scholarly journals The study of health and quality of operation of the transformer equipment electrical systems

2020 ◽  
Vol 22 (3) ◽  
pp. 23-35
Author(s):  
A. R. Denisova ◽  
D. P. Spasov ◽  
A. R. Galyautdinova ◽  
V. R. Ivanova
Keyword(s):  
Early Stage ◽  
Electrical Equipment ◽  
Technical Condition ◽  
Measuring System ◽  
Necessary Condition ◽  
Qr Code ◽  
Electric Networks ◽  
Electrical Systems ◽  
Transformer Equipment

Detection of defects at an early stage of their occurrence, especially for power transformers that have worked out the standard term, is an acute problem. This article discusses the possibility of using the system of monitoring, control and diagnosis of transformer equipment (SMUID) electrical systems in conjunction with the automated control system of electrical equipment (ASU ETO) and automated information-measuring system of commercial electricity metering (AIIS KUE) with the use of QR-code, as well as using TeamViewer for the operational elimination of accidents and identify abnormal operation of transformer equipment. Transformer monitoring system is designed for monitoring isolation, recording and analysis of partial discharges, monitoring of technical condition ensuring maximum fault-free service life of transformers. In addition, the introduction of automated diagnostics and electrical equipment is a necessary condition for the introduction of SmartGrid technology in industrial electric networks, contributes to the reduction of capital investments in the renewal of the equipment fleet. The methods currently used do not detect dangerous insulation degradation, are not sensitive to its aging, and in some cases mistakenly assess the isolation condition. The work analyses the operability and quality of the systems under consideration, shows the hierarchical structure of SMUID. By applying the proposed idea with the QR-code, it is possible to speed up the process of searching for information about the current technical state of electrical equipment.

scholarly journals AUTOMATION OF THE HEAT STATE ANALYSIS PROCESS HIGH-VOLTAGE CURRENT TRANSFORMERS

2019 ◽  
pp. 96-110
Author(s):  
V. M. Kutin ◽  
M. V. Nikitchuk ◽  
V. M. Svitko ◽  
O. O. Shpachuk
Keyword(s):  
Expert Knowledge ◽  
Thermal State ◽  
Statistical Processing ◽  
Electrical Equipment ◽  
Technical Condition ◽  
Mobile Systems ◽  
Electric Networks ◽  
Structural Element ◽  
Operating Life ◽  
Current Transformers

Thermographic control of electrical equipment allows you to draw preliminary conclusions about the technical condition of insulation, contact joints, windings, structural elements and cooling systems of electrical equipment of voltage classes 0.4 ÷ 750 kV. However, it should be borne in mind that the results of temperature measurement and assessment of the thermal state of electrical equipment are influenced by such factors as: environmental conditions, qualifications of personnel performing thermographic control and data interpretation, the need to improve regulatory documents for assessing the thermal state of electrical equipment and develop unified algorithms analysis of the results of thermographic examinations and gradation of the development of defects in electrical equipment. Modern research in the field of thermographic control of electrical equipment is developing in several directions, namely: the use of automated (stationary or mobile) systems for collecting thermographic data; development of algorithms for processing thermal images that reduce the influence of extraneous noise on the values of the measured temperatures, select the image of the object being examined, select the optimal level of contrast of the thermal image to detect thermal anomalies; using statistical processing of thermal fields of thermal monitoring objects and making decisions about the thermal state of equipment using neural networks, machine learning and expert knowledge. Automation of the analysis of thermographic control data is an urgent scientific and practical task, the solution of which will improve the quality of maintenance, repairs, extension of the operating life and operational management of electrical equipment in conditions of a significant level of aging of the main production assets of electric companies and change of generations of staff. Measuring current transformers of voltage classes 330 ÷ 750 kV are critical elements in the distribution schemes of electric power and in electric networks, and their technical condition directly affects the reliability of electric networks and power supply to consumers. The paper considers the reasons for the development of defects in current transformers of voltage classes 330 ÷ 750 kV, and also proposes relationships to take into account the influence of the air flow rate and the actual value of the emissivity of the structural element of the current transformers, as well as elements of the algorithms for analyzing data from thermal imaging surveys to reduce the influence of environmental factors and qualification level of the personnel performing the analysis, diagnostic results.

The most common violations of regulatory indicators of the quality of electric energy in electric networks

2021 ◽  
pp. 44-49
Author(s):  
A. G. Soshinov ◽  
T. H. Aisin
Keyword(s):  
Quality Indicators ◽  
Electric Energy ◽  
Electrical Equipment ◽  
Operating Conditions ◽  
Regulatory Requirements ◽  
Electric Networks ◽  
High Quality ◽  
The Asymmetry

Work on ensuring the quality of electric energy in accordance with the requirements of GOST 32144-2013 is currently relevant and requires prompt and high-quality solutions. The article lists the main consumers of electric energy that negatively affect its quality, provides the results of measurements of electric energy quality indicators and the most common violations of regulatory requirements, analyzes the influence of voltage asymmetry on the operating conditions of electrical equipment. The basic formulas for calculating the asymmetry coefficients and ways to reduce the voltage asymmetry are proposed.

Maintenance of Power Equipment System Based on the Methods of Diagnosis and Control of Technical Condition

2018 ◽  
pp. 421-448 ◽  
Author(s):  
Dmitry Strebkov ◽  
Alexey Nekrasov ◽  
Anton Nekrasov
Keyword(s):  
Operating Time ◽  
Electrical Equipment ◽  
Technical Condition ◽  
Spare Parts ◽  
Actual Condition ◽  
Power Equipment ◽  
Service Strategy ◽  
Electrical Systems ◽  
Preventive Actions ◽  
Equipment System

Maintenance of the power equipment system is based on the industry standard of averaged volumes of standard maintenance and repair of power equipment, frequency and duration of the preventive measures, the nomenclature and consumption of materials and spare parts to perform operations. One of the more efficient uses of electrical equipment is to improve its maintenance system through the development and implementation of service strategies for the actual condition. The work proved the necessary conditions for the realization of electric service strategy on defining the main diagnostic parameter. The general mathematical model is proposed to implement the service strategy. The model is based on a study of basic parameters using random monotone normal type of process and diagnostic controlled parameter with three discrete product states (working, the state of preventive actions, and failure) and continuous operating time. The results of studies of the new techniques development for improving the operation of electrical systems are presented.

scholarly journals Сhromatographic methods for the study of organic extractants of transformer oil

2021 ◽  
Vol 22 (6) ◽  
pp. 202-210
Author(s):  
Ngoc Dan Vu ◽  
V. F. Novikov
Keyword(s):  
Sample Preparation ◽  
Solid Phase ◽  
Electrical Equipment ◽  
Technical Condition ◽  
Transformer Oil ◽  
Analytical Control ◽  
Phase Extraction ◽  
Quality Of Control ◽  
Sorption Layer

THE PURPOSE. In order to control the technical condition of oil-filled electrical equipment, a number of new analytical methods have recently been created to determine the ultra-low concentrations of impurity compounds in transformer oil. An analysis of the literature data showed that at this stage of the analytical procedure significant errors may occur that worsen the quality of control of the technical condition of oil-filled electrical equipment, and in some cases make its results meaningless. The published literature practically does not discuss the problem of sample preparation of transformer oil, which negatively affects the quality of analytical control, that is, the reliability of the results and, accordingly, the diagnosis of oil-filled electrical equipment. METHODS. The paper discusses a sample preparation system for transformer oil, which is based on various methods for extracting target components from it. The adsorption process is used, the preparation of chemical derivatives, various types of extraction, liquid, gas, solid phase and fluid, as well as using low temperatures, extraction in microwave, magnetic, electromagnetic and centrifugal fields. It is shown that liquid extraction with an organic solvent is widely used from all sample preparation methods, with the help of which furan compounds resulting from the destruction of paper insulation are extracted from transformer oil. The disadvantages of sample preparation using liquid-phase extraction and the possibility of using solid-phase extraction on various adsorbents for this purpose are discussed. RESULTS. The results of an experimental study of the sorption properties of various organic solvents with respect to porous materials differing in the structure of their surface are presented. We used zeolite-bearing rocks of the Tatar-Shatrashansky deposit, synthetic zeolites NaX-13A. Using the ascending variant of liquid column chromatography, the absolute retention values of standard extractants were determined and their dependence on the length of the sorption layer of the porous material was found. CONCLUSIONS. It was shown that the highest retention times for all studied adsorbents are observed for organochlorine extractants, chloroform, carbon tetrachloride, dichloroethane, trichlorethylene. For N. Hexane is a relatively small interaction. Histograms are given of the effect of the retention time of standard sorbates (extractants) on their physicochemical nature.

scholarly journals Development of a fuzzy expert system for power transformer diagnostics

2021 ◽  
Vol 2091 (1) ◽  
pp. 012064
Author(s):  
A P Khlebtsov ◽  
A N Shilin ◽  
A V Rybakov ◽  
A Yu Klyucharev
Keyword(s):  
Fuzzy Logic ◽  
Fuzzy Inference ◽  
Power Transformer ◽  
Early Stage ◽  
Three Dimensional ◽  
Electrical Equipment ◽  
Technical Condition ◽  
Logic Device ◽  
Operational Information ◽  
R Programming

Abstract In this paper, an expert information system for assessing the technical condition of a power transformer is developed. The system will work on the basis of the fuzzy logic device, and provide operational information about the state of the power transformer. The paper uses fuzzy inference algorithms. The R programming language is used to write a program that uses fuzzy logic. We analyzed the data of chromatographic analysis of gases dissolved in oil, as well as the data of thermal imaging images, identifying the most heated points in power transformers. A database of fuzzy logic rules has been formed. Several examples of defuzzification of the results obtained by the center of gravity method are given. As a result of the program, a three-dimensional graph was obtained that characterizes the surface of the fuzzy output. The developed software package allows you to detect defects in working electrical equipment at an early stage of their development, which not only prevents a sudden shutdown of production as a result of an accident, but also significantly reduces the cost of repairing equipment and increases its service life

scholarly journals The system for monitoring and express analysis of main equipment of transformer substation 35/6 (10) kv

2021 ◽  
Vol 134 (1) ◽  
pp. 100-108
Author(s):  
I.G. Ivshin ◽  
◽  
A.R. Galyautdinova ◽  
O.V. Vladimirov ◽  
M.F. Nizamiev ◽  
...  
Keyword(s):  
Online Monitoring ◽  
Early Stage ◽  
Technical Condition ◽  
Actual State ◽  
Main Equipment ◽  
Transformer Substation ◽  
Express Analysis ◽  
Energy Equipment ◽  
Selection Of

There is carried out an analysis and selection of equipment necessary for monitoring and express analysis of the technical condition of a 35/6 (10) kV transformer substation. The authors propose diagnostic parameters for determining the technical condition of equipment and an algorithm for determining the coefficient of express analysis of a transformer substation, which ensures the process of remote monitoring, monitoring the state of operating equipment and predicting changes in the technical condition. The system for monitoring and express analysis of the technical condition of the equipment under development allows online monitoring of changes in the monitored parameters, keeping the equipment in serviceable condition. This monitoring system will make it possible to detect defects at an early stage, to operate the substation's energy equipment more efficiently, and to assess the technical condition of the entire substation in a comprehensive way. The above solutions make it possible to switch to organizing repairs of the substation's main equipment according to the actual state, as well as to increase the reliability and quality of electricity transmission to consumers.

An Analysis of On-Bord High-Voltage Converters of Single-Phase Alternating Current with Increased Miroelectric Power Factor

2020 ◽  
Vol 10 (10) ◽  
pp. 44-51
Author(s):  
Yury Yu. SKOROKHOD ◽  
◽  
Sehgey I. VOL’SKIY ◽  
Keyword(s):  
High Voltage ◽  
Single Phase ◽  
Input Current ◽  
Voltage Converter ◽  
Input Unit ◽  
Power Circuit ◽  
Electrical Systems ◽  
Static Converters ◽  
Technical Requirements

The power circuit arrangements of on-board high-voltage static converters fed from a 3000 V AC single-phase network that in the general case produce multi-channel AC and DC output voltages are considered. The basic technical requirements posed to such converters are formulated. The general structural diagram of high-voltage converters with improved electric power consumption quality is given. Possible power circuit arrangements for the high-voltage converter input unit based on single-phase input current correction devices are considered. A classification and criteria for comparative evaluation of the possible power circuit arrangements of these devices are proposed. The information presented in the article will be of interest for specialists engaged in designing on-board electrical systems involving high-voltage converters that must comply with strict requirements for the quality of consumed single-phase input current.

Managing an Enterprise and Ethical Dilemmas in Accountancy

2014 ◽  
Vol 9 (2) ◽  
pp. 141-151
Author(s):  
Jolanta Wiśniewska
Keyword(s):  
High Risk ◽  
Ethical Dilemmas ◽  
Business Management ◽  
Relevant Information ◽  
Necessary Condition ◽  
Accounting System ◽  
Quality Of Information ◽  
Economic Entity ◽  
A Company

The purpose of this article is to present the correlation between management of an economic entity and the development of ethical accounting dilemmas in the era of high-risk business. In the globalisation era and recurring economic crises, realisation of the objectives of a company takes place under high risk conditions. It is therefore necessary to use a proper management system. The necessary condition for making all decisions is to have relevant information. The value and relevance of these decisions depend on the quality of information which they have been based on. Lack of ethics in accounting has a direct impact on the company's management, which is based on information generated by the accounting system of the company. Ethical dilemmas arising in accounting are also ethical dilemmas arising in the process of business management. 

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