scholarly journals RESONANT ELECTROMAGNETIC PROCESSES AT UNSTABLE OPERATION OF SLIDING CURRENT COLLECTOR UNITS OF TURBOGENERATOR

2021 ◽  
Vol 3 ◽  
pp. 281-285
Author(s):  
Igor Plokhov ◽  
Igor Savraev ◽  
Alexander Ilyin ◽  
Oksana Kozyreva ◽  
Alexander Dementiev
Keyword(s):  
Mathematical Modeling ◽  
Current Collector ◽  
Current Collection ◽  
Electromagnetic Processes ◽  
Electromagnetic Oscillations

The article is devoted to study of the resonance electromagnetic oscillations arising during unstable operation of the sliding current collection unit of turbo-generators. Mathematical modeling of these processes is carried out. It has been established that it is these processes that are the main cause of increased sparking and “ring fire” or “breakdown of commutation” on contact rings.

scholarly journals Increasing the forecasting fidelity of current collection system operating capability by means of contact pressure simulation modelling

2020 ◽  
Vol 217 ◽  
pp. 03003
Author(s):  
Anton Golubkov ◽  
Gleb Ermachkov ◽  
Aleksandr Smerdin ◽  
Oleg Sidorov ◽  
Victor Philippov
Keyword(s):  
Automatic Control ◽  
Control Systems ◽  
Contact Pressure ◽  
Current Collector ◽  
Limiting Factors ◽  
Movement Speed ◽  
Contact Wire ◽  
Current Collection ◽  
Automatic Control Systems ◽  
The Impact

Current collection quality is one of the limiting factors when increasing trains movement speed in the rail sector. With the movement speed growth, the impact forces on the current collector from the rolling stock and the aerodynamic influence increase, which leads to the spread in the contact pressure values, separation of the current collector head from the contact wire, contact arcing and excessive wear of the contact elements. The upcoming trend in resolving this issue is the use of the automatic control systems providing stabilization of the contact pressure value. The present paper considers the features of the contemporary automatic control systems of the current collector’s pressure; their major disadvantages have been stated. A scheme of current collector pressure automatic control has been proposed, distinguished by a proactive influence on undesirable effects. A mathematical model of contact strips wearing has been presented, obtained in accordance with the provisions of the central composition rotatable design program. The analysis of the obtained dependencies has been carried out. The procedures for determining the optimal current collector pressure on the contact wire and the pressure control principle in the pneumatic drive have been described.

scholarly journals MATHEMATICAL MODELING OF ELECTROMAGNETIC PROCESSES OF CYLINDRICAL SHIELDS

2016 ◽  
Vol 6 (4) ◽  
pp. 123-125
Author(s):  
A.G. Shcherbinin ◽  
◽  
A.S. Mansurov ◽  
A.A. Poroshin ◽  
◽  
...  
Keyword(s):  
Mathematical Modeling ◽  
Electromagnetic Processes

scholarly journals The Development of Current Collection in Micro-Tubular Solid Oxide Fuel Cells—A Review

2021 ◽  
Vol 11 (3) ◽  
pp. 1077
Author(s):  
Oujen Hodjati-Pugh ◽  
Aman Dhir ◽  
Robert Steinberger-Wilckens
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Power Density ◽  
Mechanical Stability ◽  
Current Collector ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Current Collection ◽  
Start Up

Micro-tubular solid oxide fuel cells (µT-SOFCs) are suited to a broad range of applications with power demands ranging from a few watts to several hundred watts. µT-SOFCs possess inherently favourable characteristics over alternate configurations such as high thermo-mechanical stability, high volumetric power density and rapid start-up times, lending them particular value for use in portable applications. Efficient current collection and interconnection constitute a bottleneck in the progression of the technology. The development of current collector designs and configuration reported in the literature since the inception of the technology are the focus of this study.

A Laboratory Model Study of a Railway Current Collection System

2007 ◽  
Author(s):  
Lars Drugge ◽  
Anders Lennartsson ◽  
Annika Stensson Trigell
Keyword(s):  
High Speed ◽  
Dynamic Properties ◽  
Current Collector ◽  
Laboratory Model ◽  
Contact Wire ◽  
Current Collection ◽  
Model Study ◽  
Stiffness Variation ◽  
Curved Track ◽  
Catenary System

A vital system on modern high-speed electric trains is the overhead catenary system and the pantograph current collector. As speed limits are increased, train operators and railway engineers need measures of system performance in a number of situations. In this work a laboratory model is built to study the pantograph behaviour on curved track running on a catenary system with large stiffness variation. The model is designed to be simple, yet exhibit the most characteristic dynamic properties of the real system. Another objective is the possibility to run the pantograph at speeds near the wave propagation velocity of the contact wire. The situation of several trailing pantographs, with even spacing, which excites the system to steady state, is considered. Effects of changes in design features such as tension in the contact wire and torsion and translation stiffness of components in the pantograph are studied for different speeds. The interaction is complex and the performance depends on the dynamic properties of both the catenary system and the pantograph. The results show that the pantograph configuration mainly affects the size of amplitudes in the system while the contact wire tension influences at which velocities large amplitudes and contact losses occur.

scholarly journals Development of requirements for logic controls of the speed lines catenary system maintenance

2021 ◽  
Vol 2021 (4) ◽  
pp. 8-17
Author(s):  
Mokhirbek F. MUKHAMEDZHANOV ◽  
Keyword(s):  
High Speed ◽  
Practical Importance ◽  
Current Collector ◽  
Actual State ◽  
State Monitoring ◽  
Current Collection ◽  
Maintenance Schedule ◽  
Logic Control ◽  
Catenary System ◽  
System Life

Objective: To develop requirements for the organization of maintenance of the catenary system based on the actual state indicated by the digital diagnostic and monitoring platform in the logic control system for high-speed traffic. Methods: An overview analysis of high-speed catenary system diagnostics and monitoring systems is applied. Results: The systems of monitoring and automated control of catenary system devices in high-speed lines have been studied. The analytical findings as regards the maintenance methods according to the preventive maintenance schedule and based on the actual state monitoring data have been presented. Requirements for diagnostic and monitoring devices 15 of the high-speed lines catenary system have been formulated, aimed at improving the quality attributes of current collection. Practical importance: A structural diagram of quality diagnostics and monitoring for the current collection in the high-speed Current Collector–Catenary system was obtained. The design concept of a prin-cipal model of logic control of the catenary system life cycle has been developed

To Achieve the Best Performance Through Optimization of Gas Delivery and Current Collection in Solid Oxide Fuel Cells

2005 ◽  
Vol 3 (2) ◽  
pp. 188-194 ◽  
Author(s):  
P. W. Li ◽  
S. P. Chen ◽  
M. K. Chyu
Keyword(s):  
Fuel Cell ◽  
Contact Resistance ◽  
Solid Oxide Fuel Cell ◽  
Power Density ◽  
Current Collector ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Electrolyte Layer ◽  
Current Collectors ◽  
Current Collection

Aimed at improving the maximum available power density in a planar-type solid oxide fuel cell, an analytical model is proposed in this work to find the optimum size of a current collector that collects the current from a specific active area of the electrode-electrolyte layer. Distributed three-dimensional current collectors in gas delivery field are designated to allow a larger area of the electrode-electrolyte layer to be active for electrochemical reaction compared to conventional designs that gas channels are separated by current collectors. It has been found that the optimal operating temperature of a planar-type solid oxide fuel cell might be around 850°C, if the sizes of the distributed current collectors and their control areas are optimized. Decreasing the size of both the current collector and its control area is advantageous in achieving a higher power density. Studies also show that the optimal sizes of the current collector and the current collection area investigated at 850°C and zero concentration polarization are applicable to situations of different operating temperatures, and different concentration polarizations. The optimization results of the sizes of current collectors and their control areas are relatively sensitive to the contact resistance between the current collectors and the electrodes of the fuel cell. Results of great significance are provided in the analysis, which will help designers to account for the variation of contact resistance in optimization designing of a bipolar plate of fuel cells.

scholarly journals MATHEMATICAL MODELING AND ANALYSIS OF ELECTROMAGNETIC PROCESSES IN THE THYRISTOR CURRENT REGULATOR SYSTEM - SPECIAL TRANSFORMER INSTALLATION INSTALLATION IN BCF

2021 ◽  
Vol 2021 (59) ◽  
pp. 28-35
Author(s):  
P.P. Podeiko ◽  
◽  
V.P. Styazhkin ◽  
Keyword(s):  
Mathematical Modeling ◽  
Load Resistance ◽  
Core Material ◽  
Nonlinear Parameters ◽  
Loop Control ◽  
Modeling And Analysis ◽  
Electromagnetic Processes ◽  
The Difference ◽  
Transformer Core ◽  
Primary Current

Peculiarities of mathematical modeling are considered and electromagnetic processes in the system “thyristor current regulator - special transformer” (TRS-ST) are analyzed. An indirect method for measuring the temperature of a die plate, which is controlled by the primary current of the CT, is proposed. A simulation model of the TRS-ST system has been created, which makes it possible to take into account the nonlinearity of the characteristics of the transformer core material and the nonlinearity of the load resistance to achieve the required accuracy of electromagnetic processes. The results of simulation confirmed the effectiveness of the developed mathematical model as the difference between the curves of transients obtained by modeling and the curves obtained during research on the experimental setup is not more than 5% and allows to further optimize multi-loop control systems with interconnected and nonlinear parameters. Bibl. 9, fig. 13.

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