COMPACT VACUUM INTERRUPTER

Abstract

A compact vacuum interrupter has an insulator element, a moving contact connection, a fixed contact connection, a moving contact, and a fixed contact. The moving contact has a moving contact rod and a moving-contact contact element. The fixed contact has a fixed contact rod and a fixed-contact contact element. The moving contact is formed with a material that is mechanically stronger than a material of the fixed contact.

Claims

1-14. (canceled)

15. A compact vacuum interrupter, comprising: an insulator element, a movable-contact connection, a movable contact, a fixed-contact connection, and a fixed contact; said movable contact having a movable-contact rod and a movable-contact contact element; said fixed contact having a fixed-contact rod and a fixed-contact contact element; said movable contact being formed with a first material and said fixed contact being formed with a second material, wherein said first material is mechanically stronger than said second material.

16. The compact vacuum interrupter according to claim 15, wherein: said movable-contact rod is made with said first material and said fixed-contact rod is made with said second material; said movable-contact contact element and said fixed-contact contact element are made from a third material; and said first material is mechanically stronger than said second material and said third material is a material that is optimized in terms of properties under arc conditions.

17. The compact vacuum interrupter according to claim 16, wherein said first material is a chromium-nickel alloy or a steel alloy, said second material is copper or a copper alloy, and said third material is copper or a copper alloy.

18. The compact vacuum interrupter according to claim 15, wherein said second material is copper or a copper alloy.

19. The compact vacuum interrupter according to claim 15, wherein said first material is a chromium-nickel alloy or a steel alloy.

20. The compact vacuum interrupter according to claim 19, wherein said first material is a stainless steel alloy.

21. The compact vacuum interrupter according to claim 16, wherein said third material is copper or a copper alloy.

22. The compact vacuum interrupter according to claim 21, wherein said third material is a copper alloy made with at least one material selected from the group consisting of tungsten, chromium, and carbon.

23. The compact vacuum interrupter according to claim 15, wherein said movable-contact rod has a given diameter and said movable-contact rod is formed with a narrowing, in a first movable-contact rod region, with a reduced diameter.

24. The compact vacuum interrupter according to claim 23, wherein said narrowing reduces the given diameter of said movable-contact rod by 5% to 25%.

25. The compact vacuum interrupter according to claim 23, wherein said narrowing reduces the given diameter of said movable-contact rod by 10% to 20%.

26. The compact vacuum interrupter according to claim 23, wherein said first movable-contact rod region with said narrowing is arranged in the compact vacuum interrupter to locate said first movable-contact rod region within said insulator element.

27. The compact vacuum interrupter according to claim 23, which comprises two or more shield elements arranged between said insulator element and said first movable-contact rod region.

28. A switchgear, comprising a compact vacuum interrupter having: an insulator element, a movable-contact connection, a movable contact, a fixed-contact connection, and a fixed contact; said movable contact having a movable-contact rod and a movable-contact contact element; said fixed contact having a fixed-contact rod and a fixed-contact contact element; said movable contact being formed of a first material and said fixed contact being formed of a second material, wherein said first material is mechanically stronger than said second material.

29. The switchgear according to claim 28, wherein said compact vacuum interrupter is arranged in a secondary current path and is configured to switch off rated currents.

30. The switchgear according to claim 28, wherein one or more of said compact vacuum interrupters are arranged in a tap changer.

Description

[0025] The invention will be explained by way of example below with reference to figures.

[0026] FIG. 1: shows a schematic sectional illustration of a vacuum interrupter from the prior art;

[0027] FIG. 2: shows a schematic sectional illustration of a vacuum interrupter according to the invention.

[0028] FIG. 1 shows a schematic sectional illustration of a vacuum interrupter 2 from the prior art. The vacuum interrupter 2 has an insulator 10, on which a movable contact 40 is arranged via a bellows 25 and a movable-contact connection 20. The fixed contact 50 is arranged on the other side of the insulator 10 via a fixed-contact connection 30. The movable contact consists of a movable-contact rod 410 and a movable-contact contact element 420. The fixed contact consists of a fixed-contact rod 510 and a fixed-contact contact element 520.

[0029] FIG. 2 shows a schematic sectional illustration of a compact vacuum interrupter 1 according to the invention. The compact vacuum interrupter 1 has an insulator 10, on which a movable contact 40 is arranged via a bellows 25 and a movable-contact connection 20. The fixed contact 50 is arranged on the other side of the insulator 10 via a fixed-contact connection 30. The movable contact consists of a movable-contact rod 410 and a movable-contact contact element 420. The fixed contact consists of a fixed-contact rod 510 and a fixed-contact contact element 520. In the preferred embodiment shown here, the movable-contact rod 410 consists of a first material which is mechanically stronger than the second material of the fixed contact 50.

[0030] In the embodiment shown here, a respective metal connecting piece, which can vary in terms of shape and length, is arranged between the insulator 10 and the fixed-contact connection 30 and between the insulator 10 and the movable-contact connection 20.

[0031] Furthermore, the preferred embodiment shown here additionally has a narrowing of the movable-contact rod 410 in a first movable-contact rod region 415, in which the diameter 412 of the preferably cylindrical movable-contact rod 410 is reduced, in particular by 5% to 25%, particularly preferably 10% to 20%.

[0032] This narrowing makes it possible to reduce the diameter of the insulator 10 further, in particular to reduce it further than selecting the first material as mechanically stronger than the second material alone would. Furthermore, in spite of the reduced diameter of the insulator, it is possible to arrange shields 412 between the insulator 10 and the movable-contact rod 410.

TABLE-US-00001 List of Reference Signs 1 Compact vacuum interrupter; 2 Vacuum interrupter; 10 Insulator; 12 Shield elements; 20 Movable-contact connection; 25 Bellows of the movable-contact connection 20; 30 Fixed-contact connection; 40 Movable contact; 50 Fixed contact; 410 Movable-contact rod; 412 Diameter of the movable-contact rod 410; 415 First movable-contact rod region; 420 Movable-contact contact element; 510 Fixed-contact rod; 520 Fixed-contact contact element.