Medium voltage circuit breaker switching pole

Patent metadata

Field	Value
Publication number	US-12087526-B2
Application number	US-202117556190-A
Country	US
Kind code	B2
Filing date	Dec 20, 2021
Priority date	Jun 21, 2019
Publication date	Sep 10, 2024
Grant date	Sep 10, 2024

Abstract

A medium voltage circuit breaker switching pole includes: a fixed contact of a vacuum interrupter; a movable contact of the interrupter; and a threaded drive element. The movable contact moves along a longitudinal axis of the interrupter. A center axis of the drive element is parallel to the longitudinal axis of the interrupter. When in an open configuration the fixed contact and movable contact are separated from one another. When in a closed configuration the fixed contact and movable contact are in contact with one another. Rotation of the drive element about its center axis in a first direction is transitions the switching pole from the open configuration to the closed configuration. Rotation of the drive element about its center axis in a second direction counter to the first direction transitions the switching pole from the closed configuration to the open configuration.

First claim

What is claimed is:

1. A medium voltage circuit breaker switching pole, comprising:
a fixed contact of a vacuum interrupter;
a movable contact of the vacuum interrupter; and
a threaded drive element,
wherein:
the movable contact is configured to move along a longitudinal axis of the vacuum interrupter,
a center axis of the threaded drive element is parallel to the longitudinal axis of the vacuum interrupter,
when in an open configuration the fixed contact and the movable contact are separated from one another,
when in a closed configuration the fixed contact and the movable contact are in contact with one another,
the switching pole further comprises a threaded pushrod connected to the movable contact,
a thread of the threaded pushrod is configured to engage with a thread of the threaded drive element,
rotations of the threaded drive element are configured to move the threaded pushrod along the center axis of the threaded drive element, and wherein the threaded pushrod is configured not to rotate as the threaded drive element rotates,
an outer surface of the threaded pushrod comprises a groove extending in an axial direction of the threaded pushrod,
the groove is configured to engage with a fixed pin such that axial movement of the threaded pushrod leads to the fixed pin moving within the groove,
rotation of the threaded drive element about the center axis of the threaded drive element in a first direction is configured to transition the switching pole from the open configuration to the closed configuration, and
rotation of the threaded drive element about the center axis in a second direction counter to the first direction is configured to transition the switching pole from the closed configuration to the open configuration.

2. The medium voltage circuit breaker switching pole according to claim 1 , wherein the center axis of the threaded drive element is aligned along the longitudinal axis of the vacuum interrupter.

3. The medium voltage circuit breaker switching pole according to claim 1 , wherein:
the rotation of the threaded drive element about the center axis in the first direction through a rotational angle of less than or equal to 360 degrees is configured to transition the switching pole from the open configuration to the closed configuration, and
the rotation of the threaded drive element about the center axis in the second direction through a rotational angle of less than or equal to 360 degrees is configured to transition the switching pole from the closed configuration to the open configuration.

4. The medium voltage circuit breaker switching pole according to claim 1 , wherein an end of the threaded drive element distal to the movable contact comprises a ball bearing configured to rotate in a ball bearing socket or an inclined ball bearing.

5. The medium voltage circuit breaker switching pole according to claim 4 , wherein the ball bearing and/or the ball bearing socket comprise a low friction surface material.

6. The medium voltage circuit breaker switching pole according to claim 1 , wherein:
the threaded pushrod is movable connected to the movable contact, and
a contact pressure spring is configured to move the moveable contact relative to the threaded pushrod.

7. The medium voltage circuit breaker switching pole according to claim 1 , wherein the threaded pushrod comprises an insulating material.

8. The medium voltage circuit breaker switching pole according to claim 1 , wherein:
the threaded drive element comprises a coupling,
the coupling is configured to engage with a gear wheel or belt associated with a drive motor, and
rotational movement of the coupling is configured to lead to an associated and equivalent rotational movement of the threaded drive element.

9. A medium voltage switching system, comprising:
a first medium voltage circuit breaker switching pole according to claim 1 ;
a second medium voltage circuit breaker switching pole according to claim 1 ;
a third medium voltage circuit breaker switching pole according to claim 1 ,
wherein the first, second, and third circuit breaker switching poles are configured to be driven by a single motor such that simultaneous rotation of each threaded drive of each switching pole is configured to transition each switching pole from the open configuration to the closed configuration.

10. The medium voltage switching system according to claim 9 , wherein rotation of the threaded drive element of each switching pole in a first direction is configured to transition each switching pole from the open configuration to the closed configuration.

11. The medium voltage switching system according to claim 9 , wherein:
rotation of the threaded drive element of the first and second switching poles in a first direction is configured to transition each switching pole from the open configuration to the closed configuration, and
rotation of the threaded drive element of the third switching pole in a second direction counter to the first direction is configured to transition the switching pole from the open configuration to the closed configuration.

12. The medium voltage switching system according to claim 9 , wherein at least one of the switching poles comprises a second threaded drive element comprising an additional section to extend a length of the threaded drive element in the direction of the center axis of the threaded drive element.

13. A medium voltage switching system, comprising:
a first medium voltage circuit breaker switching pole, wherein the first medium voltage circuit breaker switching pole comprises:
a first fixed contact of a first vacuum interrupter;
a first movable contact of the first vacuum interrupter; and
a first threaded drive element,
wherein:
the first movable contact is configured to move along a first longitudinal axis of the first vacuum interrupter,
a first center axis of the first threaded drive element is parallel to the longitudinal axis of the first vacuum interrupter,
when in an open configuration the first fixed contact and the first movable contact are separated from one another,
when in a closed configuration the first fixed contact and the first movable contact are in contact with one another,
rotation of the first threaded drive element about the first center axis of the first threaded drive element in a first direction is configured to transition the first switching pole from the open configuration to the closed configuration, and
rotation of the first threaded drive element about the first center axis in a second direction counter to the first direction is configured to transition the first switching pole from the closed configuration to the open configuration;

a second medium voltage circuit breaker switching pole, wherein the second medium voltage circuit breaker switching pole comprises:
a second fixed contact of a second vacuum interrupter;
a second movable contact of the second vacuum interrupter; and
a second threaded drive element,
wherein:
the second movable contact is configured to move along a second longitudinal axis of the second vacuum interrupter,
a second center axis of the second threaded drive element is parallel to the longitudinal axis of the second vacuum interrupter,
when in an open configuration the second fixed contact and the second movable contact are separated from one another,
when in a closed configuration the second fixed contact and the second movable contact are in contact with one another,
rotation of the second threaded drive element about the second center axis of the second threaded drive element in the first direction is configured to transition the second

Assignees

• Abb Schweiz Ag

Inventors

• Gentsch Dietmar
• Reuber Christian

Classifications

• H01H33/664 Primary

  Contacts; Arc-extinguishing means, e.g. arcing rings · CPC title

• H01H3/40

  using friction, toothed, or screw-and-nut gearing · CPC title

• H01H9/0072

  particular to three-phase switches (synchronous switching H01H9/563) · CPC title

• H01H2003/405

  using a walking nut · CPC title

• H01H3/32

  Driving mechanisms, i.e. for transmitting driving force to the contacts (snap-action arrangements H01H5/00; introducing a predetermined time delay H01H7/00) · CPC title