DEVELOPMENT OF THE SOCKET MODULE OF THE ELECTRICAL NETWORK

2021 ◽  
pp. 102-109
Author(s):  
Oleh Zemlianskyi ◽  
◽  
Oleh Miroshnyk ◽  
Tetiana Kostenko ◽  
◽  
...  
Keyword(s):  
Experimental Studies ◽  
Transmission Mechanism ◽  
Practical Significance ◽  
Electrical Network ◽  
Laboratory Research ◽  
Electrical Networks ◽  
Short Circuits ◽  
The Wire ◽  
Abrasive Cutting ◽  
Safe Working

Purpose of the work is to determine the method of emergency de-energization of the object by cutting stranded live wires without the manifestation of emergency modes of electrical networks. Methods. As research methods, a comprehensive approach is used, which includes the analysis of research on emergency de-energization, laboratory research to determine a safe way to cut stranded wires under voltage. Results. De-energizing various objects during rescue operations and firefighting is one of the important tasks that must be performed in order to create safe working conditions for rescuers themselves. It is established that one of the ways by which it is possible to cut live multicore wires without short circuits is the use of abrasive cutting discs made of rotating electrocorundum. The design of a device for trouble-free cutting of live wires, which has a rod, a cutting element, a transmission mechanism and a device for fixing the wire. In the middle of the rod is a transmission mechanism, which is used as a shaft, one end of which is connected to the motor, and the other end through a gearbox, which is fixed to the device for fixing the wire, with a cutting element. In the laboratory conducted experimental studies that showed that the cutting of wires occurs without the manifestation of dangerous factors of electric current – short circuits, sparks, electric arcs. Scientific novelty. Approaches to cutting live multicore wires with corundum disks are substantiated, which excludes the occurrence of emergency modes of electrical networks, in particular short circuits. Practical significance. The obtained results can be used to create tools for safe emergency de-energization, which creates the preconditions for improving the safety of this type of work.

RESEARCH OF THE GEOMETRIC PARAMETERS CHANGING DURING SEPARATION THE HIGH-STRENGTH STONES MONOLITES WITH DIAMOND WIRE MACHINES

2021 ◽  
pp. 7-14
Author(s):  
Sergii Bashynskyi ◽  
◽  
Volodymyr Kotenko ◽  
Maryna Kolodiy ◽  
Viktor Pidvysotskyi ◽  
...  
Keyword(s):  
Experimental Studies ◽  
High Strength ◽  
Geometric Parameters ◽  
Cutting Process ◽  
Practical Significance ◽  
Diamond Wire ◽  
Wire Cutting ◽  
The Wire ◽  
The Relationship ◽  
Free Section

Aim. Developing the theory of diamond wire cutting of crystalline rocks for separating the facing stone blocks from the array by establishing links between individual geometric parameters of the side and the cutting process. Research methods. To achieve this aim were used the next method: analytical studies of the relationship between the geometric parameters of the process of diamond wire cutting, experimental study of the same geometric parameters of the process of diamond wire cutting of high-strength rocks to confirm or refute previously obtained analytical relationships, and statistical processing of data. Results. The length of contact of the diamond wire with the rock is an important criterion for the process of separating the blocks of facing rocks from the array. Given the unavailability of the diamond wire side in the array for direct measurement methods, there is a need for indirect determination of the contact length. It is proposed to use the length of the free section of the wire, as the total length of the wire remains unchanged during the cutting process. It is assumed that the length of the free section can be estimated by the distance between the diamond wire machine installation and the slope of the ledge. Analytical dependences between the specified sizes are considered. The existence of the obtained dependences and the strength of the correlation connection was confirmed by experimental studies in the conditions of the block quarry of the facing stone. Scientific novelty. At first time, the relationship between the distance of the diamond wire machine installation and the side of the diamond wire and the length of the free section of the diamond edging, which allows to control the length of contact of the diamond wire with rock in the cut. The obtained dependence is analyzed and it is concluded that the geometric parameters of the ledge will affect the length of the cut only in the initial stages of separation of the block of natural stone from the array. In the next stages, the length of the free section of the diamond wire depends only on the distance of the location of the diamond wire machine installation and the side of the diamond rope. Practical significance. The value of the optimal initial distance of the diamond wire machine placement to the slope of the ledge is found. The empirical dependence of the length of the free section of the diamond wire on the location of the diamond wire machine is also obtained

Investigation of dependences of selectivity of devices of protection against the value of short circuit currents in electrical networks up to 1000 V

2021 ◽  
pp. 98-100
Author(s):  
I. Radko ◽  
◽  
V. Nalivayko ◽  
O. Okushko ◽  
I. Bolbot ◽  
...  
Keyword(s):  
Single Phase ◽  
Modular Design ◽  
Short Circuit ◽  
Electrical Network ◽  
Electrical Networks ◽  
Circuit Breakers ◽  
New Energy ◽  
Short Circuits ◽  
Pole Scheme ◽  
Short Circuit Currents

According to PUE-2017, each group line must be protected against short circuits. Instant disconnection (cut-off) of the line in the event of short circuits provides an electromagnetic release of the circuit breaker. Reliable tripping is possible if the current of a single-phase short circuit is greater than the instantaneous tripping current. Today on the market are widely available circuit breakers with characteristics "B", "C" and "D", which are characterized by different multiplicities of the cut-off current of the electromagnetic release. Some European companies produce circuit breakers with other characteristics, which greatly expands the possibilities protection of electrical equipment. The difficulty in organizing the selectivity of protection is that the circuit breakers of modular design when switching off short circuits are characterized by the same switching time (not more than 0.05 s). The purpose of the research is to find ways to organize the selectivity of protection in electrical networks with voltage up to 1000 V using reliable values of short-circuit currents. In networks with a voltage of up to 1000 V, the current of a single-phase short circuit can be calculated fairly accurately if the exact values of all sections of the electrical network are known. In practice, it is not always possible to obtain reliable data on the numerical characteristics of the 0.4 kV network to which a new energy facility is connected. Therefore, it is proposed to consider part of the network as an active quadrupole, the characteristics of which are obtained by measurements at the point of connection. For further calculations it is necessary to know the voltage at the clamps of the four-pole scheme and the internal impedance. Based on the theory of four-pole scheme, you can get the original data for calculations without calculating the internal parameters of four-poles scheme. Thus, it is proposed to use a hybrid method for estimating the magnitude of probable short-circuit currents in electrical networks up to 1000 V when designing new energy facilities. Credible values of short-circuit currents will allow to organize selective protection of electric networks.

scholarly journals Effective mode of voltage in the electrical network when powering ships of the technical fleet and floating objects from the shore

2021 ◽  
Vol 2131 (5) ◽  
pp. 052005
Author(s):  
Y Denchik ◽  
D Zubanov ◽  
M Romanov
Keyword(s):  
Power Transmission ◽  
Experimental Studies ◽  
Voltage Regulation ◽  
Electrical Network ◽  
Negative Consequences ◽  
Electrical Networks ◽  
Complex Load ◽  
Floating Crane ◽  
Floating Objects ◽  
The Impact

Abstract The article discusses negative consequences of a decrease in the quality of electrical energy when feeding ship receivers of electricity from coastal sources, a method is proposed to ensure an effective voltage regime in the electrical network when feeding ships of technical fleet and floating objects from the coast. Definition of the equilibrium voltage mode at the “shore-to-ship” power supply scheme is given, the equivalent circuit of supply line (feeder) for the river fleet is developed, significant regulatory effects of the “shore-to-ship” power transmission elements are determined. Experimental studies of static characteristics of floating crane of R-99 project have been carried out. According to the results of the experiment, regulating effects on the voltage of the complex load of 0.4 kV of floating crane were determined. A calculation program for personal electronic computers has been compiled, which provides an assessment of the impact of voltage deviations in electrical networks when regulating the load. The law of voltage regulation in the “shore-to-ship” power transmission is proposed. An experimental verification of effectiveness of proposed regulation law was carried out while ensuring the equilibrium mode.

scholarly journals Solving optimization problems when designing power supply circuits

2019 ◽  
Vol 124 ◽  
pp. 04011 ◽  
Author(s):  
O. V. Shemelova ◽  
E. V. Yakovleva ◽  
T. G. Makuseva ◽  
I. I. Eremina ◽  
O. N. Makusev
Keyword(s):  
Electric Power ◽  
Power Supply ◽  
Optimization Problems ◽  
Cost Minimization ◽  
Mathematical Problem ◽  
Power Lines ◽  
Practical Significance ◽  
Electrical Network ◽  
Power Network ◽  
Electrical Networks

One of the quickly developing trends in the optimization of electric power grids is system development of operation and optimization of branch circuits which are based on linear programming problems. One of its categories is traffic problem. The paper discusses the formulation of various types of transport optimization problems used in the design of the most efficient power supply systems in the real sector of economy. The construction of arithmetic models of problems is carried out. Their optimality criterion is cost minimization for the design of electrical network diagrams consisting of power lines connecting sources and consumers. Examples of designing optimization power layout in mathematical problems considering the transmission capacity of power lines is given. The paper also touches upon a mathematical problem considering possible transit of capacities. The task is to build a mathematical model and solve problems that ensure minimization of process losses and losses of power when designing electrical networks. The results of solving problems are presented in the form of power supply circuits corresponding to the most optimal linking of source and consumer nodes. The work is of a scientific and practical significance as it considers the problem of optimizing economic costs when designing electric power network schemes. Moreover it is based on a qualitatively different level of use of the traffic problem algorithm. The algorithm for solving the minimization problem obtained in this paper allows developing the necessary computing operations as well as quickly obtaining the results of solving the cost optimization problem in the designed electric power network.

scholarly journals RESEARCH OF ADHESIVE AND HEAT-PROTECTIVE PROPERTIES OF RUBBERS BASED ON EPDM WITH ARAMID FILLER

2020 ◽  
pp. 53-61
Author(s):  
Galina Shaydurova ◽  
◽  
Dmitriy Oros ◽  
Natalya Povarnitsyna ◽  
◽  
...  
Keyword(s):  
Adhesive Strength ◽  
Thermophysical Properties ◽  
High Speed ◽  
Phenol Formaldehyde ◽  
Experimental Studies ◽  
Practical Significance ◽  
Laboratory Research ◽  
Formaldehyde Resin ◽  
Ethylene Propylene ◽  
Vulcanized Rubber

Reinforced materials of the "fabric filler-vulcanized rubber" type may be successfully operated under the condition of the specified adhesive strength at the interface of the "substrate-polymer (rubber) "contact. The article presents theoretical infor-mation about ethylene propylene (EDM) and ethylene-propylene-diene (EPDM) synthetic rubbers, known internationally under the brand name EPDM-monomer, arimide fiber and laboratory research methods. The advantages of using EDM and EPDM in the manufacture of heat-protection coatings are; high heat resistance, low density, good compatibility with fillers (mineral and synthetic), compatibility with epoxy and phenol-formaldehyde resins, belong to coking materials. The article also provides the results of experiments and analysis of the data obtained, namely, the adhesive strength and thermal effect of rubbers based on EPDM with an arimide filler of a non-woven structure. The object of the research was modified heat-protective materials based on EPDM, and the subject of the research was selected rubber compounds based on EPDM and synthetic arimide fiber. To as-sess the physicochemical and thermophysical properties, a derivatographic analysis was performed, which includes TGA and DTA, two vulcanized rubber-woven samples from rubbers of grades 51-1615, 51-2110 together with arimide fiber. For the first time, results were obtained using ethylene-propylene-diene rubbers, including modification with a phenol-formaldehyde resin, which gives a higher erosion resistance when exposed to high-speed heat flow. Analysis of the results of experimental studies has shown that the use of arimide fiber can provide higher strength and thermophysical properties of heat-protective materials. In general, the results obtained may be of practical significance for the development of new-generation products.

scholarly journals Improving the functioning efficiency of 6-10 kV electrical networks with isolated neutral in conditions of single-phase ground faults

2021 ◽  
Vol 288 ◽  
pp. 01010
Author(s):  
Alexander Nikolaevich Kachanov ◽  
Vadim Alekseevich Chernyshov ◽  
Boris Nikolaevich Meshkov ◽  
Marsel Sharifyanovich Garifullin ◽  
Evgeny Alexandrovich Pechagin
Keyword(s):  
Single Phase ◽  
Climatic Factors ◽  
Experimental Studies ◽  
Electrical Energy ◽  
Distribution Networks ◽  
Electrical Network ◽  
Electrical Safety ◽  
Electrical Networks ◽  
Isolated Neutral ◽  
Remote Identification

The main objectives of this publication are: 1) to attract the attention of energy specialists to the problems of reliability and electrical safety of 6-10 kV overhead electrical networks with isolated neutral, operating in conditions of single-phase insulation damage; 2) substantiation of the feasibility of introducing a fundamentally new way to improve the efficiency of 6-10 kV distribution networks, based on the resonanceless limitation of the single-phase ground fault current arising from the breakdown of the insulator and the use of its own infrastructure of the electrical network for remote identification of the place of its occurrence. The expediency of including a nonlinear surge suppressor between the traverse and the grounding outlet of the reinforced concrete support is confirmed by the positive results of experimental studies carried out on the basis of high-voltage testing laboratories of IDGC of Center PJSC - Orelenergo and EnerGarant LLC. The use of deductive analysis allowed the authors to select a reliable and affordable electrical insulating material installed between the support and the traverse, as well as to formulate the main requirements for it, including taking into account weather and climatic factors. The analysis of various methods of transmitting information about the place of occurrence of the insulator damage made it possible to establish the predominant advantage of a wired communication channel using its own 6-10 kV electric network infrastructure. The authors have developed an original circuitry solution that provides remote identification of the insulator damage location using a thyristor shunting the nonlinear surge suppressor, according to a given switching algorithm, and also provides local identification of the insulator breakdown by means of special signaling devices with volatile power supply. It is expected that the proposed method, with relatively low investment, will significantly reduce the level of accidents and electrical hazards in overhead distribution networks of 6-10 kV, as well as minimize the costs associated with their operation and undersupply of electrical energy.

scholarly journals Experimental Studies of the Developed Method for Determining the Insulation Parameters in an Asymmetric Network by a Voltage up to 1000 V at Mining Enterprises

2020 ◽  
Vol 220 ◽  
pp. 01032
Author(s):  
A. B. Utegulov ◽  
I. V. Koshkin ◽  
A. I. Koshkina
Keyword(s):  
Phase Shift ◽  
Experimental Studies ◽  
Electrical Network ◽  
Electrical Networks ◽  
Phase Voltage ◽  
Line Voltage ◽  
Satisfactory Accuracy ◽  
Three Phase ◽  
Before And After

In the work experimental studies of the developed method for determining the insulation parameters in an asymmetric electrical network by a voltage up to 1000 V at mining enterprises were carried out. It is based on measuring the module values of line voltage, angle of phase shift between vectors of damaged phase voltage relative to the ground and line voltage at two other phases, as well on measuring the module value of damaged phase voltage relative to the ground before and after connecting additional capacitive conductivity between the network’s phases and the ground. The results of experiment showed that the developed method for determining the insulation parameters has satisfactory accuracy and safety when operating three-phase electrical networks by voltage up to 1000 V at mining enterprises.

scholarly journals Research of higher harmonic components of voltage and current and their influence on the functioning of shipboard electrical equipment

2021 ◽  
pp. 34-43
Author(s):  
В.Ф. Белей ◽  
Г.А. Решетников ◽  
К.В. Коротких
Keyword(s):  
Experimental Studies ◽  
Electrical Energy ◽  
Electrical Equipment ◽  
Electrical Network ◽  
Electric Motors ◽  
Electrical Networks ◽  
Higher Harmonic ◽  
Harmonic Components ◽  
Quality Of Electrical Energy ◽  
Asynchronous Electric Motors

Одним из направлений научно-технического прогресса на объектах морской индустрии является широкое использование технологий, основанных на нелинейных элементах, что позволяет значительно снизить их массогабаритные показатели и расшить их функциональные возможности. Однако применение таких технологий приводит к ухудшению качества электрической энергии, в первую очередь за счет высших гармонических составляющих напряжения и тока. В статье показана природа высших гармонических, выполнен анализ разделов «Правил классификации и постройки морских судов. 2021», российских и ряда зарубежных стандартов в области качества электроэнергии, регламентирующих уровень высших гармонических составляющих напряжения и тока в электрических сетях и системах. В работе приведены результаты теоретических и экспериментальных исследований влияния высших гармонических составляющих на функционирование судового электрооборудования: асинхронных электродвигателей, силовых кабелей, трансформаторов, конденсаторных батарей и систем освещения. Определены выражения, позволяющие оценить это влияние. Показано, что в основном это влияние проявляется: в дополнительном нагреве электрооборудования за счет поверхностного эффекта; вибрации асинхронных электродвигателей при высоких значениях 5 и 7 гармоник напряжения судовой электрической сети. One of the areas of scientific and technological progress at the facilities of the marine industry is the widespread use of technologies based on nonlinear elements, which can significantly reduce their weight-size parameters and dimensions and expand their functional capabilities. However, the use of such technologies leads to a deterioration in the quality of electrical energy, primarily due to higher harmonic components of voltage and current. The article shows the nature of higher harmonics, analyzes the sections of the «Rules for the Classification and Construction of Sea-Going Vessels. 2021», Russian and a number of foreign standards in the field of electric power quality, regulating the level of higher harmonic components of voltage and current in electrical networks and systems. The paper presents the results of theoretical and experimental studies of the influence of higher harmonic components on the functioning of shipboard electrical equipment: asynchronous electric motors, power cables, transformers, capacitor banks and lighting systems. Formulas have been determined to assess this effect. It is shown that the influence is mainly manifested: in additional heating of electrical equipment due to the skin effect; vibrations of asynchronous electric motors at high values of 5th and 7th voltage harmonics of the ship's electrical network.

scholarly journals About Flexibility Problem of Distribution Electrical Network

2019 ◽  
Vol 217 ◽  
pp. 01014
Author(s):  
Ilia Shushpanov ◽  
Konstantin Suslov
Keyword(s):  
Control Systems ◽  
Relay Protection ◽  
Weather Conditions ◽  
Electrical Network ◽  
Operating Parameters ◽  
Electrical Networks ◽  
Information Communication ◽  
Emergency Control ◽  
Measuring Devices ◽  
Short Circuits

Global electricity companies have embarked on a transition to digital microprocessor devices. Digitalization penetrates every aspect of power industry, whether it is power generation, transmission or distribution. Being the most widespread, the distribution electrical networks are nevertheless the least digitalized. Some issues about them are still insufficiently studied. These are the collection of necessary information, adaptation methods, and the effect of the unrecognizability of some short circuits. This can be explained by improper placement of devices, which causes lack of data, which, in turn, leads to the failure of relay protection and emergency control systems of distribution electrical networks to provide selectivity. The paper proposes algorithms for placing measuring devices so that the information will be collected properly. Placement of the devices will allow adjusting the operating parameters of the relay protection and emergency control systems depending on changes in external weather conditions and load fluctuations in the network. We propose a technique for control of distribution network, taking into account the type of damage in case of emergency in real time, and a technique for placement of measuring devices and creation of an information communication network.

Features of asymmetric short circuit currents calculation in the elplek software product

2021 ◽  
pp. 113-127
Author(s):  
O. Gai ◽  
◽  
V. Bodunov ◽  
A. Zhiltsov ◽  
◽  
...  
Keyword(s):  
Power Systems ◽  
Short Circuit ◽  
Active Part ◽  
Electrical Network ◽  
Electrical Networks ◽  
Software Products ◽  
Software Product ◽  
Short Circuits ◽  
Infinite Power ◽  
Short Circuit Currents

In order to simplify the analysis of the electrical networks operation modes , specialized software tools for mathematical modeling of processes in them are used. There are many software products, but most of them are paid. To carry out research in complex power systems and obtain results in certain sections when performing practical and course work, as well as at certain stages of research, the authors actively use the free software product «Elplek», but in a deeper study of the software encountered certain features some parameters, which differ slightly from the generally accepted domestic method, which led to an error in the calculations in some versions of the schemes of power systems. The purpose of the research is to study the peculiarities of calculating the characteristics of asymmetric short circuits in the software product "Elplek" and to check the adequacy of the formed models. At the first stage, the object of research was chosen – this is a segment of the electrical network containing a small number of nodes and a theoretical calculation of the searched parameters of the short circuit mode in this segment of the electrical network was carried out. In the future, an approach was proposed on the task of parameters of elements in the software product "Elplek" and based on this approach, modeling was carried out as a result of which the results were obtained under the condition of the system's task, as sources of infinite power and calculations for the active part differ by 0.013%, and by reactive – 0.004%; subject to the task of the system, as sources of a certain power and calculations on the active part differ by 0.0046%, and on the jet - 0.0044%, which makes it possible to assert the feasibility of using the proposed approach in the analysis of indicators of emergency modes of complex schemes of electrical supply to consumers of certain segments of electric power systems. Features of calculation of characteristics of asymmetric short circuits in the Elplek software product are considered and the adequacy of the generated models is checked. Key words: power system segment modeling, Elplek software product, element parameter setting, single-phase short-circuit currents

Sign in / Sign up

Export Citation Format

Share Document