Low profile blow-on force automatic switch

Patent metadata

Field	Value
Publication number	US-11501930-B2
Application number	US-201816204203-A
Country	US
Kind code	B2
Filing date	Nov 29, 2018
Priority date	Oct 23, 2015
Publication date	Nov 15, 2022
Grant date	Nov 15, 2022

Abstract

Systems of automatic transfer switches (ATS) are disclosed herein. One apparatus includes at least two automatic transfer switches coupled together. Each automatic transfer switches has contacts to couple a power source to a load. For each switch, an electromagnetic force biasing the contacts to each other is present if an electrical current flows through the switch. The automatic transfer switches may be on separate cassettes or on a single cassette. The power source of each switch may be the same or different.

First claim

What is claimed is:

1. A system of coupled automatic transfer switches, the system comprising:
a stationary bar; and
a plurality of automatic transfer switches on the stationary bar, each of the plurality of automatic transfer switches comprising:
a source bar structured to connect to a corresponding power source; and
a movable bar electrically coupled and rotatably connected to the stationary bar, wherein the movable bar contacts the source bar to provide power from the corresponding power source, wherein the movable bar is subjected to an electromagnetic force biasing the movable bar towards the source bar, and wherein the electromagnetic force is induced by current flowing through the stationary bar and the movable bar,
wherein the movable bars of the plurality of automatic transfer switches are disposed at a same side of the stationary bar; and
wherein each of the movable bars is coupled to the stationary bar via a post, each respective post extending in a direction substantially perpendicular to the stationary bar, wherein each post and each movable bar respectively coupled thereto is spaced from an adjacent post and movable bar by a distance along the stationary bar.

2. The system of claim 1 , wherein the stationary bar is formed from multiple sections linked together.

3. The system of claim 2 , wherein each of the plurality of automatic transfer switches has a front end and a back end, wherein the corresponding movable bar is connected to the stationary bar at the front end and the corresponding source bar is disposed at the back end.

4. The system of claim 3 , wherein the plurality of automatic transfer switches are arranged on the stationary bar such that a direction of the front end to the back end is the same for each of the plurality of automatic transfer switches.

5. The system of claim 4 , wherein each of the source bars of the plurality of automatic transfer switches is configured to connect to a different power source, and wherein one movable bar is in contact with the corresponding source bar at a time.

6. The system of claim 2 , wherein the source bar of a first automatic transfer switch and the source bar of a second automatic transfer switch are connected to a same power source, and wherein one of the first automatic transfer switch or the second automatic transfer switch maintains power transmission upon failure of the other of the first automatic transfer switch or the second automatic transfer switch.

7. The system of claim 1 , wherein at least one of the plurality of automatic transfer switches comprises a movable linkage, a T-shaped linkage, a spring, and a cam with a hex bar.

8. The system of claim 7 , wherein the first movable bar is linked to the cam through the movable linkage, wherein the spring is wound around the T-shaped linkage and coupled to the cam, wherein the hex bar is structured to rotate the cam from an initial closed position to an ultimate closed position.

9. The system of claim 8 , wherein at the initial closed position the first movable bar contacts the first source bar the spring is substantially not compressed, and wherein at the ultimate closed position the first movable bar is pressed against the first source bar and the spring is compressed.

10. The system of claim 1 , wherein the plurality of automatic transfer switches comprises a first automatic transfer switch with a corresponding movable bar connected to a first utility, a second automatic transfer switch with a corresponding movable bar connected to a second utility, and a third automatic transfer switch with a corresponding movable bar connected to a generator.

11. The system of claim 1 , wherein the movable bar of each of the plurality of automatic transfer switches (i) includes a first end and a second end, (ii) is rotatably connected to the stationary bar at the first end, and (iii) contacts the source bar at the second end, and wherein first ends of each of the respective movable bars of the plurality of automatic transfer switches are disposed at the same side of the stationary bar.

12. A system comprising:
a generator; and
a plurality of automatic transfer switches on a stationary bar, each of the plurality of automatic transfer switches comprising:
a source bar structured to connect to a corresponding power source of a plurality of power sources, wherein the plurality of power sources comprises the generator; and
a movable bar electrically coupled and rotatably connected to the stationary bar, wherein the movable bar contacts the source bar to provide power from the corresponding power source, wherein the movable bar is subjected to an electromagnetic force biasing the movable bar towards the source bar, wherein the electromagnetic force is induced by current flowing through the stationary bar and the movable bar, and wherein the movable bars of the plurality of automatic transfer switches are disposed at a same side of the stationary bar;
wherein the movable bar of each of the plurality of automatic transfer switches is coupled to the stationary bar via a post, the post extending in a direction substantially perpendicular to the stationary bar, wherein the post and the movable bar respectively coupled thereto is spaced from an adjacent post and movable bar by a distance along the stationary bar.

13. The system of claim 12 , wherein the stationary bar is formed from multiple sections linked together.

14. The system of claim 13 , wherein each of the plurality of automatic transfer switches has a front end and a back end, wherein the corresponding movable bar is connected to the stationary bar at the front end and the corresponding source bar is disposed at the back end.

15. The system of claim 14 , wherein the plurality of automatic transfer switches are arranged on the stationary bar such that a direction of the front end to the back end is the same for each of the plurality of automatic transfer switches.

16. The system of claim 15 , wherein each of the source bars of the plurality of automatic transfer switches is configured to connect to a different power source, and wherein one movable bar is in contact with the corresponding source bar at a time.

17. The system of claim 13 , wherein the source bar of a first automatic transfer switch and the source bar of a second automatic transfer switch are connected to a same power source, and wherein one of the first automatic transfer switch or the second automatic transfer switch maintains power transmission upon failure of the other of the first automatic transfer switch or the second automatic transfer switch.

18. The system of claim 12 , wherein at least one of the plurality of automatic transfer switches comprises a movable linkage, a T-shaped linkage, a spring, and a cam with a hex bar.

19. The system of claim 18 , wherein the first movable bar is linked to the cam through the movable linkage, wherein the spring is wound around the T-shaped linkage and coupled to the cam, wherein the hex bar is structured to rotate the cam from an initial closed position to an ultimate closed position.

20. The system of claim 12 , wherein the plurality of automatic transfer switches comprises a first automatic transfer switch with a corresponding movable bar connected to a first utility, a second automatic transfer switch with a corresponding movable bar connected to a second utility, and a third automatic transfer switch with a corresponding movable bar connected to the generator.

Assignees

• Cummins Power Generation Ip

Inventors

• Zhou Wangwei
• Hanson Nicholas O

Classifications

• H01H1/42

  Knife-and-clip contacts · CPC title

• H01H1/54 Primary

  by magnetic force {(combined with electrodynamic opening H01H77/101)} · CPC title

• H02J9/061

  for DC powered loads · CPC title

• H01H1/22

  with rigid pivoted member carrying the moving contact · CPC title

• H01H2300/018

  Application transfer; between utility and emergency power supply · CPC title