, despite the complex technology of its production, remains one of the promising design solutions for a number of electric machines, which can remove their inherent disadvantages and improve their output characteristics. The possibility of controlling the magnetic flux direction increasingly strongly attracts research community’s attention; however, most of the issues are still not covered in publications. One of them is maintenance of satisfactory mechanical characteristics of rotors with permanent magnets recessed into the magnetic circuit to increase the maximum possible rotation speed. Mechanical characteristics of the rotor with permanent magnets recessed into the magnetic circuit are analyzed. Numerical calculation show that the use of a two phase magnetic material can significantly enhance the mechanical strength of the rotor and increase the maximum possible rotational speed.</p>","PeriodicalId":39312,"journal":{"name":"Russian Electrical Engineering","volume":"80 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139770348","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-08DOI: 10.3103/s1068371223120052
A. Yu. Demin, D. Yu. Pashali, O. A. Yushkova, A. A. Podguzov
Abstract
This paper analyzes the main factors affecting the reliability of submersible electric motors and their failure rate. The main reliability criteria of submersible electric motors and quantitative indicators for their assessment are selected. A reliability calculation and analysis of winding wires used in submersible electric motors are carried out, and recommendations on the submersible electric motor reliability are provided.
{"title":"Assessment of Submersible Electric-Motor Reliability","authors":"A. Yu. Demin, D. Yu. Pashali, O. A. Yushkova, A. A. Podguzov","doi":"10.3103/s1068371223120052","DOIUrl":"https://doi.org/10.3103/s1068371223120052","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>This paper analyzes the main factors affecting the reliability of submersible electric motors and their failure rate. The main reliability criteria of submersible electric motors and quantitative indicators for their assessment are selected. A reliability calculation and analysis of winding wires used in submersible electric motors are carried out, and recommendations on the submersible electric motor reliability are provided.</p>","PeriodicalId":39312,"journal":{"name":"Russian Electrical Engineering","volume":"6 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139770341","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-08DOI: 10.3103/s1068371223120027
Yu. V. Afanasyev, D. Yu. Pashali, V. E. Vavilov, I. Kh. Khairullin, O. A. Yushkova
Abstract
An aircraft electric-generator design and method of cooling it are considered that allow one to increase the cooling intensity, reduce or eliminate the pumping of refrigerant, and, ultimately, increase the generator’s energy efficiency and reduce weight or increase the load. It has been established that the level of achieved efficiency depends mainly on the Seebeck and Peltier coefficients of semiconductor materials for converters and the ability to choose the location of thermoelements on the engine with the maximum temperature difference.
{"title":"Improvement of Aviation Electric-Generator Cooling Efficiency by Means of Thermoelectric Converters","authors":"Yu. V. Afanasyev, D. Yu. Pashali, V. E. Vavilov, I. Kh. Khairullin, O. A. Yushkova","doi":"10.3103/s1068371223120027","DOIUrl":"https://doi.org/10.3103/s1068371223120027","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>An aircraft electric-generator design and method of cooling it are considered that allow one to increase the cooling intensity, reduce or eliminate the pumping of refrigerant, and, ultimately, increase the generator’s energy efficiency and reduce weight or increase the load. It has been established that the level of achieved efficiency depends mainly on the Seebeck and Peltier coefficients of semiconductor materials for converters and the ability to choose the location of thermoelements on the engine with the maximum temperature difference.</p>","PeriodicalId":39312,"journal":{"name":"Russian Electrical Engineering","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139773313","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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