Circuit breaker with fluid injection

1. A circuit breaker comprising at least one ejection device comprising an arc-extinction medium and/or exhaust-cooling medium for improving circuit breaker operation, and in particular for improving extinction of an arc formed during a breaker operation, wherein the arc-extinction medium and/or exhaust-cooling medium comprises an organofluorine compound having a boiling point T b at 1 bar higher than −60° C. and being selected from the group consisting of: a fluoroether; a fluoroamine; a fluoroketone; and mixtures thereof.

2. The circuit breaker according to claim 1 , wherein the organofluorine compound has a boiling point Tb at 1 bar higher than −20° C.

3. The circuit breaker according to claim 1 , 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.

4. The circuit breaker according to claim 3 , wherein the arc-extinction medium and/or exhaust-cooling medium is present in fully liquid form, when it is contained in the ejection device.

5. The circuit breaker according to claim 3 , wherein the arc-extinction medium and/or exhaust-cooling medium is present in the ejection device at least partially or fully in liquid form under operating conditions of the circuit breaker, in particular under operating temperatures and/or operating pressures of the circuit breaker.

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

7. The circuit breaker according to claim 1 , wherein the arc-extinction medium and/or exhaust-cooling medium, in particular the arc-extinction liquid and/or exhaust-cooling liquid, further comprises at least one compound selected from the group consisting of: a fully fluorinated fluorocarbon, in particular C 2 F 6 and C 3 F 8 ; a hydrofluorocarbon; and mixtures thereof.

8. The circuit breaker according to claim 1 , wherein the fluoroether, the fluoroamine and the fluoroketone are fully fluorinated.

9. The circuit breaker according to claim 1 , wherein the arc-extinction medium and/or exhaust-cooling medium comprises a fluoroketone or a mixture of fluoroketones, in particular a fluoromonoketone.

10. The circuit breaker according to claim 9 , wherein the fluoroketone, in particular the fluoromonoketone, contains from 5 to 15 carbon atoms.

11. The circuit breaker according to claim 1 , 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.

12. The circuit breaker according to claim 1 , 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.

13. The circuit breaker according to claim 1 , 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, which organofluorine compound is at least partially in gaseous state at operational conditions of the circuit breaker.

14. The circuit breaker according to claim 13 , 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, in particular argon, and mixtures thereof.

15. The circuit breaker according to claim 1 , wherein the ejection device comprises a compartment in which the arc-extinction medium and/or exhaust-cooling medium is contained and which has at least one ejection orifice through which the arc-extinction medium is to be ejected.

16. The circuit breaker according to claim 15 , wherein the ejection orifice opens out directly into an arcing zone of the circuit breaker.

17. The circuit breaker according to claim 15 , wherein the ejection orifice opens out into an injection zone of the circuit breaker, in which injection zone the pressure is lower than in an arcing zone when an arc is present.

18. The circuit breaker according to claim 15 , wherein the ejection orifice opens out into a heating volume and/or a compression chamber of the circuit breaker for improving extinction of an arc formed during a breaker operation.

19. The circuit breaker according to claim 15 , wherein the ejection orifice opens out into an exhaust volume of the circuit breaker for improving exhaust-cooling during a breaker operation.

20. The circuit breaker according to claim 15 , wherein the ejection orifice is a valve which only opens when a predetermined threshold pressure is reached in the compartment.

21. The circuit breaker according to claim 15 , further comprising a floating piston which is designed to transmit a compressing force onto the interior of the compartment during a breaker operation.

22. The circuit breaker according to claim 21 , wherein the ejection device connected to a moving part of the circuit breaker such that a movement of the moving part during a breaker operation is translated into a movement of the floating piston relative to the compartment for compressing the compartment.

23. The circuit breaker according to claim 21 , wherein the ejection device further comprises an auxiliary compartment which contains a compressible medium, in particular a gas, the compartment and the auxiliary compartment being separated from each other by the floating piston.

24. The circuit breaker according to claim 23 , further comprising a piston for compressing the interior of the auxiliary compartment, wherein a moving part of the circuit breaker causes a relative movement between the piston and the auxiliary compartment, in particular wherein the auxiliary compartment is connected to the moving part.

25. The circuit breaker according to claim 23 , wherein the compartment and the auxiliary compartment are arranged axially displaced from each other and/or are arranged coaxially, and/or wherein the circuit breaker comprises a housing comprising the compartment and the auxiliary compartment, said housing having a cylindrical shape.

26. The circuit breaker according to claim 23 , wherein an area of the piston for compressing the interior of the auxiliary compartment is smaller than an area of the floating piston.

27. The circuit breaker according to claim 21 , wherein the floating piston is designed such that its compressing force is increased when an arc is present, in particular wherein the increase is at least partially caused by an increase of the pressure in a or the heating volume or compression chamber or exhaust volume of the circuit breaker due to the heating by the arc.

28. The circuit breaker according to claim 27 , wherein the floating piston comprises a primary floating piston facing the heating volume or compression chamber or exhaust volume and a secondary floating piston facing the compartment, said primary floating piston and said secondary floating piston being rigidly connected to each other.

29. The circuit breaker according to claim 28 , wherein the primary floating piston has a larger area than the secondary floating piston.

30. 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.

31. The circuit breaker according to claim 1 , with the circuit breaker comprising the ejection device comprising the arc-extinction medium for improving extinction of the arc formed during a breaker operation, wherein the arc-extinction medium when contained in the ejection device comprises an auxiliary injection compound selected from the group consisting of: O 2 , CO 2 , N 2 , CF 4 , a noble gas, in particular argon, and mixtures thereof.

32. The circuit breaker according to claim 31 , wherein the auxiliary injection compound is or comprises oxygen for boosting an arc-blowing pressure in the arcing zone.

33. The circuit breaker according to claim 31 , wherein the ejection device comprises an additional compartment in which the auxiliary injection compound is contained and which has an ejection orifice through which the auxiliary injection compound is to be ejected.

34. The circuit breaker according to claim 31 , wherein the auxiliary injection compound is to be injected directly into an arcing zone of the circuit breaker via an auxiliary injection channel.

35. The circuit breaker according to claim 34 , wherein the auxiliary injection channel is arranged in close proximity to the arcing zone such that temperatures of the auxiliary compound above 2000 K are achievable when the auxiliary compound is injected into the auxiliary injection channel during a contact-opening operation of the circuit breaker.

36. The circuit breaker according to claim 31 , wherein the auxiliary injection compound is to be injected indirectly into the arcing zone via a or the heating volume and/or compression volume and/or via an auxiliary volume.

37. The circuit breaker according to claim 36 , wherein the auxiliary volume is arranged in close proximity to the arcing zone such that temperatures of the auxiliary compound above 2000 K are achievable when the auxiliary compound is injected into the auxiliary volume during a contact-opening operation of the circuit breaker.

38. The circuit breaker according to claim 36 , wherein the auxiliary volume is fluidly connected via an auxiliary intermediate channel, an auxiliary opening or an auxiliary valve to a or the heating volume and/or compression chamber for transmitting the auxiliary compound to the arcing zone.

39. The circuit breaker according to claim 31 , wherein timing means for timed injection of the auxiliary compound into the arcing zone are present such that the boosting of the arc-blowing pressure occurs in a time window of less than 15 ms.

40. A gas-insulated switchgear, comprising a circuit breaker according to claim 1 .

41. A method for improved circuit breaker operation in a circuit breaker, in particular for improved extinguishing of an arc and/or for improved cooling of exhaust gases formed in a circuit breaker, wherein a liquid arc-extinction medium and/or liquid exhaust-cooling medium comprises an organofluorine compound having a boiling point Tb at 1 bar higher than −60° C. and being selected from the group consisting of: a fluoroether; a fluoroamine; a fluoroketone; and mixtures thereof, comprising the step of:

injecting the liquid arc-extinction medium and/or liquid exhaust-cooling medium into an injection zone of the circuit breaker.

42. The method according to claim 41 , wherein the organofluorine compound is a fluoroketone or mixture of fluoroketones, wherein the fluoroketone or mixture of fluoroketones is or are injected into a heating volume and/or compression chamber of the circuit breaker for improved extinguishing of an arc formed in the circuit breaker.

43. The method according to claim 41 , wherein the organofluorine compound is a fluoroketone or mixture of fluoroketones, wherein the fluoroketone or mixture of fluoroketones is or are injected into an exhaust volume of the circuit breaker for improved cooling of exhaust gases in the circuit breaker.

44. The circuit breaker according to claim 2 , wherein the organofluorine compound has a boiling point Tb at 1 bar higher than −10°.

45. The circuit breaker according to claim 2 , wherein the organofluorine compound has a boiling point Tb at 1 bar higher than +5° C.

46. The circuit breaker according to claim 2 , wherein the organofluorine compound has a boiling point Tb at 1 bar higher than +20° C.

47. The circuit breaker according to claim 2 , wherein the organofluorine compound has a boiling point Tb at 1 bar higher than +40° C.

48. The circuit breaker according to claim 2 , wherein the organofluorine compound has a boiling point Tb at 1 bar higher than +65° C.

49. The circuit breaker according to claim 2 , wherein the organofluorine compound has a boiling point Tb at 1 bar higher than +90° C.

50. The circuit breaker according to claim 10 , wherein the fluoromonoketone contains from 5 to 9 carbon atoms.

51. The circuit breaker according to claim 10 , wherein the fluoromonoketone contains exactly 5 or exactly 6 or exactly 7 or exactly 8 carbon atoms.

52. The circuit breaker according to claim 11 , wherein 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.

53. The circuit breaker according to claim 11 , wherein 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.

54. The circuit breaker according to claim 12 , wherein the ejection device is designed such that the arc-extinction medium and/or exhaust-cooling medium is ejected during an ejection time in a range from 5 ms to 15 ms.

55. The circuit breaker according to claim 12 , wherein the ejection device is designed such that the arc-extinction medium and/or exhaust-cooling medium is ejected during an ejection time of about 10 ms.

56. 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, in particular argon, and mixtures thereof.

57. The circuit breaker according to claim 15 , wherein at least two orifices are present and open out into at least two of: an arcing zone, an injection zone with lower pressure than in the arcing zone, a heating volume, a compression chamber, and an exhaust volume.

58. The circuit breaker according to claim 16 , further comprising a floating piston which is designed to transmit a compressing force onto the interior of the compartment during a breaker operation.

59. The circuit breaker according to claim 39 , wherein the boosting of the arc-blowing pressure occurs in a time window of less than 10 ms.

60. The circuit breaker according to claim 39 , wherein the boosting of the arc-blowing pressure occurs in a time window of less than 5 ms.

61. The circuit breaker according to claim 39 , wherein the boosting of the arc-blowing pressure occurs in a time window of less than 3 ms.

62. The circuit breaker according to claim 39 , wherein the boosting of the arc-blowing pressure occurs around a time instant when current-zero occurs.

63. The circuit breaker according to claim 32 , wherein the ejection device comprises an additional compartment in which the auxiliary injection compound is contained and which has an ejection orifice through which the auxiliary injection compound is to be ejected.

64. The circuit breaker according to claim 33 , wherein the auxiliary injection compound is to be injected directly into an arcing zone of the circuit breaker via an auxiliary injection channel.

65. The circuit breaker according to claim 35 , wherein the auxiliary injection compound is to be injected indirectly into the arcing zone via a or the heating volume and/or compression volume and/or via an auxiliary volume.

66. The method according to claim 42 , wherein the organofluorine compound is a fluoroketone or mixture of fluoroketones, wherein the fluoroketone or mixture of fluoroketones is or are injected into an exhaust volume of the circuit breaker for improved cooling of exhaust gases in the circuit breaker.