Circuit breaker with fluid injection

Patent metadata

Field	Value
Publication number	US-9412541-B2
Application number	US-201414304335-A
Country	US
Kind code	B2
Filing date	Jun 13, 2014
Priority date	Dec 13, 2011
Publication date	Aug 9, 2016
Grant date	Aug 9, 2016

Abstract

A circuit breaker including an ejection device with a compartment, in which an arc-extinction medium for improving circuit breaker operation is contained, and having an ejection orifice through which the arc-extinction medium is to be ejected, wherein the ejection orifice opens out into an injection zone of the circuit breaker in which the pressure is lower than in an arcing zone when an arc is present, and wherein the arc-extinction medium and/or exhaust-cooling medium is at least partially present in liquid form, when it is contained in the ejection device.

First claim

What is claimed is:

1. A circuitbreaker comprising at least one ejection device, said ejection device comprising a compartment, in which an arc-extinction medium and/or exhaust-cooling medium for improving circuit breaker operation is contained, and having at least one ejection orifice through which the arc-extinction medium and/or exhaust-cooling medium is to be ejected, wherein the ejection orifice opens out into an injection zone of the circuit breaker in which the pressure is lower than in an arcing zone when an arc is present, and wherein the arc-extinction medium and/or exhaust-cooling medium is at least partially present in liquid form, when it is contained in the ejection device,
wherein the arc-extinction medium and/or exhaust-cooling medium comprises an organofluorine compound having a boiling point Tb at 1 bar higher than −60° C.,
wherein the organofluorine compound comprises a fluoroketone or a mixture of fluoroketones, including a fluoromonoketone.

2. The circuit breaker according to claim 1 , wherein the organofluorine compound comprises in addition at least one atom selected form the group consisting of oxygen, hydrogen, nitrogen, and iodine.

3. The circuit breaker according to claim 1 , wherein the fluoromonoketone contains 5 to 15 carbon atoms.

4. The circuit breaker according to claim 1 , wherein the fluoromonoketone contains from 5 to 9 carbon atoms.

5. The circuit breaker according to claim 1 , wherein the fluoromonoketone contains exactly 5 or exactly 6 or exactly 7 or exactly 8 carbon atoms.

6. The circuit breaker according to claim 1 , wherein at least one background gas is present which is selected from the group consisting of: CO 2 , N 2 , O 2 , SF 6 , CF 4 , a noble gas, and mixtures thereof.

7. The circuit breaker according to claim 1 , wherein the circuit breaker is a high voltage circuit breaker, a medium voltage circuit breaker, a generator circuit breaker, or a load-break switch.

8. The circuit breaker according to claim 1 , wherein the boiling point Tb at 1 bar is higher than −10° C.

9. A circuitbreaker comprising at least one ejection device, said ejection device comprising a compartment, in which an arc-extinction medium and/or exhaust-cooling medium for improving circuit breaker operation is contained, and having at least one ejection orifice through which the arc-extinction medium and/or exhaust-cooling medium is to be ejected, wherein the ejection orifice opens out into an injection zone of the circuit breaker in which the pressure is lower than in an arcing zone when an arc is present, and wherein the arc-extinction medium and/or exhaust-cooling medium is at least partially present in liquid form, when it is contained in the ejection device,
wherein the ejection device is designed such that the arc-extinction medium and/or exhaust-cooling medium is ejected at a rate in a range from 0.1 ml/ms to 15 ml/ms.

10. The circuit breaker according to claim 9 , wherein the circuit breaker further comprises, outside the ejection device, a dielectric insulation medium comprising an organofluorine compound selected from the group consisting of: a fluoroether; a fluoroamine; a fluoroketone; and mixtures thereof, wherein the organofluorine compound is at least partially in gaseous state at operational conditions of the circuit breaker.

11. The circuit breaker according to claim 9 , wherein at least one background gas is present which is selected from the group consisting of: CO 2 , N 2 , O 2 , SF 6 , CF 4 , a noble gas, and mixtures thereof.

12. The circuit breaker according to claim 9 , wherein the circuit breaker is a high voltage circuit breaker, a medium voltage circuit breaker, a generator circuit breaker, or a load-break switch.

13. A gas-insulated switchgear, comprising a circuit breaker according to claim 9 .

14. The circuit breaker according to claim 9 , wherein the ejection device is designed such that the arc-extinction medium and/or exhaust-cooling medium is ejected at a rate in a range from 1 ml/ms to 10 ml/ms.

15. The circuit breaker according to claim 9 , wherein the ejection device is designed such that the arc-extinction medium and/or exhaust-cooling medium is ejected at a rate in a range from 3 ml/ms to 6 ml/ms.

16. The circuit breaker according to any claim 9 , wherein the arc-extinction medium and/or exhaust-cooling medium comprises an organofluorine compound having a boiling point Tb at 1 bar higher than −60° C.

17. The circuit breaker according to claim 9 , wherein the arc-extinction medium and/or exhaust-cooling medium comprises a fluoromonoketone containing 5 to 15 carbon atoms.

18. The circuit breaker according to claim 17 , wherein the fluoromonoketone contains from 5 to 9 carbon atoms.

19. The circuit breaker according to claim 17 , wherein the fluoromonoketone contains exactly 5 or exactly 6 or exactly 7 or exactly 8 carbon atoms.

20. A circuitbreaker comprising at least one ejection device, said ejection device comprising a compartment, in which an arc-extinction medium and/or exhaust-cooling medium for improving circuit breaker operation is contained, and having at least one ejection orifice through which the arc-extinction medium and/or exhaust-cooling medium is to be ejected, wherein the ejection orifice opens out into an injection zone of the circuit breaker in which the pressure is lower than in an arcing zone when an arc is present, and wherein the arc-extinction medium and/or exhaust-cooling medium is at least partially present in liquid form, when it is contained in the ejection device,
wherein the ejection device is designed such that the arc-extinction medium and/or exhaust-cooling medium is ejected during an ejection time shorter than 25 ms.

21. The circuit breaker according to claim 20 , wherein the circuit breaker further comprises, outside the ejection device, a dielectric insulation medium comprising an organofluorine compound selected from the group consisting of: a fluoroether; a fluoroamine; a fluoroketone; and mixtures thereof, wherein the organofluorine compound is at least partially in gaseous state at operational conditions of the circuit breaker.

22. The circuit breaker according to claim 20 , wherein at least one background gas is present which is selected from the group consisting of: CO 2 , N 2 , O 2 , SF 6 , CF 4 , a noble gas, and mixtures thereof.

23. The circuit breaker according to claim 20 , wherein the circuit breaker is a high voltage circuit breaker, a medium voltage circuit breaker, a generator circuit breaker, or a load-break switch.

24. A gas-insulated switchgear, comprising a circuit breaker according to claim 20 .

25. The circuit breaker according to claim 20 , wherein the ejection time is in a range from 5 ms to 15 ms.

26. The circuit breaker according to claim 20 , wherein the ejection time is about 10 ms.

27. The circuit breaker according to any claim 20 , wherein the arc-extinction medium and/or exhaust-cooling medium comprises an organofluorine compound having a boiling point Tb at 1 bar higher than −60° C.

28. The circuit breaker according to claim 20 , wherein the arc-extinction medium and/or exhaust-cooling medium comprises a fluoromonoketone containing 5 to 15 carbon atoms.

29. The circuit breaker according to claim 28 , wherein the fluoromonoketone contains from 5 to 9 carbon atoms.

30. The circuit breaker according to claim 28 ,

Assignees

• Pisu Francesco
• Galindo-Lozano Francia
• Mantilla Javier
• Buergler Mathias-Dominic
• Gariboldi Nicola
• Cossalter Oliver
• Stoller Patrick
• Grob Stephan
• Kotilainen Sami
• Abb Technology Ag

Inventors

• Pisu Francesco
• Galindo-Lozano Francia
• Mantilla Javier
• Buergler Mathias-Dominic
• Gariboldi Nicola
• Cossalter Oliver
• Stoller Patrick
• Grob Stephan
• Kotilainen Sami

Classifications

• H01H33/901

  making use of the energy of the arc or an auxiliary arc · CPC title

• H01H33/22 Primary

  Selection of fluids for arc-extinguishing · CPC title

• H01H33/60

  Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid · CPC title

• H01H33/90

  this movement being effected by or in conjunction with the contact-operating mechanism · CPC title

• H01H33/903

  and assisting the operating mechanism · CPC title