scholarly journals MAGNETIC FIELD SHIELDING OF UNDERGROUND POWER CABLE LINE BY H-SHAPED SHIELD

2020 ◽  
Vol 2020 (6) ◽  
pp. 15-20
Author(s):  
I.M. Kucheriava ◽  
Keyword(s):  
Magnetic Field ◽  
Low Carbon Steel ◽  
Power Cable ◽  
Low Carbon ◽  
Shielding Effectiveness ◽  
Cable Line ◽  
Three Phase ◽  
Underground Power Cable ◽  
Extra High Voltage ◽  
The Magnetic Field

In the article the magnetic field distributions, generated by underground extra-high voltage (330 kV) three-phase power cable line in the environment, in particular near the cables in the trench and on the ground, are analyzed for using of H-shaped shield made of different materials including aluminum, low carbon steel and non-oriented grain steel. As shown, the best shielding effectiveness is realized by aluminium shield. The H-shaped shield made of high-conducting non-magnetic materials is proposed to use in order to mitigate the magnetic field level on the ground down to regulated nonhazardous values. References 14, figures 7.

Innovative calculation methods of the magnetic field from single and double-circuit twisted three-phase cables widely used in MV and LV installations

2012 ◽  
Vol 2 (2) ◽  
Author(s):  
Giovanni Mazzanti ◽  
Marco Landini ◽  
Effrosyni Kandia ◽  
Cesare Biserni ◽  
Massimo Marzinotto
Keyword(s):  
Magnetic Field ◽  
Power Distribution ◽  
Approximate Expression ◽  
Power Cable ◽  
Cable Line ◽  
Worst Case ◽  
Medium Voltage ◽  
Three Phase ◽  
Worst Case Approach ◽  
The Magnetic Field

AbstractThis paper proposes a simple innovative formula for the calculation of the magnetic field generated by a single and a double circuit twisted three-phase power cable line. The formula results a good approximation of the rigorous analytical one and at the same time is much more accurate than the approximated formula found in literature, as demonstrated by some cases of a twisted three-phase power cable used for power distribution at the medium voltage level. The effectiveness of this simple innovative formula is also examined in the case of a double-circuit twisted three-phase power cable line following the’ worst case’ approach and concluding at proposing an approximate expression for the total magnetic field generated by both twisted three-phase power cables.

Microstructure and Properties under Alternating Magnetism after Hot Rolling

2014 ◽  
Vol 1004-1005 ◽  
pp. 1256-1259
Author(s):  
Shen Bai Zheng ◽  
Shi Jie Liu ◽  
Hong Bin Li ◽  
Bin Feng ◽  
Xue Song Hui
Keyword(s):  
Magnetic Field ◽  
Carbon Steel ◽  
Cold Rolling ◽  
Grain Growth ◽  
Hot Rolling ◽  
Magnetic Field Intensity ◽  
Raw Materials ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
The Magnetic Field

The austenite steel after rolling was radiated by the alternating magnetism, and the effects that alternating magnetic on the austenite transition was studied. The result shows that the alternating magnetism promotes the austenitic grain growth of low carbon steel. If the magnetic field intensity is increased, it could provide better performance of raw materials to cold rolling processing.

Microstructures and Properties of Co-Based Alloy Surfacing Layer with Longitudinal Magnetic Field

2010 ◽  
Vol 154-155 ◽  
pp. 1271-1274
Author(s):  
Yun Hai Su ◽  
Zheng Jun Liu ◽  
Ming Su
Keyword(s):  
Magnetic Field ◽  
Wear Resistance ◽  
Longitudinal Magnetic Field ◽  
Low Carbon Steel ◽  
Xrd Analysis ◽  
Wear Loss ◽  
Low Carbon ◽  
Dc Magnetic Field ◽  
Optimal Values ◽  
The Magnetic Field

In order to systematically study the influence of surfacing current and magnetic field current on hardness and wear resistance of surfacing layer, longitudinal DC magnetic field was applied during plasma arc surfacing Co-based alloy on low-carbon steel. The hardness, wear resistance, microstructure and phase constitution of the surfacing layer were investigated through the tests of hardness, wear, SEM and XRD analysis. The results show that the surfacing current and magnetic field current must be matched properly to achieve the optimal properties of surfacing layer. The optimal values are obtained when the surfacing current is 160A and the magnetic field current is 3A, where the hardness is 43.7 HRC and the wear loss is 0.5493g. The proper electromagnetic stirring induced by electromagnetic field can not only refine the microstructure but also improve the hardness and wear resistance of the surfacing layer.

scholarly journals THE DISTRIBUTION OF MAGNETIC AND THERMAL FIELDS, POWER LOSSES IN ELECTROMAGNETIC SHIELD OF UNDERGROUND TWO-CIRCUIT CABLE LINE

2021 ◽  
Vol 2021 (60) ◽  
pp. 12-21
Author(s):  
I.M. Kucheriava ◽  
Keyword(s):  
Maximum Temperature ◽  
Power Cable ◽  
Cable Line ◽  
Thermal Fields ◽  
Operating Current ◽  
Electromagnetic Shield ◽  
Electromagnetic Characteristics ◽  
Extra High Voltage ◽  
The Magnetic Field ◽  
Lower Heating

In the article, the magnetic and thermal field distributions generated by underground two-circuit extra-high voltage power cable line in the environment, particularly near the cables and flat aluminum shield, which is located at a different distance from the cables and has different thicknesses, are analyzed. The unique features of the magnetic field and temperature distributions inside the shield are computed and studied. For the cases under consideration, the Joule losses in the external shield do not exceed 3% of the losses in the cables. The primary electromagnetic characteristics are compared for the aluminum shield (shielding efficiency is 1,94) and the shield with lower conductivity (shielding efficiency is equal to 1,2). As shown, the thicker shield helps to increase the ampacity of the cable line owing to lower heating. The actual operating current of the cable line under consideration depends on the distance of the shield from the cables owing to the relation between their maximum temperature and this distance. Ref. 15, fig. 7, table.

Effect of Austenite Transition under Pulsating Magnetism

2013 ◽  
Vol 634-638 ◽  
pp. 1704-1707
Author(s):  
Shen Bai Zheng ◽  
Shao Hui Pan ◽  
Hui Wen ◽  
Xiaog Xiong Wang
Keyword(s):  
Magnetic Field ◽  
Carbon Steel ◽  
Cold Rolling ◽  
Grain Growth ◽  
Magnetic Field Intensity ◽  
Raw Materials ◽  
Low Carbon Steel ◽  
Intermediate Frequency ◽  
Low Carbon ◽  
The Magnetic Field

The austenite steel was radiated by the intermediate frequency pulsating magnetism, and the effects that pulsating magnetic on the austenite transition was studied. The result shows that the pulsating magnetism promotes the austenitic grain growth of low carbon steel. If the magnetic field intensity is increased, it could provide better performance of raw materials to cold rolling processing.

scholarly journals Arc Characteristics and Welding Process of Magnetic Field Assisting Plasma-GMAW-P

2021 ◽  
Vol 100 (01) ◽  
pp. 1-12
Author(s):  
JIANG YU ◽  
◽  
HONGTAO ZHANG ◽  
PENG HE ◽  
XIAO YANG ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Gas Flow ◽  
Gas Metal Arc Welding ◽  
Low Carbon Steel ◽  
Welding Process ◽  
Welding Current ◽  
Electrical Signal ◽  
Maximum Temperature ◽  
Low Carbon ◽  
The Magnetic Field

Low-carbon steel Q235B was successfully joined by plasma-pulsed gas metal arc welding (plasma-GMAW-P) with an external magnetic field. The arc profile, temperature field, electrical signal, microstructure, and mechanical properties of this method were analyzed. The results indicated that the coupling degree of the two arcs increased with the strengthening of the magnetic field current. However, when the magnetic field current was greater than 1 A, the arc pro-file changed slightly with the increase of the magnetic field current. Fixed on the magnetic field current, the coupling degree first increased and then decreased with the increase of the plasma welding current, GMAW-P welding current, plasma gas flow rate, and nozzle height, respectively. The maximum temperature had no obvious influence on joint penetration at different magnetic field cur-rents. However, the average temperature had an inverse effect on joint penetration at different magnetic field currents. The weld fusion zone joint tensile test results showed that the ratio of depth to width increased with the application of magnetic field currents. Moreover, tensile strength on the upper and lower part of the tensile samples were 521 and 488 MPa, respectively, which were 4.6% and 3.2% higher than those without the magnetic field. The microhardness of the weld joints was higher than that without the magnetic field.

scholarly journals Evaluation of the magnetic field generated by a power cable in proximity of a joint bay: Comparison between two different approaches

2021 ◽  
Vol 34 (4) ◽  
pp. 511-524
Author(s):  
Giovanni Lucca
Keyword(s):  
Magnetic Field ◽  
Density Field ◽  
Magnetic Flux Density ◽  
Power Cable ◽  
National Authority ◽  
Frequency Magnetic Field ◽  
Power Frequency ◽  
Underground Power Cable ◽  
Actual Geometry ◽  
The Magnetic Field

The paper presents two different approaches for the evaluation of the magnetic flux density field produced by an underground power cable in proximity of areas where joint bays are present; as known, in those areas the field levels are generally much higher compared to the ones generated along the ordinary route. The first and more rigorous 3D approach takes into account the actual geometry of the power cable conductors in the joint bay, while the second one is based on a simplified 2D approach. The main result of the comparison is that the 2D approach, even at short lateral distances from the cable overestimates the field; therefore, one could adopt this method in order to rapidly and conservatively evaluate the distance of compliance (established by each specific national authority) from the cable in order to ensure protection of population from exposure to power frequency magnetic field.

scholarly journals PARTICULARITIES OF MAGNETIC FIELD SHIELDING FOR UNDERGROUND CABLE LINE BY COMPOSITE FILL-UP SOIL WITH MAGNETIC PROPERTIES

2021 ◽  
Vol 2021 (58) ◽  
pp. 14-22
Author(s):  
I.M. Kucheriava ◽  
Keyword(s):  
Magnetic Field ◽  
Magnetic Properties ◽  
Three Dimensional ◽  
3D Models ◽  
Power Cable ◽  
Appreciable Effect ◽  
Cable Line ◽  
Small Height ◽  
Underground Power Cable ◽  
Cable Lines

The computations of the magnetic field generated by high-voltage (330 kV) underground power cable line with special fill-up soil having different dimensions (bulk) are carried out by the two- and three-dimensional computer models. The supplementary soil above the cables is the composite material with effective magnetic properties and serves as a magnetic shield. The computer results obtained by 2D and 3D models are compared. The efficiency of magnetic field shielding depending on the magnetic permeability, width, and height of the fill-up soil is studied. As revealed, there is the optimal small soil height for the best magnetic field mitigation on the top of the ground directly over the cable line. In addition, the width of the magnetic soil has an appreciable effect on shielding efficiency. The shielding of underground single-circuit three-phase power cable lines is efficient only when using the magnetic fill-up soil (or ordinary external screen made of magnetic materials) with enough small height. References 14, figures 7.

scholarly journals STUDY OF THE MAGNETIC FIELD OF THREE PHASE LINES OF SINGLE CORE POWER CABLES WITH TWO-END BONDING OF THEIR SHIELDS

2015 ◽  
Vol 0 (4) ◽  
pp. 56-61 ◽  
Author(s):  
V. Yu. Rozov ◽  
A. A. Kvytsynskyi ◽  
P. N. Dobrodeyev ◽  
V. S. Grinchenko ◽  
A. V. Erisov ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Power Cables ◽  
Three Phase ◽  
The Magnetic Field
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