VARIABLE VENTING AND DAMPING ARC MITIGATION ASSEMBLIES AND METHODS OF ASSEMBLY

• US 20140160634A1
• Filed: 12/07/2012
• Published: 06/12/2014
• Est. Priority Date: 12/07/2012
• Status: Active Grant

• Current Assignee: ABB SPA (ABB Limited)
• Original Assignee: General Electric Company
• Inventors: Palvadi, Srinivas Naga, Kumar, Ravi, Gopularam, Chandrakanth
• Granted Patent: US 8,993,916 B2
• Time in Patent Office: Days
• US Class Current: 361/600
• CPC Class Codes: H01H 69/00 Apparatus or processes for the manufacture of emergency protective devices
• CPC Class Codes: H01H 9/50 Means for detecting the presence of an arc or discharge
• CPC Class Codes: H01T 1/15 for protection against excessive pressure
• CPC Class Codes: H01T 2/02 comprising a trigger electrode or an auxiliary spark gap
• CPC Class Codes: H01T 4/04 Housings H01T4/06 takes precedence
• CPC Class Codes: H02H 1/0015 Using arc detectors
• CPC Class Codes: Y10T 29/49117 Conductor or circuit manufacturing

Abstract

Equipment protection systems, arc containment devices, and methods of assembling arc containment devices are disclosed. In one example, an electrical isolation structure includes a conductor base, a cover coupled to the conductor base and defining an isolation chamber, a containment shield disposed on the conductor base within the isolation chamber, and a biasing assembly positioned between the cover and the containment shield. The containment shield defines a containment chamber configured to enclose the plurality of electrode assemblies. The containment shield is configured to at least partially contain the arc products within the containment chamber. The biasing assembly is configured to permit the containment shield to move away from the conductor base to thereby define a gap between the conductor base and the containment shield to enable at least some of the arc gases to vent from the containment chamber.

Claims

1. A circuit protection device for use with a circuit that includes at least one pair of conductors, said circuit protection device configured to generate an arc, the arc generating arc products including arc gases, said circuit protection device comprising:

at least one pair of electrode assemblies, a first electrode assembly of the pair of electrode assemblies electrically coupled to a first conductor of the at least one pair of conductors, and a second electrode assembly of the pair of electrode assemblies electrically coupled to a second conductor of the at least one pair of conductors, said at least one pair of electrode assemblies configured to generate the arc;

a conductor base for mounting said electrode assemblies thereon;

a cover coupled to said conductor base and defining at least one isolation chamber, wherein said pair of electrode assemblies is disposed within said at least one isolation chamber;

a containment shield disposed on said conductor base within the isolation chamber, said containment shield defining a containment chamber enclosing said at least one pair of electrode assemblies, said containment shield configured to at least partially contain arc products within the containment chamber; and

a biasing assembly positioned between said cover and said containment shield and coupled to at least one of said cover and said containment shield, said biasing assembly configured to permit said containment shield to move away from said conductor base to thereby define a gap between said conductor base and said containment shield to enable at least some of the arc gases to vent from the containment chamber.

2. A circuit protection device in accordance with claim 1, wherein said biasing assembly comprises at least one biasing member configured to control a distance and speed at which said containment shield moves away from said conductor base.

3. A circuit protection device in accordance with claim 1, wherein said cover comprises a plurality of vents located circumferentially thereon and configured to vent at least some of the arc gases from the at least one isolation chamber.

4. A circuit protection device in accordance with claim 1, further comprising at least one chimney coupled to said cover, wherein said cover comprises at least one vent configured to vent at least some of the arc gases from the at least one isolation chamber, and wherein said at least one chimney overlies the at least one vent.

5. A circuit protection device in accordance with claim 1, wherein said conductor base comprises an annular groove configured to receive a bottom portion of said containment shield.

6. A circuit protection device in accordance with claim 1, wherein said biasing assembly is configured to reduce transport related displacements of said containment shield.

7. A circuit protection device in accordance with claim 1, wherein said biasing assembly comprises at least one biasing member configured to provide a bias force to bias said containment shield away from said cover.

8. A circuit protection device in accordance with claim 6, wherein said shock shield comprises at least one mechanical formation configured to reduce a shock pressure wave within said containment chamber.

9. An electrical isolation structure for use with an arc mitigation device that includes a plurality of electrode assemblies each having an electrode configured to produce an arc, the arc generating arc products including arc gases, said electrical isolation structure comprising:

a conductor base;

a cover coupled to said conductor base and defining an isolation chamber therebetween; and

a containment shield disposed on said conductor base within the isolation chamber, said containment shield defining a containment chamber configured to enclose the plurality of electrode assemblies, said containment shield configured to at least partially contain arc products within the containment chamber; and

a biasing assembly positioned between said cover and said containment shield and coupled to at least one of said cover and said containment shield, said biasing assembly configured to permit said containment shield to move away from said conductor base to thereby define a gap between said conductor base and said containment shield to enable at least some of the arc gases to vent from the containment chamber.

10. An electrical isolation structure in accordance with claim 9, wherein said biasing assembly comprises at least one biasing member configured to control a distance and speed at which said containment shield moves away from said conductor base.

11. An electrical isolation structure in accordance with claim 9, wherein said biasing assembly to permit said containment shield to move approximately 0.5 inches away from said conductor base.

12. An electrical isolation structure in accordance with claim 9, wherein said conductor base comprises an annular groove configured to receive a bottom portion of said containment shield.

13. An electrical isolation structure in accordance with claim 9, wherein said biasing assembly comprises at least one biasing member configured to provide a bias force to bias said containment shield away from said cover.

14. An electrical isolation structure in accordance with claim 13, wherein said containment shield is slideably coupled to said cover by said biasing assembly to permit said containment shield to move relative to said cover.

15. A method of assembling a circuit protection device for use with a circuit that includes at least one pair of conductors, wherein said circuit protection device includes a conductor base, a containment shield defining a containment chamber, a cover, and at least one pair of electrode assemblies configured to produce an arc, the arc generating arc products including arc gases, said method comprising:

securing the at least one pair of electrode assemblies to the conductor base;

coupling the containment shield to the cover such that the containment shield is operable to move relative to the cover to define a gap between the containment shield and the conductor base to vent arc gases from the containment chamber;

coupling the cover to the conductor base such that the at least one pair of electrode assemblies is disposed within the containment chamber and the containment shield is disposed on the conductor base;

electrically coupling a first electrode assembly of the pair of electrode assemblies to a first conductor of the at least one pair of conductors; and

electrically coupling a second electrode assembly of the pair of electrode assemblies to a second conductor of the at least one pair of conductors.

16. A method of assembling a circuit protection device in accordance with claim 15, wherein coupling the containment shield to the cover comprises coupling the containment shield to the cover with a biasing assembly comprising at least one biasing member configured to control a distance and speed at which said containment shield is operable to move relative to said cover.

17. A method of assembling a circuit protection device in accordance with claim 15, wherein coupling the containment shield to the cover comprises coupling the containment shield to the cover such that the containment shield is operable to move approximately 0.5 inches in a direction towards said cover.

18. A method of assembling a circuit protection device in accordance with claim 15, wherein coupling the cover to the conductor base comprises coupling the cover to a conductor base comprising an annular groove configured to receive a bottom portion of the containment shield.

19. A method of assembling a circuit protection device in accordance with claim 18, wherein coupling the cover to the conductor base comprises coupling the cover to the conductor base with a biasing assembly and with the bottom portion of the containment shield disposed within the annular groove, the biasing assembly configured to permit the containment shield to move away from the conductor base to define a gap between the annular groove and the containment shield to vent at least a portion of the arc gases from the containment chamber.

20. A method of assembling a circuit protection device in accordance with claim 15, coupling the containment shield to the cover comprises slidably coupling the containment shield to the cover with a biasing assembly.