scholarly journals Logical-probabilistic assessment of the occurrence of destruction during intersystem interactions in the electrical system of the seaport

2021 ◽  
Vol 2061 (1) ◽  
pp. 012131
Author(s):  
O N Litskevich ◽  
A P Litskevich
Keyword(s):  
Technological Process ◽  
Power Supply ◽  
Physical Nature ◽  
Electrical Equipment ◽  
Technical Condition ◽  
Power Line ◽  
Electrical System ◽  
Cable Line ◽  
Composite Object ◽  
Electrical Wear

Abstract This article solves the problem of a quantitative assessment of the occurrence of destruction in the intersystem interactions of the transport system and the electrical system of the seaport, in the conditions of the technological process in the seaport, which indicates its significant impact on the electrical system, as a result of which the reliability of the berthing power line is significantly reduced. The intersystem interactions that occur during the implementation of the technological process, as experience shows, are the causes of critical situations that occur at the border of areas of different physical nature, and the consequences are recorded, in the case under consideration, in the electrical system. A mathematical model describing intersystem destruction in quantitative form is presented in this paper using a logical-probabilistic model that reflects internal and external relationships. In the object under study, the destructive cause (collision) and the consequence (accumulation of electrical damage in the insulation of the cable line) are in the same object (the mooring power supply unit), and this is limited to the effects of intersystem destruction. In such a statement, the object of power supply of the technological process and equipment is considered as a composite object containing a cable line and an electric contact column. The problem being formulated is an important and relevant scientific task, which includes not only the question of identifying the causes of increased electrical wear of the power line, but also the development of methods for obtaining quantitative results, and in practical terms also involves the diagnosis of the technical condition of electrical equipment and timely preventive maintenance.

scholarly journals Substantiation of the choice of the replacement scheme of line for mathematical modeling of 20 kV power supplies.

2021 ◽  
Vol 24 (1) ◽  
pp. 69-72
Author(s):  
SKRYPNYK S. ◽  
Keyword(s):  
Power Systems ◽  
Transmission Lines ◽  
Power Supply ◽  
Electrical Equipment ◽  
Distribution Networks ◽  
Power Line ◽  
Power Lines ◽  
Electrical Networks ◽  
Overhead Lines ◽  
Replacement Scheme

In the current global economic crisis and acute shortage of energy resources, increasing importance is attached to energy saving measures, economical and careful consumption of raw materials, materials, electricity and heat, environmental safety of industrial production. During the reconstruction of existing power supply systems of industrial enterprises, modern progressive solutions should be considered and implemented, morally and physically obsolete electrical equipment should be replaced, namely the introduction of new electrical equipment for transition from 6/10 kV to 20 kV in Ukrainian power systems. It is also necessary to pay attention to the improvement of power supply circuits and distribution networks, the implementation of complex automation of complex technological processes, rational compensation of reactive power at all levels of power supply systems. In the power system, the main transport link is the power line. Power lines (transmission lines) are long conductors suspended at a safe distance from the ground overhead lines (overhead lines) or cable lines (overhead lines) in which conductors are insulated from each other and from the environment and protected by insulation and armor electricity. Power lines are the most massive elements of the power supply system, they connect the individual nodes of its circuit. Longitudinal and transverse parameters are distinguished in alternative schemes. The load current flows through the longitudinal parameters, voltage is applied to the transverse ones. The replacement circuit of the electrical network consists of replacement circuits of the following elements: power lines, transformers, reactors, capacitors, loads, power sources. Calculating the steady-state modes of power systems, the substitution schemes of the elements are given in a single-line design, because the parameters of all phases are symmetrical. In local and local electrical networks with a relatively short length and low rated voltage, the conduction currents are small compared to load currents. Therefore, in typical electrical calculations of these networks, the capacitive conductivity of the lines is not taken into account. However, for these networks, the accounting of capacitive conductivities is necessary when considering some modes, the existence of which in itself is due only to the presence of capacitive conductivities. For example, the mode of single-phase ground fault in a network with isolated or compensated neutral or analysis of the modes of operation of neutrals of electrical networks of different voltage classes cannot be performed without taking into account the capacitive conductivity of these networks. When switching the power system of Ukraine to the nominal voltage of 20 kV, it should be taken into account that the transmission line will be replaced in the sections of both the overhead power line and cable power line, namely 35, 10, 6 kV. The replacement scheme must describe all the characteristics and properties of the elements of cable and overhead lines in accordance with real conditions. Thus, it is not expedient to use simplified substitution circuits that neglect energy parameters and properties of conductors to study the parameters of transmission lines. The use of a complete "P" -shaped scheme for the analysis of the parameters of transmission lines and transmission lines for a voltage of 20 kV is the basis of mathematical modeling of the transmission system in the distribution networks of our country.

scholarly journals Modeling the reliability of electrical power lines of the seaport in conditions forced electricity consumption

2021 ◽  
pp. 121-127
Author(s):  
А.П. Лицкевич ◽  
С.А. Лицкевич ◽  
О.Н. Лицкевич
Keyword(s):  
Mathematical Model ◽  
Technological Process ◽  
Operating Time ◽  
Electricity Consumption ◽  
Arbitrary Point ◽  
Power Line ◽  
Operating Conditions ◽  
Power Lines ◽  
Power Cable ◽  
Cable Line

В работе рассматривается задача оценки времени наработки силовой кабельной линии морского порта, с учетом форсирования технологического процесса в морском порту (погрузочно-разгрузочных работ) и, в связи с этим, повышения величины токовой нагрузки в силовой линии, превышающей допустимый предел, что ведет к повреждению линии. Для оценки влияния форсированного технологического процесса, на наработку силовых линий, вводятся основные факторы влияния: время длительности форсированного режима; величина тока в линии; температура окружающей среды. С их помощью вводится функция сокращающегося временного ресурса наработки силовой линии, которая отображает повреждения в силовой линии. Общая математическая модель наработки силовой кабельной линии включает повреждения в кабельной линии как основной фактор. Решение задач осуществляется с помощь разработанных программных средств и применения нечеткой математики, в среде Mathcad. Представленная математическая модель позволяет количественно оценить время наработки при использовании форсированных технологических режимов и повышенного потребления энергии, а также оценить степень снижения времени наработки, в результате суммарного действия повреждающих факторов, для произвольного момента времени в условиях эксплуатации. The paper considers the problem of estimating the operating time of the power, cable line of the seaport, taking into account the acceleration of the technological process in the seaport (loading and unloading operations) and, in this regard, the increase in the current load in the power line exceeding the permissible limit, which leads to damage lines. To assess the influence of the forced technological process on the operating time of the power lines, the main factors of influence are introduced: the duration of the forced mode; line current value; ambient temperature. With their help, the function of reducing the time resource of the operating time of the power line is introduced, which displays the damage in the power line). The general mathematical model of the power cable line operating time includes damage in the cable line as the main factor. The solution of problems is carried out with the help of the developed software and the use of fuzzy mathematics, in the Mathcad environment. The presented mathematical model makes it possible to quantitatively evaluate the operating time when using forced technological modes and increased energy consumption, as well as to assess the degree of reduction in the operating time, as a result of the total action of damaging factors, for an arbitrary point in time under operating conditions.

scholarly journals Determination of the technical condition of electrical equipment in power supply systems

2021 ◽  
Vol 939 (1) ◽  
pp. 012014
Author(s):  
A Rakhmatov ◽  
N Rajabov ◽  
Kh Yakubova
Keyword(s):  
Power Supply ◽  
Power Supply System ◽  
Electrical Energy ◽  
Electrical Equipment ◽  
Technical Condition ◽  
Supply System ◽  
Operating Modes ◽  
Quality Of Electrical Energy ◽  
Supply Systems

Abstract This article describes the methods and means for determining the technical condition of electrical equipment in power supply systems, particularly in transformer substations. There are many ways to determine the technical condition of electrical equipment. However, their implementation requires complex and additional equipment and devices. In addition, these tests must be carried out when the power supply system is off. This will lead to a decrease in the quality of electrical energy. Determination of the technical condition of electrical equipment using thermal imagers is performed under the voltage and in operating modes, the measurement process does not affect the parameters of the power supply system. The results of research in energy enterprises of the Syrdarya region are presented.

scholarly journals Methodology for managing equipment repairs in oilfield electrical networks

2020 ◽  
pp. 139-155
Author(s):  
Vladimir Levin ◽  
◽  
Nikolay Guzhov ◽  
Natalya Chernenko ◽  
Ammar Yahya ◽  
...  
Keyword(s):  
Power Supply ◽  
Risk Function ◽  
Electrical Equipment ◽  
Distribution Networks ◽  
Condition Index ◽  
Technical Condition ◽  
Technical Diagnostics ◽  
Electrical Networks ◽  
Destructive Testing ◽  
Risk Event

An innovative methodology for managing repairs in distribution networks and power supply systems for oilfield facilities is proposed in this paper. The methodology makes it possible to select optimal solutions in accordance with the priority management goal by formalizing a risk-based model for planning maintenance and repair (M&R) of electrical equipment with a "condition-based maintenance" strategy. One of the main options in the complex of M&R management tasks is an adaptive model of the technological map for the repairs of power facilities, formed in compliance with a number of key principles. The developed model allows you to optimize the volume and complexity of repairs of electrical equipment of a certain type based on the minimum composition of technological operations necessary to eliminate the identified defects. Detection of defects in electrical equipment is achieved by using methods of technical diagnostics and non-destructive testing. In this case, each of the defects is recorded in the defect statement for the object, with the determination of the degree of criticality and fixing a specific type of corrective action. Optimal prioritization of electrical equipment repairs is performed in accordance with the minimum risk function under current restrictions on reliability (an equipment technical condition index) and available resources (total maintenance costs). The originality of the implementation of a key risk event – a power supply failure of an oilfield facility provides calculating the probability and severity of the consequences of an electrical equipment failure taking into account its technical condition and features of the power supply scheme. The given example illustrates the effectiveness of the proposed approach and emphasizes the validity of optimal decisions. The key components of the developed methodology have found practical application in the conditions of real operation of the equipment of oilfield facilities.

ASSESSMENT OF THE CONDITION OF HIGH-VOLTAGE ELECTRICAL EQUIPMENT OF THE MULTI-LEVEL POWER SUPPLY SYSTEM OF THE SHOPS OF THE PRODUCTION METALLURGICAL LINE

2021 ◽  
Vol 3 (1) ◽  
pp. 054-057
Author(s):  
Yu. N. KONDRASHOVA ◽  
◽  
I. V. NOVIKOV ◽  
A. M. MARKIN ◽  
◽  
...  
Keyword(s):  
High Voltage ◽  
Power Supply ◽  
Power Supply System ◽  
Electrical Equipment ◽  
Technical Condition ◽  
Supply System ◽  
Power Lines ◽  
Reliability Indicators ◽  
Multi Level ◽  
Cable Lines

The paper analyzes damage along overhead and cable power lines. The calculation of the main indicators of reliability is carried out to predict the value of the actual resource of the main high-voltage electrical equipment for the shops of the production metallurgical line. The calculations were performed for the existing circuit using the software package [1]. The performed analysis of the obtained results of the developed algorithm and methods for calculating reliability indicators made it possible to assess the technical condition of overhead and cable lines subject to intense aging in terms of voltage levels and to estimate the number of outages at nodal substations.

The material and technical condition of the outpatient polyclinic in Russian Federation: analysis of the current situation

2022 ◽  
pp. 8-17
Author(s):  
Aleksey Viktorovich Smyshlyaev ◽  
Keyword(s):  
Water Supply ◽  
Russian Federation ◽  
Power Supply ◽  
Technical Condition ◽  
Hot Water ◽  
Positive Trend ◽  
Major Overhaul ◽  
Central Heating ◽  
The Russian Federation ◽  
Hot Water Supply

The article analyzes the main indicators of the technical condition of buildings of outpatient medical organizations (units) in the Russian Federation for the period 2012–2019. The number of outpatient medical organizations (units) in emergency condition and requiring demolition tended to decrease from 215 units to 96 for the period from 2012 to 2017 in the Russian Federation. The number of units requiring reconstruction in the Russian Federation declined from 511 to 179 for 2012–2019. The number of units requiring major overhaul in the Russian Federation went down from 4,347 to 2,378 for the period from 2012 to 2018, and in 2019 rose sharply to 4,113. The number of units located in adapted premises increased from 6,723 to 8,126 for 2014–2019 in the Russian Federation. The number of units located in the rented area in the Russian Federation decreased from 1,443 to 1,414 for 2014–2019. The number of units with central water supply went up from 17559 to 19440 for 2012–2019 in the Russian Federation. The number of units with hot water supply in the Russian Federation increased from 13,012 to 15,124 for 2012–2019. The number of units with central heating rose from 16,893 to 17,546 for 2012–2019 in the Russian Federation. The number of units with a central sewer went up from 17,111 to 18,969 in the Russian Federation for 2012–2019. The number of units with telephone communication increased from 17,806 to 19,266 for 2012–2019 in the Russian Federation. The number of units with autonomous power supply rose from 941 to 1,227 in the Russian Federation for 2012–2019. The total number of outpatient medical organizations (units) in the study period increased by 7.9 %. The number of buildings requiring renovation and modernization between 2012 and 2018 tended to decrease. Not all indicators have a positive trend. Health care modernization is not completely structural.

scholarly journals Calculation of the economy of electric energy in industrial electrical supply systems

2020 ◽  
Vol 22 (2) ◽  
pp. 65-74
Author(s):  
E. I. Gracheva ◽  
A. N. Gorlov ◽  
Z. M. Shakurova
Keyword(s):  
Power Supply ◽  
Energy Savings ◽  
Reactive Power ◽  
Electric Energy ◽  
Electrical Equipment ◽  
Total Power ◽  
Load Factor ◽  
Advantages And Disadvantages ◽  
Industrial Enterprises ◽  
Supply Systems

The article examines the main features of the layout of electrical equipment for shop networks of internal power supply with the definition of indicators for a group of shop customers connected to a single power center, affecting the choice of the structure of schemes for shop network sites. The parameters characterizing the circuit topology are revealed. A study is presented of the influence of the load factor of workshop transformers on their reactive power factor, it is proved by calculation by technical and economic criteria the feasibility of replacing a workshop transformer with two with a lower total power. The calculation of energy savings in the in-plant power supply systems. The type of dependences tgφ of transformers ТМ and ТСЗ with various rated powers in the function of loading transformers is established. The most significant factors of the growth of idle power losses during operation are presented. With determination of losses of active and reactive power and electricity in transformers and losses of active power in a high voltage distribution network A feasibility study was carried out on the options for internal power supply schemes with two transformers of lower power installed instead of one, and the feasibility of such a replacement to increase the efficiency of the equipment was proved and the estimated payback period for the investment capital was determined. A comparative analysis of the studied power supply schemes of industrial enterprises with the identification of their advantages and disadvantages.

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