Arc extinguishing contact assembly for a circuit breaker assembly

Patent metadata

Field	Value
Publication number	US-9343252-B2
Application number	US-201414469621-A
Country	US
Kind code	B2
Filing date	Aug 27, 2014
Priority date	Aug 27, 2014
Publication date	May 17, 2016
Grant date	May 17, 2016

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 number 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;
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;
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;
wherein each intermediate arc contact assembly generates at least one local arc;
each intermediate arc contact assembly includes a first arc contact assembly and a second arc contact assembly;
each said fixed arc contact assembly includes an arcing surface;
each said intermediate first arc contact assembly includes an arcing surface;
each said intermediate second arc contact assembly includes an arcing surface;
each said movable arc contact assembly includes an arcing surface; and
each said local arc is generated from at least one of an intermediate first arc contact assembly arcing surface or an intermediate second arc contact assembly arcing surface.

2. 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 number 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;
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;
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;
wherein each intermediate arc contact assembly generates at least one local arc;
each intermediate arc contact assembly includes a first arc contact assembly and a second arc contact assembly;
each said fixed arc contact assembly includes an arcing surface;
each said intermediate first arc contact assembly includes an arcing surface;
each said intermediate second arc contact assembly includes an arcing surface;
each said movable arc contact assembly includes an arcing surface; and
each said intermediate first arc contact assembly arc surface and intermediate second arc contact assembly arc surface is disposed on a removable component.

3. The arc extinguishing contact assembly of claim 2 wherein:
said fixed arc contact assembly includes a conductive base member and a conductive insert, wherein said fixed arc contact assembly conductive insert is removably coupled to said fixed arc contact assembly base member;
each intermediate arc contact assembly includes a support member;
each said intermediate first arc contact assembly includes a conductive insert, wherein each said intermediate first arc contact assembly conductive insert is removably coupled to an associated intermediate arc contact assembly support member; and
each said intermediate second arc contact assembly includes a conductive insert, wherein each said intermediate second arc contact assembly conductive insert is removably coupled to an associated intermediate arc contact assembly support member.

4. The arc extinguishing contact assembly of claim 3 wherein:
at least one said intermediate first arc contact assembly conductive insert includes an elongated body;
said at least one intermediate first arc contact assembly conductive insert body includes a proximal, first end and a distal, second end;
said at least one intermediate first arc contact assembly conductive insert body second end includes an axial surface;
said at least one intermediate first arc contact assembly conductive insert body second end axial surface includes an outer surface, a medial surface, and a central surface;
said outer surface extending about said medial surface;
said medial surface extending about said central surface;
wherein said medial surface is made from an arc attracting metal; and
wherein said central surface is made from an arc repelling material.

5. The arc extinguishing contact assembly of claim 4 wherein:
said arc attracting metal is selected from the group consisting of Hf, W and mixtures thereof; and
said arc repelling material is selected from the group consisting of ceramic, porcelain, alumina, epoxy resins, and mixtures thereof.

6. The arc extinguishing contact assembly of claim 4 wherein each said intermediate second arc contact assembly conductive insert includes an elongated body including an inner surface defining a passage.

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

8. The arc extinguishing contact assembly of claim 7 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.

9. The arc extinguishing contact assembly of claim 8 wherein said nonmetals fluoride are selected from the group consisting of BF 3 , NF 3 , and mixtures thereof.

10. The arc extinguishing contact assembly of claim 8 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.

11. The arc extinguishing contact assembly of claim 8 wherein said hydr

Assignees

• Eaton Corp

Inventors

• Ashtekar Koustubh Dnyandeo
• Benke James Jeffery

Classifications

• H01H33/95

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

• H01H1/02

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

• H01H33/7092 Primary

  characterised by several arcing chambers in series (H01H33/7023 - H01H33/7084 take precedence) · CPC title

• H01H2033/907

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

• H01H33/64

  wherein the break is in gas (vacuum switches H01H33/66) · CPC title