Arc extinguishing contact assembly for a circuit breaker assembly

Patent metadata

Field	Value
Publication number	US-9679719-B2
Application number	US-201615019134-A
Country	US
Kind code	B2
Filing date	Feb 9, 2016
Priority date	Aug 27, 2014
Publication date	Jun 13, 2017
Grant date	Jun 13, 2017

Abstract

An arc extinguishing contact assembly for a circuit breaker assembly is provided. The arc extinguishing contact assembly includes a fixed contact assembly, a movable contact assembly and an arc extinguishing assembly. The fixed contact assembly includes a fixed arc contact assembly, a fixed main contact assembly, and a number of movable, intermediate arc contact assemblies. The movable contact assembly includes a movable arc contact assembly and a movable main contact assembly. The arc extinguishing assembly is structured to extinguish an arc generated as the movable contact assembly moves between an open, first position and a closed, second position.

First claim

What is claimed is:

1. An arc extinguishing contact assembly for a circuit breaker assembly, the circuit breaker assembly including a housing assembly and an operating mechanism, said housing assembly defining an enclosed space, said operating mechanism structured to be operatively coupled to a movable contact assembly and structured to move the movable contact assembly between an open, first position, wherein the movable contact assembly is effectively spaced from a fixed contact assembly, and a closed, second position, wherein the movable contact assembly is coupled to, and in electrical communication with, the fixed contact assembly, said arc extinguishing contact assembly comprising:
a fixed contact assembly including an arc contact assembly, a main contact assembly, and a plurality of movable, intermediate arc contact assemblies;
a movable contact assembly including an arc contact assembly and a main contact assembly, said movable contact assembly structured to move between an open, first position, wherein the movable contact assembly is effectively spaced from said fixed contact assembly, and a closed, second position, wherein the movable contact assembly is coupled to, and in electrical communication with, said fixed contact assembly, with an arcing position there between; and
an arc extinguishing assembly structured to extinguish a number of arcs generated as said movable contact assembly moves between said first position and said second position.

2. The arc extinguishing contact assembly of claim 1 wherein said arc extinguishing assembly is structured to divide a theoretical arc into multiple local arcs wherein the local arcs have a reduced voltage relative to said theoretical arc.

3. The arc extinguishing contact assembly of claim 2 wherein each intermediate arc contact assembly generates at least one local arc.

4. The arc extinguishing contact assembly of claim 1 wherein said arc extinguishing assembly utilizes an arc suppressing fluid.

5. The arc extinguishing contact assembly of claim 4 wherein said arc suppressing fluid is selected from the group consisting of non-metallic oxides and gaseous elements, nonmetal fluoride, hydrogen compounds, diatomic gases, inert gases, modified air, mixtures of gases, environmentally friendly gases, and mixtures and combinations thereof.

6. The arc extinguishing contact assembly of claim 5 wherein said nonmetals fluoride are selected from the group consisting of BF 3 , NF 3 , and mixtures thereof.

7. The arc extinguishing contact assembly of claim 5 wherein said non-metallic oxides and gaseous elements are selected from the group consisting of CO 2 , SO 2 , N 2 O, and mixtures thereof.

8. The arc extinguishing contact assembly of claim 5 wherein said hydrogen compounds are selected from the group consisting of CH 4 , NH 3 , and mixtures thereof.

9. The arc extinguishing contact assembly of claim 5 wherein said diatomic gases are selected from the group consisting of O 2 , N 2 , F 2 , H 2 , and mixtures thereof.

10. The arc extinguishing contact assembly of claim 5 wherein said inert gases are selected from the group consisting of He, Ar, Ne, Kr, Xe, and mixtures thereof.

11. The arc extinguishing contact assembly of claim 5 wherein said modified air is any mixture of N 2 and O 2 .

12. The arc extinguishing contact assembly of claim 5 wherein said mixtures of gases are selected from the group consisting of Has (35% H 2 and 65% Ar), F 5 (95% N 2 and 5% H), Arcal (Ar, CO 2 , He, O 2 ), and mixtures thereof.

13. The arc extinguishing contact assembly of claim 5 wherein said environmentally friendly gases are selected from the group consisting of Air, CO 2 , O 2 , N 2 , NO, and mixtures thereof.

14. The arc extinguishing contact assembly of claim 1 wherein:
each said intermediate first arc contact assembly includes a number of arcing surfaces; and
each said intermediate first arc contact assembly number of arcing surfaces disposed in an arc controlling configuration.

15. The arc extinguishing contact assembly of claim 14 wherein:
wherein said number of arcing surfaces includes an arc surface having an arc attracting metal, and, an arc surface having an arc repelling material.

16. An arc extinguishing contact assembly for a circuit breaker assembly, the circuit breaker assembly including a housing assembly and an operating mechanism, said housing assembly defining an enclosed space, said operating mechanism structured to be operatively coupled to a movable contact assembly and structured to move the movable contact assembly between an open, first position, wherein the movable contact assembly is effectively spaced from a fixed contact assembly, and a closed, second position, wherein the movable contact assembly is coupled to, and in electrical communication with, the fixed contact assembly, said arc extinguishing contact assembly comprising:
a fixed contact assembly including an arc contact assembly and a main contact assembly;
a movable contact assembly including an arc contact assembly and a main contact assembly, said movable contact assembly structured to move between an open, first position, wherein the movable contact assembly is effectively spaced from said fixed contact assembly, and a closed, second position, wherein the movable contact assembly is coupled to, and in electrical communication with, said fixed contact assembly, with an arcing position there between; and
an arc extinguishing assembly including a number of movable, intermediate arc contact assemblies and a number of collapsible chambers.

17. The arc extinguishing contact assembly of claim 16 wherein each collapsible chamber includes telescoping sidewalls.

18. The arc extinguishing contact assembly of claim 17 wherein said telescoping sidewalls are disposed in series along a common longitudinal axis.

19. The arc extinguishing contact assembly of claim 16 wherein said arc extinguishing assembly is structured to divide a theoretical arc into multiple local arcs wherein the local arcs have a reduced voltage relative to said theoretical arc.

20. The arc extinguishing contact assembly of claim 19 wherein each intermediate arc contact assembly generates at least one local arc.

Assignees

• Eaton Corp

Inventors

• Ashtekar Koustubh Dnyandeo
• Benke James Jeffery

Classifications

• H01H1/02

  characterised by the material thereof {(containing gas-evolving material H01H33/765)} · CPC title

• H01H33/22

  Selection of fluids for arc-extinguishing · CPC title

• H01H33/08 Primary

  Stationary parts for restricting or subdividing the arc, e.g. barrier plate · CPC title

• H01H33/95

  the arc-extinguishing fluid being air or gas · CPC title

• H01H2033/907

  using tandem pistons, e.g. several compression volumes being modified in conjunction or sequential · CPC title