Gas discharge filter for electrical switching apparatus

• US 6,762,389 B1
• Filed: 04/17/2003
• Issued: 07/13/2004
• Est. Priority Date: 04/17/2003
• Status: Active Grant

• Current Assignee: Eaton Intelligent Power Limited (Eaton Corporation PLC.)
• Original Assignee: Eaton Corp. (Wisconsin) (Eaton Corporation PLC.)
• Inventors: Crooks, William M., Haag, David K., Campbell, Francis C.
• Primary Examiner(s): Donovan, Lincoln
• Assistant Examiner(s): FISHMAN, MARINA
• Application Number:
  US10/417,662
• Time in Patent Office: 453 Days
• Field of Search: 218/157, 218/35, 218/147, 218/154-156, 218/34-39, 335/201, 335/202
• US Class Current: 218/157
• CPC Class Codes: H01H 9/342 Venting arrangements for arc chutes

Abstract

A gas discharge filter is for cooling ionized gases discharged from a circuit breaker. The circuit breaker includes separable contacts electrically connected in series between line and load terminals, a housing, an arc chamber within the housing structured to extinguish an arc between the separable contacts when opened, and an exhaust vent in the housing for discharging ionized gases developed from the arc. The gas discharge filter includes a heat exchanger for reducing the temperature of the discharged ionized gases, and a supporting member to secure the heat exchanger outside the housing and proximate the exhaust vent opening in the exhaust path for the discharged ionized gases. The discharge filter cools the discharged ionized gases as they pass through and around the heat exchanger thus reducing the likelihood of electrical faults associated therewith.

Claims

1. A gas discharge filter for use with an electrical switching apparatus, said electrical switching apparatus including a line side with line terminal means, a load side with load terminal means, separable contacts electrically connected in series between said line terminal means and said load terminal means, a housing, an arc chamber within said housing and structured to extinguish an arc between said separable contacts when opened, said housing having at least one exhaust vent opening for discharging through an exhaust path ionized gases which are developed from said arc, said ionized gases having a temperature, said gas discharge filter comprising:

a single conductive insert member for each of said at least one exhaust vent opening, each said since conductive insert member structured to reduce the temperature of said discharged ionized gases; and

a supporting member for securing said conductive insert member outside said housing and proximate one of said at least one exhaust vent opening in the exhaust path for said discharged ionized gases.

2. The gas discharge filter of claim 1 wherein said single conductive insert member is structured to exchange heat.

3. The gas discharge filter of claim 1 wherein said single conductive insert member is structured for removable insertion within said supporting member.

4. The gas discharge filter of claim 3 wherein said single conductive insert member is a coiled screen insert.

5. The gas discharge filter of claim 1 wherein said supporting member includes an attachment device structured to secure said supporting member outside said housing, in order that said single conductive insert member is secured adjacent to one of said at least one exhaust vent opening.

6. The gas discharge filter of claim 5 wherein said attachment device includes a plurality of threaded fasteners.

7. The gas discharge filter of claim 1 wherein said electrical switching apparatus is a circuit breaker including a plurality of poles;

wherein said housing includes a plurality of exhaust vent openings for the poles of said circuit breaker;

wherein said single conductive insert member includes one conductive insert member for each of the poles of said circuit breaker; and

wherein said supporting member supports each said one conductive insert member outside said housing and proximate one of said exhaust vent openings for the poles of said circuit breaker.

25. The gas discharge filter of claim 4 wherein said coiled screen insert is a single piece of perforated metal rolled into a coil.

8. An electrical switching apparatus comprising:

at least one line terminal;

at least one load terminal;

at least one pair of separable contacts electrically connected in series between said at least one line terminal and said at least one load terminal;

a housing;

at least one arc chamber within said housing and structured to extinguish an arc between said separable contacts when opened;

said housing having at least one exhaust vent opening for discharging through at least one exhaust path ionized gases which are developed from said arc,

said discharged ionized gases having a temperature; and

a gas discharge filter comprising;

beat reduction means a single conductive insert member for

a single conductive insert member structured to reduce the temperature of said discharged ionized gases; and

a supporting member for securing each said single conductive insert member outside said housing and proximate said at least one exhaust vent opening, in the at least one exhaust path for said discharged ionized gases.

9. The electrical switching apparatus of claim 8 wherein each said single conductive insert member is structured to exchange beat.

10. The electrical switching apparatus of claim 8 wherein each said single conductive insert member is structured for removable insertion within said supporting member.

11. The electrical switching apparatus of claim 8 wherein said supporting member includes an attachment device structured to secure said supporting member outside said housing, in order that each said single conductive insert member is secured adjacent to one of said at least one exhaust vent opening.

12. The electrical switching apparatus of claim 8 wherein said electrical switching apparatus is a circuit breaker including a plurality of poles;

wherein said at least one exhaust vent opening in said housing is a plurality of exhaust vent openings in said housing;

wherein said single conductive insert member includes one conductive insert member for each of the poles of said circuit breaker; and

wherein said supporting member supports each said one conductive insert member outside said housing and proximate one of said exhaust vent openings for the poles of said circuit breaker.

13. The gas discharge filter of claim 12 wherein said supporting member includes a bottom, a top, first and second sidewalls, a perforated front wall integral with and extending between said bottom and said top, and at least one barrier depending from said perforated front wall for forming a plurality of insulating compartments within said supporting member, said plurality of insulating compartments being structured to provide insulated separation of each said one conductive insert member without requiring a separate insulator therebetween.

14. The gas discharge filter of claim 13 wherein each said one conductive insert member is structured for removable insertion within the insulating compartments of said supporting member.

15. A power distribution system comprising:

a switchgear cabinet;

an electrical switching apparatus coupled to said switchgear cabinet, said electrical switching apparatus including at least one line terminal, at least one load terminal, at least one pair of separable contacts electrically connected in series between said at least one line terminal and said at least one load terminal, a housing, at least one arc chamber within said housing and structured to extinguish an arc between said separable contacts when opened, said housing having at least one exhaust vent opening for discharging through at least one exhaust path ionized gases which are developed from said arc, said discharged ionized gases having a temperature; and

a gas discharge filter comprising;

a single conductive insert member for each of said at least one exhaust vent opening, each said single conductive insert member structured to reduce the temperature of said discharged ionized gases; and

a supporting member for securing each said single conductive insert member outside said housing and proximate one of said at least one exhaust vent opening, in the exhaust path for said discharged ionized gases.

16. The power distribution system of claim 15 wherein each said single conductive insert member is structured to exchange heat.

17. The power distribution system of claim 16 wherein each said single conductive insert member is structured for removable insertion within said supporting member.

18. The power distribution system of claim 15 wherein said supporting member includes an attachment device structured to secure said supporting member outside said housing, in order that each said single conductive insert member is secured adjacent to one of said at least one exhaust vent opening of said housing.

19. The power distribution system of claim 15 wherein said supporting member is secured to said switchgear cabinet.

20. The power distribution system of claim 19 wherein said switchgear cabinet includes a securing element structured to secure said supporting member to said switchgear cabinet.

21. The power distribution system of claim 20 wherein said securing element includes a plurality of receiving slots;

and wherein said supporting member includes a plurality of molded tabs structured to engage said receiving slots of said securing element to secure said supporting member thereto.

22. The power distribution system of claim 15 wherein said electrical switching apparatus is a circuit breaker including a plurality of poles;

wherein said at least one exhaust vent opening in said housing is a plurality of exhaust vent openings in said housing;

wherein said single conductive insert member includes one conductive insert member for each of the poles of said circuit breaker; and

wherein said supporting member supports each said one conductive insert member outside said housing and proximate one of said exhaust vent openings for the poles of said circuit breaker.

23. The power distribution system of claim 22 wherein said supporting member includes a bottom, a top, first and second sidewalls, a perforated front wall integral with and extending between said bottom and said top, and at least one barrier depending from said perforated front wall for forming a plurality of insulating compartments within said supporting member, said plurality of insulating compartments being structured to provide insulated separation of each said one conductive insert member without requiring a separate insulator therebetween.

24. The power distribution system of claim 23 wherein each said one conductive insert member is structured for removable insertion within a corresponding one of the insulating compartments of said supporting member.