Compact vacuum interrupter

Patent metadata

Field	Value
Publication number	US-12362114-B2
Application number	US-202118029256-A
Country	US
Kind code	B2
Filing date	Sep 13, 2021
Priority date	Sep 30, 2020
Publication date	Jul 15, 2025
Grant date	Jul 15, 2025

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.

First claim

The invention claimed is:

1. 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;
said movable-contact rod having a given diameter and being formed with a narrowing, in a first movable-contact rod region, with said narrowing having a reduced diameter reducing the given diameter of said movable-contact rod by 5% to 25%.

2. The compact vacuum interrupter according to claim 1 , 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.

3. The compact vacuum interrupter according to claim 2 , 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.

4. The compact vacuum interrupter according to claim 2 , wherein said third material is copper or a copper alloy.

5. The compact vacuum interrupter according to claim 4 , wherein said third material is a copper alloy made with at least one material selected from the group consisting of tungsten, chromium, and carbon.

6. The compact vacuum interrupter according to claim 1 , wherein said second material is copper or a copper alloy.

7. The compact vacuum interrupter according to claim 1 , wherein said first material is a chromium-nickel alloy or a steel alloy.

8. The compact vacuum interrupter according to claim 7 , wherein said first material is a stainless steel alloy.

9. The compact vacuum interrupter according to claim 1 , wherein said narrowing reduces the given diameter of said movable-contact rod by 10% to 20%.

10. The compact vacuum interrupter according to claim 1 , 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.

11. The compact vacuum interrupter according to claim 1 , which comprises two or more shield elements arranged between said insulator element and said first movable-contact rod region.

12. 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; and
said movable-contact rod having a given diameter and said movable-contact rod being formed with a narrowing, in a first movable-contact rod region, with a reduced diameter, and wherein said narrowing reduces the given diameter of said movable-contact rod by 5% to 25%.

13. The switchgear according to claim 12 , wherein said compact vacuum interrupter is arranged in a secondary current path and is configured to switch off rated currents.

14. The switchgear according to claim 12 , wherein one or more of said compact vacuum interrupters are arranged in a tap changer.

Assignees

• Siemens Ag

Inventors

• Graskowski Frank
• Schümann Ulf
• Ziefle Alexander

Classifications

• H01H9/0038

  making use of vacuum switches · CPC title

• H01H1/04 Primary

  Co-operating contacts of different material · CPC title

• H01H1/0203

  specially adapted for vacuum switches · CPC title

• H01H33/121

  Load break switches · CPC title

• H01H33/6661

  Combination with other type of switch, e.g. for load break switches (H01H33/143, H01H33/6662 take precedence) · CPC title