scholarly journals Methodology of online assessment of technical state of transformer substation 35/6 (10) kV by express analysis coefficient

2021 ◽  
Vol 23 (4) ◽  
pp. 14-26
Author(s):  
I. V. Ivshin ◽  
A. R. Galyautdinova ◽  
O. V. Vladimirov ◽  
M. F. Nizamiev ◽  
I. K. Usmanov
Keyword(s):  
Working Condition ◽  
Electrical Energy ◽  
Technical Condition ◽  
Technical State ◽  
Actual State ◽  
Online Assessment ◽  
Main Equipment ◽  
Transformer Substation ◽  
Express Analysis

THE PURPOSE. The purpose of this study is to develop a methodology for determining the coefficient of express analysis of the main equipment of a 35/6 (10) kV transformer substation (TS) to assess its technical condition. A three-level structural complex has been developed for measuring and express-analysis of the technical state of TP. The technical condition of the main equipment of the TP is analyzed according to the selected diagnostic parameters.METHODS. The TP monitoring system makes it possible to assess the performance of its elements online. Express analysis provides remote monitoring, monitoring of the condition of the operating equipment and forecasting changes in the technical condition.RESULTS. The proposed method for determining the coefficient of express analysis allows online monitoring of changes in monitored parameters, reducing the recovery time of failed elements, and maintaining equipment in a working condition. CONCLUSION. The proposed solutions make it possible to move to the organization of maintenance and repair of the main power and electrical equipment of the transformer substation according to the actual state, as well as to improve the reliability and quality of the transmission of electrical energy to consumers.

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.

scholarly journals Risk-Based Approach in Assessing the Technical Condition of Foundations of Bridge Structures

2021 ◽  
Vol 18 (6) ◽  
pp. 64-73
Author(s):  
E. V. Kaimov
Keyword(s):  
Mathematical Model ◽  
Technical Condition ◽  
Technical State ◽  
Probabilistic Methods ◽  
Transport Infrastructure ◽  
Practical Significance ◽  
Structural Elements ◽  
Functional Quality ◽  
Bridge Structures

The objective of this article is to consider the use of predictive mathematical models for assessing risks associated with a critical loss of values of functional quality of bearing structural elements (foundations) of bridge structures using methods of probabilistic analysis and forecasting the risks of reducing of values of indicators of the technical state of structural elements.The research results in development of an algorithm and a mathematical model that characterise the features of the process of reducing of values of indicators of the technical condition of load-bearing structures during the service life cycle. The results of assessing the loss of functional quality of foundations obtained using this model are presented.The practical significance of the study relates to the possibility and expediency of using probabilistic methods for predictive assessment of the technical state of loadbearing structures. With the help of an appropriate mathematical model, it becomes possible to proceed with design rationale of indicators of functional quality of foundations of bridge structures.The need to improve regulatory provisions for design and forecasting of indicators of the technical condition of transport infrastructure objects is substantiated.

SISTEM AUTOMATIC SWITCH REDUNDANT UPS UNTUK BEBAN ESSENSIAL

2019 ◽  
Vol 5 (1) ◽  
pp. 35-45
Author(s):  
Markus Dwiyanto Tobi ◽  
Alimuddin Mappa
Keyword(s):  
Power Supply ◽  
Working Condition ◽  
Control Circuit ◽  
Energy Sources ◽  
Main Equipment ◽  
Telecommunication Equipment ◽  
Input Condition ◽  
Research Designs ◽  
Switch Circuit

The role of the power supply device is to produce, process and distribute energy sources. Telecommunication equipment can only operate if it has continuous supply. Therefore, to maintain the continuity of the supply, a UPS (Uninterruptable Power Supply) device system is needed so that the supply to the Essential Load device will remain available so that continuity will be maintained. This research designs and proposes how a series of automatic redundant switch systems on UPS to ensure the availability of power supply for the main equipment of telecommunications systems. The Auto switch circuit is designed to have 3 (three) working stages which will trigger the relay driver as control circuit, namely the normal working condition of the contactor input K1 is present, the input condition is zero (lost), and the input condition is present. This system can automatically supply power to telecommunications equipment.

Reduction of the Low Voltage Substation Constraints by Inserting Photovoltaic Systems in Underserved Areas

2019 ◽  
Vol 12 (2) ◽  
pp. 105-112
Author(s):  
Benbouza Naima ◽  
Benfarhi Louiza ◽  
Azoui Boubekeur
Keyword(s):  
Low Voltage ◽  
Voltage Drop ◽  
Electrical Energy ◽  
Utilization Rate ◽  
Photovoltaic Systems ◽  
Voltage Distribution ◽  
Medium Voltage ◽  
Pv Systems ◽  
Transformer Substation ◽  
Load Pattern

Background: The improvement of the voltage in power lines and the respect of the low voltage distribution transformer substations constraints (Transformer utilization rate and Voltage drop) are possible by several means: reinforcement of conductor sections, installation of new MV / LV substations (Medium Voltage (MV), Low Voltage (LV)), etc. Methods: Connection of mini-photovoltaic systems (PV) to the network, or to consumers in underserved areas, is a well-adopted solution to solve the problem of voltage drop and lighten the substation transformer, and at the same time provide clean electrical energy. PV systems can therefore contribute to this solution since they produce energy at the deficit site. Results: This paper presents the improvement of transformer substation constraints, supplying an end of low voltage electrical line, by inserting photovoltaic systems at underserved subscribers. Conclusion: This study is applied to a typical load pattern, specified to the consumers region.

scholarly journals Factors Influencing Students’ Behavior and Attitude Towards Online Education during COVID-19

2021 ◽  
Vol 13 (13) ◽  
pp. 7469
Author(s):  
Gratiela Dana Boca
Keyword(s):  
Online Education ◽  
Online Courses ◽  
Individual Characteristics ◽  
Online Assessment ◽  
Teaching Skills ◽  
Educational Activities ◽  
Online Platforms ◽  
Factors Influencing ◽  
The World

Universities around the world have faced a new pandemic, forcing the closure of campuses that are now conducting educational activities on online platforms. The paper presents a survey about students behavior and attitudes towards online education in the pandemic period from the Technical University of Cluj Napoca, Romania. A group of 300 students participated. The questionnaire was structured in four parts to determine student’s individual characteristics, student’s needs, students’ knowledge in using virtual platforms and students’ quality preferences for online education. The students said that online education in a pandemic situation is beneficial for 78% of them. A total of 41.7% percent of students appreciated the teachers’ teaching skills and the quality of online courses since the beginning of the pandemic, and 18.7% percent of the students appreciated the additional online materials for study to support their education. However, students found online education stressful, but preferred online assessment for evaluation. This pandemic has led to the new stage of Education 4.0, online education, and the need to harmonize methods of education with the requirements of new generations.

scholarly journals Analysis of vibrodiagnostics methods in the technical state study of designed multimedia mobile scenes

2019 ◽  
Vol 302 ◽  
pp. 01011
Author(s):  
Marcin Łukasiewicz ◽  
Michał Liss ◽  
Natalia Dluhunovych
Keyword(s):  
Modal Analysis ◽  
Diagnostic Tests ◽  
Research Process ◽  
Technical Condition ◽  
Technical State ◽  
Normal Operation ◽  
Design Stage ◽  
Analysis Methods ◽  
State Study ◽  
Diagnostic Research

The paper presents the possibilities of using vibroacoustic methods in the study of the technical condition of designed multimedia mobile scenes. In particular, the possibility of implementing modal analysis methods in modelling and diagnostic research process has been presented. The use of virtual methods enables diagnostic tests both at the design stage and at the stage of normal operation, whereas modal methods help to explain the nature of the work of the element under investigation.

Examination of State of the Cable Insulation by the Return Voltage

2018 ◽  
Vol 19 (6) ◽  
Author(s):  
Dmitry Semenov ◽  
Anna Sidorova ◽  
Pavel Romanov ◽  
Aleksey Kuvshinov
Keyword(s):  
Residual Life ◽  
Technical Condition ◽  
Actual State ◽  
Power Cables ◽  
Insulation Resistance ◽  
Cable Lines ◽  
P Factor ◽  
Paper Insulation ◽  
New System

Abstract The relevance of the study is conditioned by the need to determine the state and residual life duration of high-voltage cable lines to identify faulty and maintainable cables. The aim of the article is to determine a reliable scientifically grounded criterion for assessment of insulation characteristics of the cables in use and to perform a comparative analysis of the results obtained by the traditional method of diagnosing insulation with the results of a new method of assessment by the return voltage. In this regard, the article deals with the issues related to the testing of cables having oil-impregnated paper insulation, as well as with the issue of switching from planned replacement of cables to assessment of their actual state and period of residual life. The authors propose to use the method of examining the cables by the return voltage using the device for testing electrical insulation “UDEI-1” developed at the department of Electrification and Automation of the Nizhny Novgorod State University of Engineering and Economics. The article presents the results of measuring the return voltage of three cables that operated under different conditions. The cables had different technical state. The analysis of the estimation of the residual life of cables by the return voltage was carried out using such criteria as the PIRV polarization index, the LIRV electrical conductivity index, and the P-factor. The P-factor is the physical criterion demonstrating the aging of paper-oil insulation by the shape of the return voltage curve. It represents such characteristics of insulation aging as moistening. To compare the results of testing the cables by the return voltage with the conventional methods of diagnostics and to determine the actual technical condition of power cables, the authors applied the method of spatiotemporal reflectometry and the method of measuring insulation resistance with the determination of such indicators of state as insulation resistance normalized per one kilometer, absorption coefficient, and polarization index. The results of this article confirm that the return voltage gives a qualitative assessment of the state and degree of aging of cables with impregnated paper insulation. The authors proposed a new system for evaluation of cable condition by weighting coefficients. In this approach, the determination of residual life of cables with impregnated paper insulation is based on the values of the return voltage. Application of the new system gives opportunity to improve reliability of the power lines. Recommendations for the further operation of the studied cables are given. The materials of the article are of practical value for carrying out complex assessment of the technical condition of power cables by the return voltage and can be useful for drawing up a schedule for replacement or repair of cable lines depending on their actual state.

scholarly journals Discussion on the Application of New Photovoltaic Energy in Building Electrical Energy Saving

2020 ◽  
Vol 9 (1) ◽  
pp. 1
Author(s):  
Qian Yang
Keyword(s):  
Energy Conservation ◽  
Construction Industry ◽  
Construction Projects ◽  
Negative Impact ◽  
Rapid Development ◽  
Social Economy ◽  
Green Building ◽  
Electrical Energy ◽  
New Energy

<p>With the rapid development of social economy, the demand for new energy is also increasing, and then the problem of large consumption also has a negative impact on the development of the construction industry. Under the concept of green building, the design and construction units pay more attention to energy conservation and environmental protection, so they actively use photovoltaic new energy in the field of electrical energy conservation of construction projects, so as to improve people's quality of life. Starting from the principles and characteristics of building electrical energy conservation, this paper discusses the methods of building electrical energy conservation, and analyzes how to use photovoltaic new energy in the field of building electrical energy conservation, hoping to better practice the concept of energy conservation.</p>

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