scholarly journals THE METHOD OF CONTINUOUS AUTOMATED RESISTANCE CONTROL OF HIGH VOLTAGE MOTOR INSULATION

2020 ◽  
pp. 94-101
Author(s):  
Galina A. Kravchenko ◽  
Elvira L. Lvova ◽  
Alexey M. Makarov ◽  
Sergey V. Stolyarov
Keyword(s):  
High Voltage ◽  
Asynchronous Motor ◽  
Electrical Power ◽  
Electric Machines ◽  
Automated System ◽  
Software Modeling ◽  
Automated Control ◽  
Industrial Operation ◽  
Stator Windings ◽  
Diagnostic Complex

Electrical machines are widely used in various branches of the national economy. In particular, electric motors are one of the main elements in electrical power generation systems. The electric machines used at this ensure reliable operation of individual power units and the entire power supply system in general. The reliability of engines’ operation is largely determined by the quality of its insulation, that is why the improvement of methods for controlling the isolation of high voltage asynchronous motors is an actual task. The aim of the research is to develop a method of continuous automated control of electric insulation condition in stator windings of an asynchronous motor basing on the analysis of experimental and industrial operation data making it possible to estimate the dynamics of changes in the main insulation parameters. The main elements showing reliability of high-voltage electric machines, applied electro-insulation structures, methods for controlling insulation resistance in a high-voltage electric motor are considered in the article. The research performed was based on the results of the experimental and industrial operation of the automated system of insulation control under working voltage at the real facility carried out by the group of companies «Energopribor» of the town of Cheboksary. The analysis of existing methods for insulation control is given, the scheme of insulation control by superpositioning test current with the frequency which is different from industrial one. The authors propose the method to estimate the dynamics of resistance changes in insulation of stator windings of the asynchronous motor, to reveal its approximation to the maximum permissible state in the process of operation and in reserve shutdown. Software modeling was carried out, the results of which correspond to the data of experimental and industrial operation. The results obtained during the research allowed to systematize the obtained experimental data, to modernize the hardware part of the diagnostic complex DUKAT-SCAD, to outline the criteria area for its applicability.

scholarly journals Determination of Parameters of Asynchronous Electric Machines with Asymmetrical Windings of Electric Locomotives

2019 ◽  
Vol 21 (2) ◽  
pp. 24-31
Author(s):  
Sergey Goolak ◽  
Juraj Gerlici ◽  
Viktor Tkachenko ◽  
Svitlana Sapronova ◽  
Tomas Lack ◽  
...  
Keyword(s):  
Magnetic Energy ◽  
Asynchronous Motor ◽  
Electric Machines ◽  
Technical Solution ◽  
Electric Locomotive ◽  
Stator Windings ◽  
Motor Circuits ◽  
Determination Of Parameters ◽  
Geometrical Dimensions

This article is devoted to development of a method for calculating the parameters of an asynchronous motor of an electric locomotive with asymmetrical windings of stator and rotor. A method for determining self and mutual inductances of the stator and rotor phases of an asynchronous motor with asymmetric windings and their relations to mechanical variables is proposed. It is based on comparing two equations of stored magnetic energy, one equation calculated through induction, magnetic field strength and geometrical dimensions and another equation calculated through the parameters of the motor circuits. It is shown that the obtained solutions correspond to the previously existing methods, but they give the additional possibilities in mathematical modeling. The proposed technical solution allows higher accuracy developing of a mathematical model of a drive with an asynchronous motor having asymmetrical stator and rotor windings for studying dynamic processes during the operation of the specified drive, in particular, the drive of auxiliary machines for electric locomotive, where an asynchronous motor with asymmetrical stator windings is used as a phase release.

Rational Choice of Information Form Converters for Automated Systems in Construction

2020 ◽  
pp. 60-65
Keyword(s):  
Rational Choice ◽  
Construction Industry ◽  
Correct Choice ◽  
Automated System ◽  
Digital Code ◽  
Automated Control ◽  
Sigma Delta ◽  
Processor Core ◽  
Building Monitoring ◽  
High Level

In automated control systems for technical processes, the conversion of a continuous signal into a digital code and vice versa from a digital code to a continuous (analog) value is widely used. For direct type converters often used the term ADC, the reverse - DAC. The characteristics of the converters often dramatically affect the parameters of the entire automated system. The importance of the correct choice of ADCs and DACs has especially increased recently in connection with the mass introduction of microcontrollers MC. Indeed, in addition to the ADC and DAC, it is necessary to place the processor core in the microcontroller's crystal, I/O interfaces and many other elements necessary for the functioning of the MC. The use of information converters in the construction industry imposes additional requirements on converters: for example, in building monitoring systems, precision ADCs with extremely high accuracy are often required (while performance may be low), in other applications it is necessary to provide the necessary parameters at a high level of industrial interference, etc. This article explores issues related to the rational choice of ADCs and DACs, taking into account current trends in the IT field and the specifics of work in the construction industry. Sigma-Delta converters are noted as the most promising models of direct type converters.

DESIGN FEATURES OF THE AUTOMATIZED MANAGEMENT SYSTEM DEVELOPMENT FOR A TOURIST AND RECREATIONAL COMPLEX

2020 ◽  
Vol 2020 (4) ◽  
pp. 40-52
Author(s):  
Aleksey Beleychenko ◽  
Vladimir Averchenkov
Keyword(s):  
Management System ◽  
System Development ◽  
Tourism Industry ◽  
Automated System ◽  
Automated Control ◽  
Research Areas ◽  
Automated Control System ◽  
Tourism Sector ◽  
District Management ◽  
Characteristic Features

This research examined the problems of the tourism sector of the economy, that was described from the perspective of potential informatization. The features of the tourism industry functioning were reflected, some proposals were put forward regarding the design and development of an automated management system, and the geographical affiliation of the research areas were indicated. The tourist and recreational complex was proposed to understand as a separate component of the tourism industry, and was accordingly accepted as the object for the projected automated system. The authors had refined the formulation of the term "tourist and recreational complex" as a complex socio-economic system based on the problems and possibilities of it’s informatization. Sufficient attention was paid to the identification of the characteristic features of the tourist and recreational complex, to the designation and addition of its functions, to the possibilities and difficulties of formalization. Some features and problems of the designing an automated control system were described in this research, there were also suggests about its conceptual structure, and outlines the for further research. Special attention was paid to the developing of the automated system for managing the tourist and recreational complex, based on the requests, needs and capabilities of its three main groups of users: regional (district) management, business and guests (tourists, recreants).

Жизнеобеспечение экипажа пилотируемого космического объекта, проблемы управления

2019 ◽  
pp. 109-120
Author(s):  
Boris F. ZARETSKIY ◽  
Arkadiy S. GUZENBERG ◽  
Igor A. SHANGIN
Keyword(s):  
Control System ◽  
Life Support ◽  
Support Systems ◽  
Space Missions ◽  
Automated System ◽  
Deep Space ◽  
Automated Control ◽  
Life Support Systems ◽  
Long Duration ◽  
Space Life Support

Life support for first manned spaceflights was based on supplies of consumables. Crew life support systems based on supplies of water and oxygen, in spite of their simplicity, are extremely inefficient in orbital space missions and are unfeasible in deep space missions because of mass and volume constraints. Therefore, there are currently developed and are to be used on space stations the life support systems that are based on chemical and physical regeneration of water and oxygen extracted from human waste. In view of further advances in long-duration orbital stations, and the prospects of establishment of planetary outposts and deep space exploration, the problem of constructing an automated system for controlling a suite of regenerative LSS becomes urgent. The complexity of solving the problem of constructing an efficient control system in this case owes to the existence of a large number of effectiveness criteria. The paper proposes a system of consolidated global efficiency criteria, which allows to break up this problem into a series of sub-problems of optimization in order to solve this problem. The proposed criteria are longevity, cost, comfort. The paper presents a series of specific examples of using the proposed principles with necessary generalizations. Key words: space life support systems, atmosphere revitalization equipment, automated control system, global generalized efficiency criteria, longevity, cost, comfort.

scholarly journals Analysis of Electric Field and Current Density for Different Electrode Configuration of XLPE Insulation

2018 ◽  
Vol 7 (3.36) ◽  
pp. 127 ◽  
Author(s):  
Nishanthi Sunthrasakaran ◽  
Nor Akmal Mohd Jamail ◽  
Qamarul Ezani Kamarudin ◽  
Sujeetha Gunabalan
Keyword(s):  
Electric Field ◽  
Power System ◽  
Field Distribution ◽  
High Voltage ◽  
Current Density ◽  
Electric Field Distribution ◽  
Electrical Power ◽  
High Electric Field ◽  
Electrode Configuration ◽  
Maximum Electric Field

The most important aspect influencing the circumstance and characteristics of electrical discharges is the distribution of electric field in the gap of electrodes. The study of discharge performance requires details on the variation of maximum electric field around the electrode. In electrical power system, the insulation of high voltage power system usually subjected with high electric field. The high electric field causes the degradation performance of insulation and electrical breakdown start to occur. Generally, the standard sphere gaps widely used for protective device in electrical power equipment. This project is study about the electric field distribution and current density for different electrode configuration with XLPE barrier. Hence, the different electrode configuration influences the electric field distribution. This project mainly involves the simulation in order to evaluate the maximum electric field for different electrode configuration. Finite Element Method (FEM) software has been used in this project to perform the simulation. This project also discusses the breakdown characteristics of the XLPE. The accurate evaluation of electric field distribution and maximum electric field is an essential for the determination of discharge behavior of high voltage apparatus and components. The degree of uniformity is very low for pointed rod-plane when compared to other two electrode configurations. The non- uniform electric distribution creates electrical stress within the surface of dielectric barrier. As a conclusion, when the gap distance between the electrodes increase the electric field decrease.  

scholarly journals Formation of energy efficient start-brake modes of the frequency-controlled electric drive in production mechanism

2019 ◽  
Vol 104 ◽  
pp. 01006
Author(s):  
Maxim Filimonov ◽  
Nicolay Karnaukhov ◽  
Eugeny Lukyanov ◽  
Dmitry Smyatsky ◽  
Roman Mironenko
Keyword(s):  
Energy Efficient ◽  
Supply Voltage ◽  
Asynchronous Motor ◽  
Electrical Power ◽  
Production Mechanism ◽  
Mass Model ◽  
Electrical Drive ◽  
Asynchronous Motors ◽  
Production Mechanisms ◽  
Nominal Mode

this article the energy efficient frequency way of starting of production mechanisms electrical drive with low power asynchronous motors (from 90 Wt to 5 kWt) is proposed. To provide this With the goal of electrical losses decreasing during asynchronous motor starting the Pontryagin Maximum Principle have been applied by the authors when analysing of two-mass model of production mechanism frequency controlled electrical drive. In result of calculations for frequency controlled electrical drive of production mechanism with 90 Wt power asynchronous motor of the model 4AA50A2 Dependencies of amplitude and frequency of supply voltage by the time are obtained. These dependencies confirm possibility of decreasing the electrical power losses with different values of motor shaft load torques. In compare with the other ways of asynchronous motor starting (for example U/f=const) they allow to decrease the electrical losses more then two times in nominal mode.

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