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Comparison of technical characteristics of a multi-vortex separator with cyclones of various modifications 多涡分离器与不同改型旋风分离器技术特性的比较
Power engineering: research, equipment, technology Pub Date : 2023-08-02 DOI: 10.30724/1998-9903-2023-25-3-117-127
V. Zinurov, A. V. Dmitriev, R. Bikkulov, O. Dmitrieva, A. A. Abdullina
{"title":"Comparison of technical characteristics of a multi-vortex separator with cyclones of various modifications","authors":"V. Zinurov, A. V. Dmitriev, R. Bikkulov, O. Dmitrieva, A. A. Abdullina","doi":"10.30724/1998-9903-2023-25-3-117-127","DOIUrl":"https://doi.org/10.30724/1998-9903-2023-25-3-117-127","url":null,"abstract":"RELEVANCE. Cyclone separators are used to separate solid dust particles from the air entering the turbine. The key factors in their selection are pressure drop and efficiency. Research aimed at improving these indicators while preserving the other advantages of cyclones, as well as the development of new dust and gas cleaning devices that are not inferior to them, are relevant. THE PURPOSE. Comparison of the technical characteristics of a multi-vortex separator with cyclones of various modifications on the efficiency of separation of particles from a dusty medium, the Froude criterion and the Euler criterion. METHODS. It carried the research out using modern methods of recording parameters on a laboratory stand. RESULTS. The fractional efficiency of separation of solid particles with a size from 1 to 80 microns from the gas stream of a multi-vortex separator is higher than cyclone separators: SK-CN-24, CN-11, CN-15, CN-24. An analysis of the efficiency according to the Froude Fr criterion similarly showed that a multi-vortex separator is preferable to cyclones UC-38-250, UC-38-500, UC-38-750, UC-38-850, SCN-40 and CN-11-400. We establish that with an increase in Fr, the efficiency increases. According to the Euler Eu criterion, it can be established that the use of a multi-vortex separator is carried out with lower energy costs relative to cyclones of the UC modifications with a body diameter of 500 mm or more, SCN-40 and CN-11-400. CONCLUSION. The conducted studies show that the use of a multi-vortex separator can be considered as a replacement for cyclone separators for cleaning the cyclic air of gas turbine installations. Advantages – simplicity of design, absence of friction of vortices on the walls of the separator, low value of the Euler criterion, efficiency close to 100% when capturing particles with a diameter of over 6 μm.","PeriodicalId":222237,"journal":{"name":"Power engineering: research, equipment, technology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133245273","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}
引用次数: 1
Physical simulation of aerodynamic flow characteristics in a vertical diffuser with air supply through different pipe configurations 不同管型送风垂直扩压器内气动特性的物理模拟
Power engineering: research, equipment, technology Pub Date : 2023-06-09 DOI: 10.30724/1998-9903-2023-25-2-187-200
L. Plotnikov, A. Ryzhkov, V. Medvedev, M. D. Smirnykh, L. Osipov
{"title":"Physical simulation of aerodynamic flow characteristics in a vertical diffuser with air supply through different pipe configurations","authors":"L. Plotnikov, A. Ryzhkov, V. Medvedev, M. D. Smirnykh, L. Osipov","doi":"10.30724/1998-9903-2023-25-2-187-200","DOIUrl":"https://doi.org/10.30724/1998-9903-2023-25-2-187-200","url":null,"abstract":"   RELEVANCE. Vertical cone diffusers are used in various technical applications: heat exchangers, gas cleaning units, boilers, industrial furnaces, dryers, ventilation devices, nozzle systems and others. For their efficient operation, it is necessary to ensure a uniform supply of the working medium to the device, which is determined by the characteristics of the flow in thediffuser. Thus, the study of the aerodynamics of technological devices with conical diffusers is an urgent task for gas-dynamic improvement and the search for ways to control flow characteristics.   THE PURPOSE. To establish the evolution of the velocity field along the height of the cylindrical part of the diffuser for different configurations of the supply tubes, and also to determine the magnitude of the change in the intensity of turbulence along the height of the diffuser under different initial conditions based on experimental data on the instantaneous values of the air flow velocity.   METHODS. Measurement of instantaneous values of air flow velocity is carried out using a constant temperature hot-wire anemometer. The article provides data on velocity fields and turbulence intensity along the height and along the diameter of the cylindrical part of the diffuser when air is supplied through tubes of different configurations. Feed tubes with cross sections in the form of a circle, a square and an equilateral triangle were used.   RESULTS. The article provides a detailed description of the experimental stand (including key geometric dimensions), instrumentation and measurement system, and data processing techniques. The ranges of changes in the initial conditions for the experiments are presented. A comparison of the aeromechanical characteristics of flows in a vertical diffuser when air issupplied through different tube configurations is carried out. CONCLUSION. It is shown that in the diffuser there is a drop in the average velocity upstream, which is typical for all configurations of the supply tubes. It has been established that profiled tubes influence the shape of the velocity field. It was found that the values of turbulence intensity vary from 0.05 to 0.39 (the highest values were typical when air was supplied through profiled tubes). It is shown that the intensity of turbulence has its maximum values at a height of 300-350 mm, which is typical for all investigated tube configurations.","PeriodicalId":222237,"journal":{"name":"Power engineering: research, equipment, technology","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115073556","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}
引用次数: 0
Study of methods of online monitoring of parameters of working conditions in JSC «Alatau Zharyk Company» JSC“Alatau zhayk公司”工况参数在线监测方法研究
Power engineering: research, equipment, technology Pub Date : 2023-06-09 DOI: 10.30724/1998-9903-2023-25-2-165-175
A. Abikenova, F. Zhandauletova, T. Sanatova, G. S. Ostemir
{"title":"Study of methods of online monitoring of parameters of working conditions in JSC «Alatau Zharyk Company»","authors":"A. Abikenova, F. Zhandauletova, T. Sanatova, G. S. Ostemir","doi":"10.30724/1998-9903-2023-25-2-165-175","DOIUrl":"https://doi.org/10.30724/1998-9903-2023-25-2-165-175","url":null,"abstract":"   RELEVANCE of the work lies in establishing the relationship between industrial injuries, when online monitoring in the electric grid company, with the influence of hazardous production factors, since the latter is the cause of accidents, Accidents and other occupational hazards of employees and loss of health of employees. For this purpose it is necessary to develop methods of causes, nature and application of systems of prevention and localization of accidents, accidents.   THE PURPOSE. The article discusses possible solutions to an urgent problem - analysis and determination of the causes of industrial injuries and occupational morbidity in the electric power industry and assessment of occupational risks of workers and loss of health of workers at hazardous production facilities, as well as the lack of attention of employers to the reconstruction and modernization of production, the development andapplication of warning systems and localization of accidents, accidents, preventive work, control over the state of the production environment and compliance with sanitary and hygienic requirements, which will generally lead to industrial safety.   METHODS. The main research method was the development and application of systems for the prevention and localization of accidents, accidents, preventive work, monitoring the state of the production environment and compliance with sanitary and hygienic requirements.   RESULTS. The methods of online monitoring of the parameters of working conditions are considered, while the authors carried out special studies of the complex influence of adverse environmental factors and working conditions, which make it possible to unambiguously identify priority etiological factors, as well as sources of impact on the human environment.   CONCLUSION. Attention is drawn to the prospects of the adverse impact ofproduction factors under conditions of intensive technogenic pollution of the environment. The authors believe that in order to increase the effectiveness of socio-hvgienic monitoring in the analysis and forecasting of the impact of the environment on the health of the population, it is necessary to develop objective criteria for assessing both the natural and industrial environment in order to study significant changes and develop measures to improve and improve working conditions and means management of production safety, adaptive capabilities of the body and the prevention of environmental pathology.","PeriodicalId":222237,"journal":{"name":"Power engineering: research, equipment, technology","volume":"71 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126127291","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}
引用次数: 0
Evaluation of turbulence models in the external flow around the heated pipe 热管外流湍流模型的评价
Power engineering: research, equipment, technology Pub Date : 2023-06-09 DOI: 10.30724/1998-9903-2023-25-2-176-186
G. R. Badretdinova, I. R. Kalimullin, V. Zinurov, A. V. Dmitriev
{"title":"Evaluation of turbulence models in the external flow around the heated pipe","authors":"G. R. Badretdinova, I. R. Kalimullin, V. Zinurov, A. V. Dmitriev","doi":"10.30724/1998-9903-2023-25-2-176-186","DOIUrl":"https://doi.org/10.30724/1998-9903-2023-25-2-176-186","url":null,"abstract":"   The study of heat exchange processes using numerical modeling in software systems is a complex operation. In the course of conducting numerical studies on heat transfer, it is necessary to adequately adjust the solution of the problem. To do this, the most suitable turbulence models are selected, grid models are created, and boundary conditions are set. Obtaining reliable results of numerical simulation of heat exchange processes directly dependson setting the correct parameters that need to be analyzed initially, , 4 s  a result of the work on the analysis of the necessary parameters, an adequate solution to the problem can be obtained.   THE PURPOSE. To evaluate the influence of turbulence models on the heat transfer process and to select the most suitable model for numerical simulation of the external flow around the heated pipe. To study the influence of quantitative criteria of the grid model on the accuracy and convergence of the numerical calculation solution.   METHODS. During the numerical simulation, the finite element method was used in the ANSYS Fluent software package.   RESULTS. In the course of the study, the most suitable turbulence model was selected to solve the problem of external flow around the heated pipe. A grid model is constructed taking into account the features of the problem under consideration. The errors are determined depending on the quantitative criteria of the grid model.   CONCLUSION. Numerical studies have made it possible to give a comparative assessment for pipes with different fins. The results obtained showed that replacing pipes with straight fins with spiral ones allows increasing the heat transfer intensity up to 40 %.","PeriodicalId":222237,"journal":{"name":"Power engineering: research, equipment, technology","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126753608","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}
引用次数: 0
Measuring device for systems of technical vibro-diagnosis of power equipment 电力设备技术振动诊断系统测量装置
Power engineering: research, equipment, technology Pub Date : 2023-06-09 DOI: 10.30724/1998-9903-2023-25-2-137-152
I. Bryakin, I. Bochkarev
{"title":"Measuring device for systems of technical vibro-diagnosis of power equipment","authors":"I. Bryakin, I. Bochkarev","doi":"10.30724/1998-9903-2023-25-2-137-152","DOIUrl":"https://doi.org/10.30724/1998-9903-2023-25-2-137-152","url":null,"abstract":"   RELEVANCE. Among the various methods for assessing the technical condition of power equipment, vibration diagnostics occupies an important place. Therefore, improving the quality of hardware for vibration diagnostics is currently extremely important.   THE PURPOSE. To develop a vibration sensor with a new principle of operation for systems of technical vibration diagnostics of power equipment, as well as to theoretically substantiate the performance of the proposed sensor.   METHODS. When solving the set goal, the main provisions of the theory of vibration diagnostics were applied.   RESULTS. A design of the vibration acceleration sensor has been developed, the peculiarity of which is that it is excited by means of constructive coupling capacitors, the first electrode of which is made in the form of a thin-walled metal split cylinder, the role of the second electrodes is performed by the lower row of the winding of each measuring coil, and the function of the inertial element is performed by a screen made in the form of a metal ring fixed on a suspension in the form of a membrane. Based on the electrical equivalent circuit of the sensor, a theoretical substantiation of its operability and efficiency was made. Variants of circuit solutions for the primary and secondary measuring transducers of the measuring device for vibration diagnostics systems have been developed. The primary measuring transducer contains directly a vibration displacement sensor, a sinusoidal voltage source, an input differential measuring amplifier and an analog filter containing a narrow-band filter, a broadband amplifier and a buffer amplifier. The secondary measuring transducer contains a quadrature detector of information signals, an output buffer amplifier and a quadrature reference voltage driver. A block diagram of the hardware solution for the vibration acceleration registration system is also proposed.   CONCLUSION. The developed sensor has improved output characteristics and can be used not only for vibration control of power equipment, but also for measuring mechanical vibrations in technical diagnostic systems of various other machines and mechanisms, as well as for tasks of spectral seismic exploration.","PeriodicalId":222237,"journal":{"name":"Power engineering: research, equipment, technology","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121504652","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}
引用次数: 0
Features of the gas chromatographic method for monitoring the content of phenols in an aqueous medium 气相色谱法监测水介质中酚类物质含量的特点
Power engineering: research, equipment, technology Pub Date : 2023-06-09 DOI: 10.30724/1998-9903-2023-25-2-153-164
A. Taneeva, A. Dmitrieva, V. Novikov
{"title":"Features of the gas chromatographic method for monitoring the content of phenols in an aqueous medium","authors":"A. Taneeva, A. Dmitrieva, V. Novikov","doi":"10.30724/1998-9903-2023-25-2-153-164","DOIUrl":"https://doi.org/10.30724/1998-9903-2023-25-2-153-164","url":null,"abstract":"   THE RELEVANCE. Phenols are one of the main pollutants of the aquatic environment and have a harmful effect on the human body. Therefore, their determination today is an urgent problem.   The purpose of this work is to determine the content of phenols in an aqueous medium by gas chromatographic method using various sorption materials.   To do this, it is necessary to consider some features of the gas chromatographic method for monitoring the content of phenols in an aqueous medium using various sorption materials. Based on a detailed literature review to show that phenols and their derivatives are highly toxic substances, have low values of MPC standards, ha’e a negative impact on the human body, which necessitates their control in the aquatic environment. METHODS. To determine phenols in an aqueous medium, the experimental part of the work was carried out on a Crystallux-4000M gas-liquid chromatograph with a flame ionization detector and nozzle columns filled with various sorbents, as which polyethylene glvcol-1500, SE-30 and arsenated polyethylene glycol PEG(As) were used.   RESULTS. For gas chromatographic separation of phenols and their derivatives, sorption materials of various physicochemical nature were used. It has been established that the most optimal sorbent, which separates almost all phenols and their derivatives, is polyoxyethylene bis arsenate, the molecule of which contains two arsenvl groups capable of intermolecular interactions with the analyzed sorbates.   CONCLUSION. An experimental study of the phenol content in an aqueous medium using a gas-liquid chromatograph Crystallux-4000M was carried out. The characteristics of the retention of phenols on sorption materials  of different physicochemical nature are determined. It is shown that the most complete separation of the individual components of phenol derivatives is carried out on a sorbent prepared on the basis of polyoxyethylene bis arsenate, which is explained by the presence in the structure of its molecule of non-white electron pairs of oxygen atoms capable of intermolecular interactions with the hydroxyl group of phenols. The linear dependence of the logarithm of the relative volume of phenols on their dipole moments and refractive index is established. A deviation from this dependence is obsen’ed for phenols having functional substituents in the ortho-position of the benzene ring. This can be explained by the electronic effect? which leads to steric difficulties during intermolecular interaction in the sorbent - sorbate system. Based on the theoretical studies carried out, it was possible to completely separate the individual components of phenols, especially those with close boiling points. The obtained data were tested in practice when monitoring the content of phenols in the silt drains of the Volga river. This technique of gas chromatographic analysis can be used in the system of ecological monitoring of aquatic ecosystems.","PeriodicalId":222237,"journal":{"name":"Power engineering: research, equipment, technology","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126744392","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}
引用次数: 0
Remote monitoring and control of the status of transformers in distribution electrical networks 配电网变压器状态的远程监测与控制
Power engineering: research, equipment, technology Pub Date : 2023-06-08 DOI: 10.30724/1998-9903-2023-25-2-97-109
V. Levin, P. A. Petushkov, M. A. Shvets
{"title":"Remote monitoring and control of the status of transformers in distribution electrical networks","authors":"V. Levin, P. A. Petushkov, M. A. Shvets","doi":"10.30724/1998-9903-2023-25-2-97-109","DOIUrl":"https://doi.org/10.30724/1998-9903-2023-25-2-97-109","url":null,"abstract":"   RELEVANCE. One of the most important expected effects of digitalization of objects of the power grid complex of the Russian Federation is to increase the level of reliability of its functioning. In this regard, research and development in this direction is undoubtedly relevant.   THE PURPOSE. To propose a mathematical model for monitoring dangerous developing defects in power oil-filled transformers, this would meet the properties of predictability and adaptability. Based on the model, to develop a decision-making algorithm for long-term reliable operation oftransformers.   METHODS: Methods of statistical pattern recognition theory, correlation analysis and Bayesian classification will be used to solve the problems to ensure high reliability of diagnostic assessments, validity and effectiveness of operational solutions.   RESULTS. A predictive model was obtained and verified in the form of a correlation function of a sign of a faulty state of a transformer from the values of its electrical load. An event tree has been formed that restores the causal relationship between the result of monitoring the transformer, the defect sign and the operational decision being made. Based on the event tree and diagnostic evaluation criteria, a control algorithm is implemented, with the help of which calculations are performed confirming the effectiveness of the proposed approach.   CONCLUSION. The possibility of effective application of the developed defect recognition model and operational control algorithm as tools of industrial technology of the Internet of Things is illustrated, in particular, when organizing remote diagnostic monitoring of oil-filled transformer equipment at substations of the distribution grid area.","PeriodicalId":222237,"journal":{"name":"Power engineering: research, equipment, technology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125506325","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}
引用次数: 0
Determination of modern reliability indicators of relay protection and automation devices 继电保护和自动化装置现代可靠性指标的确定
Power engineering: research, equipment, technology Pub Date : 2023-06-08 DOI: 10.30724/1998-9903-2023-25-2-58-70
A. Vinogradov, A. Lansberg, Y. D. Volchkov, A. Vinogradova
{"title":"Determination of modern reliability indicators of relay protection and automation devices","authors":"A. Vinogradov, A. Lansberg, Y. D. Volchkov, A. Vinogradova","doi":"10.30724/1998-9903-2023-25-2-58-70","DOIUrl":"https://doi.org/10.30724/1998-9903-2023-25-2-58-70","url":null,"abstract":"   RELEVANCE. The reliability of power supply to consumers depends on the reliability of all elements of the power supply system, including relay protection and automation devices (RZiA). Knowing the current values of the reliability indicators of various devices makes it possible to take them into account when designing RPA, choosing more reliable devices, identifying shortcomings in RPA and performing work to eliminate them.   THE PURPOSE. Due to the lack of open data on the current values of reliability indicators of relay protection and automation devices (RPA) of electric networks of 10-110 kV, the question of their determination on the example of power systems of various regions is relevant.   METHODS. The authors present and analyze official statistical data on the number of emergency failures, false and correct actuations of relay protection and automation devices in the electric grid organization - branch of PJSC «Rosseti Center» – «Ore lenergo» for 2013-2021.   RESULTS. In the course of the study, numerical values of the following reliability indicators of relay protection and automation devices were determined: the failure rate and the frequency of excessive triggering. Relayprotection and automation devices, for which reliability indicators have been determined, are used to implement arc protection, maximum current protection, automatic re-activation, differential protection of buses and transformer, transverse directional differential protection, gas protection of transformer, differential-phase protection.   CONCLUSION. The values of the failure flow for different types of relays and microprocessor devices of the RPA are established, for example, for an electromechanical relay of the DZT-11 type used to implement differential protection of transformers with a higher voltage of 110 kV, the failure flow is 0,2 year-1/100 pcs., and the frequency of excessive triggering is 22,22 year-1/100 pcs. Conclusions are drawn about the need for measures to regulate the settings and maintenance of devices of various types.","PeriodicalId":222237,"journal":{"name":"Power engineering: research, equipment, technology","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121716608","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}
引用次数: 0
Study of the temperature conditions of power transformers elements for example transformers at substation «Kabun-І» (Syrian Arab Republic) 电力变压器元件温度条件的研究,例如«Kabun-І»变电站变压器(阿拉伯叙利亚共和国)
Power engineering: research, equipment, technology Pub Date : 2023-06-08 DOI: 10.30724/1998-9903-2023-25-2-84-96
E. Gracheva, A. Alzakkar, S. Valtchev
{"title":"Study of the temperature conditions of power transformers elements for example transformers at substation «Kabun-І» (Syrian Arab Republic)","authors":"E. Gracheva, A. Alzakkar, S. Valtchev","doi":"10.30724/1998-9903-2023-25-2-84-96","DOIUrl":"https://doi.org/10.30724/1998-9903-2023-25-2-84-96","url":null,"abstract":"   RELEVANCE. Any device loses its performance over time, Power transformers too. The problems of overheating and insulation are the main influencing factors to the operation status of power transformers. Thus, the study is of high relevance and applied demand, because the heating ofpower transformer elements, especially in the territory of the Syrian Arab Republic, can reach 46 °C. Monitoring the state ofpower transformers is of decisive importance in the study of reliability and safety indicators in the power system. Thermal stress is one of the main parameters to be controlled. Sharp fluctuations in the temperature of the transformer winding, oil, insulating medium, etc. affect the operating conditions, sen’ice life and safety of transformers.   PURPUSE. Determination of the type of functional dependences of the heating temperature of windings and oil ofpower transformers on their loading. METHODS. Determination of the type of functional dependences of the change in the temperature of the windings and oil of power transformers using the methods of statistical data processing, approximating functions and assessing their reliability.   RESULTS. Approximating functions of the main temperature parameters ofpower transformer elements have been developed - a function of the temperature of the average overheating of the winding above the oil temperature; function of the temperature of the average overheating of the oil above the temperature of the cooling air; oil superheat temperature function above the cooling air temperature; superheat function of the hottest spot above the cooling air temperature. The coefficients of determination of the obtained temperature functions of the average overheating of the winding and the average approximation error are determined. As a result of the research, it was found that the polynomial function is the most reliable. The developed dependencies can be used for practical application to assess and analyze the heating temperature of oil and transformer windings with a known load, as well as to control the operating modes of electrical equipment and consumers of electrical energy in power supply systems.","PeriodicalId":222237,"journal":{"name":"Power engineering: research, equipment, technology","volume":"115 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127446215","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}
引用次数: 0
Operational determination of the point of a short circuit in power lines 电力线短路点的操作测定
Power engineering: research, equipment, technology Pub Date : 2023-06-08 DOI: 10.30724/1998-9903-2023-25-2-71-83
K. Suslov, N. Solonina, Z. Solonina, A. Akhmetshin
{"title":"Operational determination of the point of a short circuit in power lines","authors":"K. Suslov, N. Solonina, Z. Solonina, A. Akhmetshin","doi":"10.30724/1998-9903-2023-25-2-71-83","DOIUrl":"https://doi.org/10.30724/1998-9903-2023-25-2-71-83","url":null,"abstract":"   RELEVANCE. An urgent task is to improve the reliability and quality of power supply. Very often, failures in operation are caused by damage to overhead and cable lines. Traditionally, a fairly large number of violations occur in the share of electrical distribution networks. For the reliable functioning of power systems and uninterrupted power supply to consumers, it is necessary to identify and eliminate faults in a short time to minimize damage. Thus, a method for efficient, accurate and reliable fault location is needed for both utility companies and consumers. To solve this problem, it is necessary to quickly obtain information about the state of the distribution eclectic network.   THE PURPOSE. Reducing the time to search for a fault location in electrical networks, reducing damage from downtime for undersupply of electricity by analyzing existing methods for determining the location of faults on a power transmission line and developing a method for its prompt detection in electrical networks.   METHODS. The basis of this method is a preliminary theoretical calculation of short-circuit currents in various sections of a power line. Based on the values obtained as a result of the calculation, the measured values of the short-circuit currents are compared with these values, on the basis of which the location of the line damage is determined. An algorithm for searching the left and right boundaries of the short-circuit current value in an ordered array of statistical data has been developed.   RESULTS. A method for quickly determining the location of a short circuit is proposed, which is based on the use of a data array of theoretically calculated short circuit currents. The presented algorithm is able to accurately determine the coordinates of the short circuit in electrical networks.   CONCLUSION. The proposed method for determining the location of damage to the power line allows you to increase the efficiency of determining the point of a short circuit and thereby reduce the time to eliminate the accident, and therefore, economic losses from undersupply of electricity.The basis of this method is a preliminary theoretical calculation of short-circuit currents in various sections of a power line. Due to the subsequent comparison of the measured values of short-circuit currents with the values of the calculated values, the location of the damage to the power line is determined. The presented algorithm is designed to accurately determine thecoordinates of the short circuit location, which can significantly reduce the search time and improve the accuracy of determining the fault location in the range from 100 to 150 m, regardless of the length of the power line, which significantly reduces the time to search for damage at the same time as solving the problem of reducing downtime , as well as minimizing damage both for guaranteeing suppliers represented by electric grid companies, and for consumers represented by industrial and agricultural ente","PeriodicalId":222237,"journal":{"name":"Power engineering: research, equipment, technology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130669189","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}
引用次数: 1
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