ELECTROMAGNETIC SHIELD FOR USE IN A POWER SYSTEM

• US 20180054114A1
• Filed: 11/05/2014
• Published: 02/22/2018
• Est. Priority Date: 11/05/2014
• Status: Active Grant

• Current Assignee: Hitachi Energy Limited
• Original Assignee: ABB Schweiz AG (ABB Limited)
• Inventors: Wu, Dong, Ni, Jing, Arevalo, Liliana, Montano, Raul
• Granted Patent: US 10,243,452 B2
• Time in Patent Office: Days
• CPC Class Codes: H02J 3/36 Arrangements for transfer of electric power between ac networks via a high-tension dc link
• CPC Class Codes: H02M 1/44 Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
• CPC Class Codes: H05K 7/1432 specially adapted for power drive units or power converters
• CPC Class Codes: H05K 7/14339 specially adapted for high voltage operation
• CPC Class Codes: H05K 9/0007 Casings standardised racks H05K9/0062
• CPC Class Codes: H05K 9/0049 being metallic containers
• CPC Class Codes: Y02E 60/60 Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]

Abstract

An electromagnetic shield including a base portion and opposing recess walls extending from the base portion at an angle with respect to a plane in which the base portion extends, so as to, together with the base portion, define a recess. At least one recess wall may be arranged such that it has a distal edge with respect to the base portion, wherein the distal edge includes a cylindrical portion. In alternative or in addition, at least one recess wall may be arranged such that at least a portion thereof curves outwards or inwards with respect to the recess.

Claims

1. An electromagnetic shield for use in a power system for electromagnetically shielding at least one electrically conductive element included in the power system, which at least one electrically conductive element when energized generates an electric field around the at least one electrically conductive element, the electromagnetic shield comprising:

a base portion; and

opposing recess walls extending from the base portion at an angle with respect to a plane in which the base portion extends, so as to, together with the base portion, define a recess having a shape of a depression in the electromagnetic shield;

wherein at least one recess wall is arranged such that it has a distal edge with respect to the base portion, wherein the distal edge comprises a cylindrical portion.

2. The electromagnetic shield according to claim 1, wherein the cylindrical portion defines a distal end of the at least one recess wall with respect to the base portion.

3. The electromagnetic shield according to claim 1, wherein the cylindrical portion extends along substantially the entire length of the distal edge.

4. The electromagnetic shield according to claim 1, wherein the cylindrical portion constitutes an end of the at least one recess wall or the distal edge.

5. The electromagnetic shield according to claim 1, wherein the cylindrical portion has a substantially circular cross section in a direction parallel with an axial extension.

6. The electromagnetic shield according to claim 1, wherein the at least one recess wall and the cylindrical portion are integrally arranged with respect to each other.

7. The electromagnetic shield according to claim 1, wherein at least one recess wall is arranged such that at least a portion thereof curves outwards or inwards with respect to the recess.

8. The electromagnetic shield according to claim 7, wherein the at least one recess wall, which is arranged such that at least a portion thereof curves outwards or inwards with respect to the recess, has a cross section in a direction perpendicular to a transverse direction of the at least one recess wall which has a rounded shape, a shape of a section of an oval, or a shape of a section of a circle.

9. The electromagnetic shield according to claim 8, wherein the section of a circle is larger than a quarter of a circle.

10. The electromagnetic shield according to claim 7, wherein the at least one recess wall, which is arranged such that at least a portion thereof curves outwards or inwards with respect to the recess, defines an elongated side wall of the recess.

11. The electromagnetic shield according to claim 1, wherein the recess walls are arranged such that they include corners which curve outwards or inwards with respect to the recess.

12. The electromagnetic shield according to claim 11, wherein the corners have a rounded, semioval or a semispherical shape.

13. The electromagnetic shield according to claim 1, wherein the recess walls are integrally arranged with respect to each other.

14. The electromagnetic shield according to claim 1, wherein the base portion and the recess walls are integrally arranged with respect to each other.

15. The electromagnetic shield according to claim 1, wherein the base portion is substantially planar.

16. A power converter assembly comprising at least one electromagnetic shield according to claim 1 for electromagnetically shielding at least one electrically conductive element of the power converter assembly, which at least one electrically conductive element when energized generates an electric field around the at least one electrically conductive element.

17. The power system comprising at least one electrically conductive element, which when energized generates an electric field around the at least one electrically conductive element, and an electromagnetic shield according to claim 1 for electromagnetically shielding the at least one electrically conductive element.

18. The electromagnetic shield according to claim 2, wherein the cylindrical portion extends along substantially the entire length of the distal edge.