Neglect of Differentiation — Loss of Competitive Advantage (Example of Russian Producers of Fittings for NPP)

10.12737/3651 ◽  
2014 ◽  
Vol 2 (2) ◽  
pp. 30-33
Author(s):  
Плахотникова ◽  
E. Plakhotnikova
Keyword(s):  
Electric Drive ◽  
Nuclear Power ◽  
Quality Criterion ◽  
Delivery Time ◽  
Federal Law ◽  
Production Potential ◽  
Electric Drives ◽  
Power Characteristics ◽  
Almost All ◽  
System Characteristics

Purchase of equipment for a nuclear power plant is carried out by Rosenergoatom concern according to the Federal law No. 223-FZ “About purchases of goods, works, services by separate types of legal entities” dated 18.07.2011. Among the main criteria of assessment are quality, supplier’s reliability, delivery time and price. Considering that in such tenders the reliable suppliers participate which possess of considerable production potential and capable in tight deadlines and approximately equal terms to fabricate and supply an equipment, and that quality criterion is estimated on compliance of technical characteristics which have been set in tender documentation to characteristics specified in suppliers’ demands, the basis for decision-making on a contract award is first of all a price. The price of electro-driving fittings depends on a basic cost of electric drive and shutoff valves. Through a comparative analysis of electrodriving shutoff valves of various producers it has been established that in some cases for management of absolutely identical shutoff valves foreign and domestic producers use the electric drives of various power. The use of more powerful electric drive as an actuation device in Russia considerably increases a system cost and therefore reduces domestic production competitiveness at tender purchases. The reason of competitiveness decrease is connected with incorrectness of fittings’ power characteristics calculation techniques which are used by almost all fittings manufacturers of Russia, and unreasonably overestimated power system characteristics as a result of unification. Revision of expediency of the unification accepted still in the last century can reduce considerably the price of domestic systems of electro-driving shutoff valves and increase the production’s competitiveness and quality.

ELECTRIC DRIVE, ITS CONDITION AND PROSPECTS

2020 ◽  
Author(s):  
N.D. Kobzeva ◽  
◽  
R.S. Durov ◽  
E.V. Varnakova ◽  
K.O. Kobzev ◽  
...  
Keyword(s):  
Electric Drive ◽  
The State ◽  
Electric Drives

The known definitions for the concept of "electric drive"are given. The analysis of the state of electric drives in Russia is made. The requirements imposed on them are stated. The main criteria for improvement and development are formulated.

SIMULATION OF SOFT START OF SYNCHRONOUS ELECTRIC DRIVES

2019 ◽  
Author(s):  
Shakhboz Dadabaev
Keyword(s):  
Computer Simulation ◽  
Electric Drive ◽  
Water Supply Systems ◽  
Factors Affecting ◽  
Electric Drives ◽  
Soft Start ◽  
Simulation Results ◽  
Pumping Units ◽  
Negative Factors ◽  
Supply Systems

The main negative factors affecting the starting modes of synchronous electric drives of pumping units of irrigation water supply systems were identified, computer simulation of direct and soft start of synchronous electric drive was made, the simulation results are shown in graphs and a brief conclusion was made on the study.

scholarly journals MODELLING OF FREIGHT FLOWS DISTRIBUTION AT THE TRANSPORT TERMINAL

Transport ◽  
2004 ◽  
Vol 19 (2) ◽  
pp. 86-91 ◽  
Author(s):  
Adolfas Baublys
Keyword(s):  
Carrying Capacity ◽  
Topological Structure ◽  
Road Transport ◽  
System Structure ◽  
Delivery Time ◽  
Structural System ◽  
Regional System ◽  
Time Limitations ◽  
System Characteristics

The task model has been formulated for users of freight flows at a distribution transport terminal, which enables gauging vehicles possibilities (dimensions, carrying capacity), delivery time limitations, resources of vehicle time and general costs. The synthesis of the topological structure of the freight road transport regional system has been performed. It enables the evaluation of an impact on the functioning of the system exercised by various structural system characteristics, thus improving the quality of project solutions at the stage of synthesis of the system structure.

scholarly journals Deformation Analysis of Bridges in Exceptional Transports in Slovenia

2012 ◽  
Vol 22 (1) ◽  
pp. 15-22 ◽  
Author(s):  
Rok Kamnik ◽  
Boštjan Kovačič ◽  
Andrej Štrukelj
Keyword(s):  
Nuclear Power ◽  
Polynomial Interpolation ◽  
Hydraulic Cylinder ◽  
Load Test ◽  
Deformation Analysis ◽  
Concrete Plate ◽  
Vertical Displacements ◽  
Logistic Service ◽  
Heavy Loads ◽  
Almost All

In August 1999 an exceptional transportation of two steamers of 666 tonnes was performed from the Port of Koper to the Nuclear power plant in Krško. The transport covered a distance of about 200km and represented one of the largest exceptional transports in Slovenia ever. Finding the best route represented one of the major issues, because the steamers had to cross more than 50 problematic sections and bridges, most of which have not been designed for such heavy loads. It was necessary to load-test almost all bridges on the route to determine whether those bridges need any extra supports or not. Consequently, a logistic operator has an important and indispensable role and becomes a co-modeller of logistic service. A deformation analysis or a polynomial interpolation of vertical displacements could also be used. Therefore, a laboratory load test of a concrete plate was made. The concrete plate was loaded with hydraulic cylinder PZ 100 with extensiometer up to 21kN. Every increase of load by 3kN was measured with Nikon Ser 800 total station. KEY WORDS: deformation analysis, exceptional transport, bridges in Slovenia

scholarly journals Computer Modeling of Pumping Station with Unregulated Electric Drive

2020 ◽  
Vol 220 ◽  
pp. 01039
Author(s):  
Shakhboz Dadabaev ◽  
Elena Gracheva
Keyword(s):  
Electric Drive ◽  
Electromagnetic Torque ◽  
Electric Motors ◽  
Motor Speed ◽  
Electric Drives ◽  
Pumping Station ◽  
Soft Start ◽  
Soft Starter ◽  
Pumping Units ◽  
Static Torque

The results of the analysis of transient and technological processes of the irrigation pumping station of the first lift, taking into account the negative starting effects on the synchronous electric drive, are considered. The analysis and review of the ways of regulating the performance of the units of the irrigation pumping station of the first lift are made, and the main difficulties of the existing methods of regulating the pump supply are revealed. Computer simulation of starting modes of high-voltage synchronous electric motors with direct and soft start, where soft starter was used for soft start, was carried out. The simulation took into account the changes in the currents of all phases of the electric motor, the electromagnetic torque, the motor speed, the effective value of the current, as well as the static torque. The introduction of semiconductor soft starters for electric drives of high-power pumping units has been substantiated.

scholarly journals Social development of Russian nuclear power plant cities

2019 ◽  
pp. 20-30
Author(s):  
V. A. Lazarenko
Keyword(s):  
Power Plant ◽  
Nuclear Power Plant ◽  
Social Development ◽  
Nuclear Power ◽  
Socioeconomic Development ◽  
Power Industry ◽  
Nuclear Power Industry ◽  
Historical Factors ◽  
Almost All ◽  
The City

The article presents the analysis of the influence of historical factors on the development of Russian cities of nuclear power industry and the genetic types of these cities. Most of these cities are young, their socioeconomic state depends on the city-forming enterprise. The formation and development of nuclear power plant (NPPs) cities went in two ways: the city was built in parallel with the nuclear power plant (e.g., Novovoronezh, Desnogorsk, Kurchatov); the NPP was built near the settlement, and then NPP has influenced on socioeconomic development of the settlement, its employment structure, etc. (Volgodonsk and Balakovo). In USSR/Russia practice, the first way dominated, when an urban-type settlement was built near a NPP, such settlement then intensively grew and developed into a city. There are three types of Russian cities with NPPs: the cities formed and developed before the construction of the NPP; the cities developed due to the operation of NPPs, and the cities created and developed due to the operation of NPPs. It was found that the factor of formation of nuclear power industry in the city is decisive in the social development of almost all cities of NPPs and affects their current state.

scholarly journals Development of a high-quality brushless dc electric drive systems model

Vestnik IGEU ◽  
2020 ◽  
pp. 31-45
Author(s):  
T.H. Abuziarov ◽  
A.S. Plehov ◽  
A.B. Dar’enkov ◽  
A.I. Ermolaev
Keyword(s):  
Electric Drive ◽  
Electric Motor ◽  
Permanent Magnets ◽  
Structural Features ◽  
Bldc Motor ◽  
Electric Drives ◽  
Brushless Dc ◽  
Systems Model ◽  
Semiconductor Converter ◽  
Torque Pulsations

When designing electric drives based on brushless DC motors with permanent magnets (BLDC), which have low level torque pulsations, the problem of modelling non-standard topological solutions appears. The known models of BLDC motors are either based on the assumptions about the symmetry of the stator pa-rameters of the electric motor and/or the ideal form of the phase back-EMF waveform, which reduce the accuracy of evaluating the effectiveness of the proposed solutions or prove unusable for modelling an operation of the electric motor with a non-standard semiconductor converter. It is necessary to develop a mathematical model of the BLDC motor-based electric drive that takes into account the structural features of the electric motor and allows for semiconductor converter configuration variability. The model is designed in the Matlab Simulink environment. The verification is carried out by comparing the modelling results with experimental data obtained previously by other researchers. The proposed method for generating phase back-EMF in the BLDC motor model provides the possibility for the user to set the EMF form templates independent for each phase. The proposed method for stator circuit simulating provides the user with access to each of the stator windings leads as well as with the possibility of asymmetric determination of each parameter of the electric motor. Upon verification, it has been shown that the difference in the control points between the simulated and experimental speed-torque curves does not exceed 3,5 %. The developed model allows analyzing the static and dynamic characteristics of operation modes of non-standard topology BLDC motor-based electric drives taking into account the stator pa-rameters asymmetry and the real phase back-EMF waveform. The specified features of the model allow exploring the operation of the designed electric drive, taking into account the BLDC motor and converter design. The model can be applied when checking atypical design decisions and when changing the set parameters of the electric drive and restrictions on working conditions and target functions to refine the control system algorithms and automate the search for optimal parameters of the motor and the semiconductor converter.

Utilization of Thorium in LWR Fuels Aiming at Thermal Conductivity Improvements

2016 ◽  
Author(s):  
Jan Kubáň ◽  
Radek Škoda
Keyword(s):  
Thermal Conductivity ◽  
Uranium Dioxide ◽  
Nuclear Power ◽  
Fuel Pellet ◽  
Thorium Dioxide ◽  
Heterogeneous Distribution ◽  
Thermal Output ◽  
Homogenous Distribution ◽  
Limiting Parameters ◽  
Almost All

One of the main drawbacks of uranium dioxide, which is used in almost all nuclear power reactors, is its low thermal conductivity. As a consequence, temperature at the center of fuel pellet is relatively high, because heat is poorly conducted away. To reach a higher level of safety, maximal temperature in any fuel pellet is one of the main limiting parameters, which restrict the fuel thermal output. This paper deals with the use of thorium in LWR fuels with the objective of fuel pellet maximal temperature reduction. Research investigating homogenous distribution of thorium dioxide (thoria) in uranium dioxide fuel has already been done and did not lead to considerable thermal conductivity improvements. The aim of this study is to investigate heterogeneous distribution of thorium in commonly used uranium dioxide fuel in the form of uranium and thorium pellets placed together.

scholarly journals Study of spindle drives for boring machines

2019 ◽  
Vol 287 ◽  
pp. 01026 ◽  
Author(s):  
Marin Zhilevski ◽  
Mikho Mikhov
Keyword(s):  
Electric Drive ◽  
Machine Tools ◽  
Experimental Studies ◽  
Program Control ◽  
Electric Drives ◽  
Technological Processes ◽  
Boring Machines ◽  
Drive Systems

This paper examines the main requirements for the electric drive systems of a class of boring machines with digital program control. On this basis, a methodology for choice of the spindle drives is offered. The algorithm takes into account the specific features of the technological processes, the treated materials, the tools used and their wear, as well as the mechanical gear types. The experimental studies of the implemented electric drives for the spindle are presented and discussed. The research carried out and the results obtained can be used in the development of such drives for the studied class of machine tools.

scholarly journals Synchronization of Auxiliary Mechanisms and Main Electric Drive of the Pipe Cold-Rolling Mill. Complete Solution

Machines ◽  
2020 ◽  
Vol 8 (4) ◽  
pp. 71
Author(s):  
Vsevolod Ostrouhov ◽  
Dmitry Sychev ◽  
Maxim Grigorev
Keyword(s):  
Cold Rolling ◽  
Electric Drive ◽  
Complete Solution ◽  
Descent Method ◽  
Optimal Number ◽  
Geometrical Parameters ◽  
Gradient Descent Method ◽  
Least Squares Regression ◽  
Electric Drives ◽  
Synchronous Reluctance Motor

This article deals with installations with complex and nonstandard executive instrument movement. Having analyzed the technical implementation and operational features of cold-rolling pipe mills, the research team formulated the problem of synthesizing electric drives of auxiliary mechanisms. It is shown that the conditions for choosing a mechanical converter are associated with the oscillation of the processes of the electric drive system. The finite element method and the gradient descent method are used for structural analysis of solids and electromagnetic calculations. The data of the specific cost of semiconductor converters were analyzed using a linear least-squares regression technique. The advantages of a synchronous reluctance motor of independent excitation for the electric drives of auxiliary mechanisms are given and substantiated. The optimization of the geometrical parameters of the electromechanical converter was carried out according to the maximum developed electromagnetic torque. Modern semiconductor technology in the design of special-purpose electric drives leads to a revision of the principles for determining the optimal number of phases and the structure of the motor power supply. The rationale for the use of multilevel frequency converters is given. Taking into account an in-depth preliminary analysis and an integrated approach, these tasks were successfully completed, which was confirmed experimentally at the implementation of the developed system.

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