scholarly journals Control of electromagnetic environment in smart traction power supply systems

2019 ◽  
Vol 91 ◽  
pp. 01009
Author(s):  
Natalya Buyakova ◽  
Vasiliy Zakaryukin ◽  
Andrey Kryukov
Keyword(s):  
Magnetic Field ◽  
Field Strength ◽  
Magnetic Field Strength ◽  
Power Supply ◽  
Electromagnetic Environment ◽  
Traction Network ◽  
Traction Power Supply ◽  
Supply Systems ◽  
The Magnetic Field ◽  
Traction Power

The possibility of reducing the intensity of magnetic field created by a traction network of an alternating current electrified railroad is considered in the article. The electric field of such a traction network at a height of 1,8 m above is relatively small. In order to control the electromagnetic situation, 2x25 kV traction systems, sucking transformers with a return wire for the 25 kV system, amplifying and shielding wires of the traction network, passive screens on passenger platforms, optimization of train traffic schedules can be used. Fazonord software package developed at the Irkutsk State Transport University was used as a tool for the analysis of the above events. Using computer simulations, it was shown that the most effective methods for reducing the magnetic field strength are the use of screens on passenger platforms, optimal train schedules, and the use of “soft” train driving modes. The latter measure is able to reduce the peak magnetic field strength by about 25%.

scholarly journals Electromagnetic safety enhancing in railway electric supply systems

2018 ◽  
Vol 58 ◽  
pp. 03003 ◽  
Author(s):  
Natal’ya Buyakova ◽  
Vasiliy Zakaryukin ◽  
Andrey Kryukov ◽  
Tu Nguyen
Keyword(s):  
Magnetic Field ◽  
Field Strength ◽  
Magnetic Field Strength ◽  
Power Supply ◽  
Simulation Modeling ◽  
Power Networks ◽  
Traction Power Supply ◽  
Supply Systems ◽  
Electric Supply ◽  
Traction Power

The methods of simulation modeling of traction power supply systems is developed, allowing analyzing the electromagnetic safety conditions in complex traction power networks equipped with sucking transformers. The effectiveness of the application of the sucking transformers (ST) connected in the rail cut with a distance of 3 km between transformers is small due to rails’ currents. The sucking transformers with return wires do not have this drawback. The use of ST with a return wire allows significantly improving the electromagnetic safety conditions: the level of magnetic field strength is reduced by tens of percent.

scholarly journals Mathematical modeling of electromagnetic environment at railroad junctions

2019 ◽  
Vol 91 ◽  
pp. 01010
Author(s):  
Natalya Buyakova ◽  
Vasiliy Zakaryukin ◽  
Andrey Kryukov
Keyword(s):  
Magnetic Field ◽  
Field Strength ◽  
Magnetic Field Strength ◽  
Field Distribution ◽  
Rolling Stock ◽  
Electromagnetic Environment ◽  
Environment Modeling ◽  
Underground Pipelines ◽  
Magnetic Strength ◽  
The Magnetic Field

Results of computer-aided studies of electromagnetic environment at railroad junctions of alternating current electrified railroads having voltage of 25 kV are presented. A large number of lines and overhead catenaries significantly complicate the picture of electromagnetic field distribution. The nature of the field distribution in space is significantly affected by the rolling stock on station tracks. Besides, the task of electromagnetic environment modeling is complicated by the presence of underground pipelines and enclosures, and reinforced concrete passenger platforms. During the transfer of power of 10 + j10 MV·A through the junction of overhead system, the magnetic field strength at a level of 1,8 m is considerably less than the magnetic strength at a railway haul due to current distribution on overhead system of several tracks. Magnetic field strength levels in calculation examples do not exceed amplitude of 30 A/m. The train performance leads to changes in the strengths of the electrical and magnetic fields. The dynamics of changes is presented as a result of simulation modeling of train movement modes.

scholarly journals MODELING TRACTION NETWORKS WHEN PASSING HEAVY TRAINS

2020 ◽  
Vol 2020 (1) ◽  
pp. 207-208
Author(s):  
Andrey Kryukov ◽  
Evgeniy Bezridnyy
Keyword(s):  
Power Supply ◽  
Power Supply System ◽  
Harmonic Distortion ◽  
Current Collectors ◽  
Traction Network ◽  
External Power ◽  
Traction Power Supply ◽  
Supply Systems ◽  
Computer Studies ◽  
Traction Power

The results of computer studies of the modes of traction power supply systems when passing trains weighing 12,000 tons are presented. The parameters are compared with the situation when trains are moving weighing 3,000 tons. It is shown that increasing the mass of trains with the same traffic volume leads to an increase in currents in the traction network, a decrease in voltage at the current collectors, the growth of asymmetry and harmonic distortion in the external power supply system

Improvement of External and Traction Power Supply System’s Efficiency by Normalizing the Schemes

2021 ◽  
Vol 64 (4-5) ◽  
pp. 72-78
Author(s):  
Nikolai Grigoriev ◽  
◽  
Ivan Ignatenko ◽  
Vladimir Kovalev ◽  
Polina Trofimovich ◽  
...  
Keyword(s):  
Transmission Line ◽  
Power Supply ◽  
Power Transmission ◽  
Power Transmission Line ◽  
Electric Transmission ◽  
Traction Network ◽  
Traction Substations ◽  
Traction Power Supply ◽  
Supply Systems ◽  
Traction Power

The article deals with improvement off the efficiency of external and traction power supply systems using for example indicators of traction substations for a real electric transmission line segment of a traction network of 25 kV. The analysis of the functioning of a real section of electrified railways with traction substations, two of which are connected according to the "feeding" scheme is providing in the article. The currents in the wind-ings of traction transformers are calculate for these substations. The proportion of the currents values of the most loaded winding to the two less loaded is 2: 1. The coefficient asymmetry of currents of transformer wind-ings operating on existing traction substations is equal to 1. The results prove a significant currents asymmetry of transformers windings and phases of electric transmission lines which leads to an increasing voltage unbal-ance. New schemes for connecting traction substations for the considered section of electrified railways have been developed in order to improve the quality indicators of electrical energy. New connection schemes for three traction substations, determined according to the requirements for connecting to the external and trac-tion power supply system are presents in the article. The calculation for new schemes of connecting traction substations, similar to the previously considered option, has been performed. The values of winding currents, power transmission line phases and coefficient asymmetry were obtained for new substation connection schemes. The proposed schemes for connecting traction substations provide a decrease in the coefficient asym-metry of the winding currents from 1 to 0.5 and a decrease in the current modulus in the most loaded windings by 1.5 times. New schemes for connecting traction substations reduce the currents of the most loaded windings and phases of the power transmission line, as well as the asymmetry of currents, which ensures an improvement in the efficiency of the external and traction power supply systems of the real traction network.

scholarly journals ELECTROMAGNETIC INFLUENCE OF TRACTION NETWORKS 94 kV ON PIPELINES

2020 ◽  
Vol 2020 (1) ◽  
pp. 223-224
Author(s):  
Aleksandr Kryukov ◽  
Aleksandr Cherepanov
Keyword(s):  
Power Supply ◽  
Oil And Gas ◽  
Induced Voltage ◽  
Railway Line ◽  
The Earth ◽  
Traction Network ◽  
Main Pipelines ◽  
Traction Power Supply ◽  
Supply Systems ◽  
Traction Power

Steel pipelines for transporting oil and gas can run along the routes of AC main railways. As a result of the electromagnetic influence of traction networks on pipes having insulating coatings, voltages can be induced that are hazardous to personnel who operate the pipeline. The report addressed the issues of modeling the electromagnetic effects of a promising traction network of 94 kV on a steel pipeline with a diameter of 250 mm laid on the surface of the earth. Computer simulation showed that at a distance of 100 meters from the railway line to the pipeline, the maximum induced voltage reaches 100 V, which is more than one and a half times the permissible value. This factor must be taken into account when designing prospective traction power supply systems in the areas of their convergence with main pipelines

scholarly journals Electromagnetic safety of high voltage traction networks

2019 ◽  
Vol 139 ◽  
pp. 01067
Author(s):  
Natalya Buyakova ◽  
Vasilij Zakaryukin ◽  
Andrey Kryukov
Keyword(s):  
Magnetic Field ◽  
High Voltage ◽  
Power Supply ◽  
Simulation Modeling ◽  
Ground Surface ◽  
Software Application ◽  
Traction Power Supply ◽  
Traction System ◽  
Supply Systems ◽  
Traction Power

The article provides procedure for simulation modeling of traction power supply systems which allows analyzing electromagnetic safety conditions in perspective high voltage traction net- works. Modeling of electromagnetic fields in the Fazonord software application proved that 50 kV traction system is characterized by the highest electromagnetic strength at a height of 1.8 m above the ground surface, while 2x25 kV system is characterized by the lowest one. Traditional traction system with 27.5 kV voltage is the worst in terms of magnetic field strength, while 2x50 kV is the best; auto- transformer systems of traction power supply create magnetic fields due to demagnetizing effect of power leads.

On the Configuration of the Magnetic Field of β CrB

1976 ◽  
Vol 32 ◽  
pp. 613-622
Author(s):  
I.A. Aslanov ◽  
Yu.S. Rustamov
Keyword(s):  
Magnetic Field ◽  
Field Strength ◽  
Radial Velocity ◽  
Magnetic Field Strength ◽  
Complex Shape ◽  
Rotation Period ◽  
Field Variation ◽  
Magnetic Field Variation ◽  
Secular Variations ◽  
The Magnetic Field

SummaryMeasurements of the radial velocities and magnetic field strength of β CrB were carried out. It is shown that there is a variability with the rotation period different for various elements. The curve of the magnetic field variation measured from lines of 5 different elements: FeI, CrI, CrII, TiII, ScII and CaI has a complex shape specific for each element. This may be due to the presence of magnetic spots on the stellar surface. A comparison with the radial velocity curves suggests the presence of a least 4 spots of Ti and Cr coinciding with magnetic spots. A change of the magnetic field with optical depth is shown. The curve of the Heffvariation with the rotation period is given. A possibility of secular variations of the magnetic field is shown.

scholarly journals The effects of magnetic field strength on the properties of wind generated from hot accretion flow

2018 ◽  
Vol 615 ◽  
pp. A35 ◽  
Author(s):  
De-Fu Bu ◽  
Amin Mosallanezhad
Keyword(s):  
Magnetic Field ◽  
Field Strength ◽  
Pressure Gradient ◽  
Magnetic Field Strength ◽  
Magnetic Pressure ◽  
Gas Pressure ◽  
Accretion Flow ◽  
Accretion Flows ◽  
Black Hole Accretion ◽  
The Magnetic Field

Context. Observations indicate that wind can be generated in hot accretion flow. Wind generated from weakly magnetized accretion flow has been studied. However, the properties of wind generated from strongly magnetized hot accretion flow have not been studied. Aims. In this paper, we study the properties of wind generated from both weakly and strongly magnetized accretion flow. We focus on how the magnetic field strength affects the wind properties. Methods. We solve steady-state two-dimensional magnetohydrodynamic equations of black hole accretion in the presence of a largescale magnetic field. We assume self-similarity in radial direction. The magnetic field is assumed to be evenly symmetric with the equatorial plane. Results. We find that wind exists in both weakly and strongly magnetized accretion flows. When the magnetic field is weak (magnetic pressure is more than two orders of magnitude smaller than gas pressure), wind is driven by gas pressure gradient and centrifugal forces. When the magnetic field is strong (magnetic pressure is slightly smaller than gas pressure), wind is driven by gas pressure gradient and magnetic pressure gradient forces. The power of wind in the strongly magnetized case is just slightly larger than that in the weakly magnetized case. The power of wind lies in a range PW ~ 10−4–10−3 Ṁinc2, with Ṁin and c being mass inflow rate and speed of light, respectively. The possible role of wind in active galactic nuclei feedback is briefly discussed.

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