Magnetic shunt, magnetic shunt arrangement and power device
A technology for power devices and magnetic shunts, applied in magnetic cores/yokes, parts of transformers/inductors, circuits, etc., can solve problems such as reducing the efficiency of power devices and increasing local temperature rise, and achieve improved efficiency and shielding efficiency Enhanced, geometrically simple effects
Inactive Publication Date: 2012-04-04
ABB RES LTD
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Problems solved by technology
These induced eddy currents reduce the efficiency of the electrical installation and further contribute to a possible overheating of the electrical installation, thereby simultaneously increasing the risk of local temperature rises, i.e. the occurrence of so-called hot spots (K. Karsai, D. Kerenyi, L. Kiss, " Large Power Transformers", Elsevier, Amsterdam-Oxford-New York, 1987)
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[0048] Figures 1 to 10 Each depicts in top view an embodiment of a magnetic shunt 1 placed between a ferromagnetic conducting plate 2 (which represents eg a tank wall of a power transformer) and a bus bar 3 . The conductive plate 2 is the object to be magnetically shielded by the magnetic shunt 1 and the bus bars 3 are the source of the magnetic field. Exemplarily, the conductivity σ of the conductive plate 2 is 6.66·10 6 S / m, and the magnetic permeability μ r It is 200. Exemplarily 1000 A RMS phase currents with a frequency of 50 Hz flow through these bus bars 3 .
[0049] The magnetic shunt 1 comprises a bridge 4 and two flux collectors 5 . The bridge 4 connects the two flux collectors 5 . The cross-section of each of these flux collectors 5 is larger than the cross-section of the bridge 4, i.e., at Figures 1 to 10 All magnetic shunts 1 depicted in have non-uniform thickness. The magnetic shunt 1 is symmetrical about an axis of symmetry perpendicular to the conducti...
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Abstract
The invention relates to a magnetic shunt (1) for magnetic shielding of a power device, in particular a power transformer, comprising magnetic flux collectors (5) that are magnetically connected by a magnetically permeable bridge (4, 4.1, 4.2, 4.3), the bridge (4, 4.1, 4.2, 4.3) being arranged between the magnetic flux collectors (5) with one magnetic flux collector (5) being placed at each end of the bridge (4, 4.1, 4.2, 4.3), wherein the cross-section of the magnetic flux collectors (5) is larger than the cross-section of the bridge (4, 4.1, 4.2, 4.3) and the magnetic shunt (1) forms a single structural unit. The invention furthermore relates to magnetic shunt arrangement (12) and a power device which comprise magnetic shunts (1) according to the invention.
Description
technical field [0001] The invention relates to a magnetic shunt for magnetically shielded electrical installations according to the preamble of claim 1, a magnetic shunt arrangement for magnetically shielded electrical installations according to the preamble of claim 8 and Electric device according to the preamble of claim 10 . Background technique [0002] Magnetic shielding (also called magnetic shielding) is used to protect an object having a certain volume (such as an electrical (electrical) device, especially a power transformer, etc.) from magnetic fields such as stray magnetic fields. In order to achieve magnetic shielding / magnetic shielding, there are currently two known technical solutions (Ch. Yongbin, Y. Junyou, Y. Hainian, T. Renyuan, "Study on Eddy Current Losses and Shielding Measures in Large Power Transformers", IEEE Transactions on Magnetics, Vol. 30, No. 5, 1994; K. Karsai, D. Kerenyi, L. Kiss, "Large Power Transformers", Elsevier, Amsterdam-Oxford-New Yo...
Claims
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IPC IPC(8): H01F27/36
CPCH01F27/365H01F3/10H01F27/36H01F27/366
Inventor B·克兰加努克雷图J·斯马吉克H·诺德博格
Owner ABB RES LTD