Encapsulated switchgear

1. An encapsulated switchgear comprising a housing defining an insulating space and an electrical active part arranged in the insulating space, said insulating space comprising an insulation medium, characterized in that the insulation medium comprises a dielectric compound having a boiling point of above −25° C. and being a fluoroketone having from 4 to 12 carbon atoms.

2. The encapsulated switchgear according to claim 1 , the dielectric compound having a boiling point of above −20° C.

3. The encapsulated switchgear according to claim 2 , characterized in that the fluoroketone has from 4 to 10 carbon atoms.

4. The encapsulated switchgear according to claim 3 , characterized in that the fluoroketone is a perfluorinated ketone having the molecular formula C 6 F 12 O.

5. The encapsulated switchgear according to claim 1 , characterized in that at operational conditions the insulation medium comprises an insulation gas comprising a gaseous part of the dielectric compound, said gaseous part being in equilibrium with a liquid part of the dielectric compound.

6. The encapsulated switchgear according to claim 5 , characterized in that the insulation gas is a gas mixture, which further comprises a carrier gas.

7. The encapsulated switchgear according to claim 6 , characterized in that the carrier gas comprises air or at least comprises one air component.

8. The encapsulated switchgear according to claim 5 , characterized in that it comprises a receptacle designed for comprising at least a portion of the liquid part of the dielectric compound comprised in the housing.

9. The encapsulated switchgear according to claim 8 , characterized in that it further comprises collecting means for collecting at least a portion of the liquid part of the dielectric compound and transferring it to the receptacle.

10. The encapsulated switchgear according to claim 5 , characterized in that it further comprises an indicator for determining the amount of the liquid part of the dielectric compound in the insulating space, said indicator being arranged in a space separate from the insulating space and being connected with the receptacle.

11. The encapsulated switchgear according to claim 8 , the housing comprising a transparent area allowing the receptacle and/or the indicator, respectively, to be viewed from the outside.

12. The encapsulated switchgear according to claim 1 , the switchgear being a metal-encapsulated switchgear.

13. The encapsulated switchgear according to claim 1 , the switchgear being a medium voltage encapsulated switchgear.

14. An encapsulated switchgear comprising a housing defining an insulating space and an electrical active part arranged in the insulating space, said insulating space comprising an insulation medium comprising a dielectric compound having a boiling point of above −25° C., characterized in that at operational conditions the insulation medium comprises an insulation gas comprising a gaseous part of the dielectric compound, said gaseous part being in equilibrium with a liquid part of the dielectric compound.

15. The encapsulated switchgear according to claim 14 , the dielectric compound having a boiling point of above −20° C.

16. The encapsulated switchgear according to claim 14 , characterized in that the dielectric compound is a fluoroketone having from 4 to 12 carbon atoms.

17. The encapsulated switchgear according to claim 16 , characterized in that the fluoroketone has from 4 to 10 carbon atoms.

18. The encapsulated switchgear according 17 , characterized in that the fluoroketone is a perfluorinated ketone having the molecular formula C 6 F 12 O.

19. The encapsulated switchgear according to claim 18 , characterized in that the insulation gas is a gas mixture, which further comprises a carrier gas.

20. The encapsulated switchgear according to claim 19 , characterized in that the carrier gas comprises air or at least comprises one air component.

21. The encapsulated switchgear according to claim 14 , characterized in that it comprises a receptacle determined for comprising at least a portion of the liquid part of the dielectric compound comprised in the housing.

22. The encapsulated switchgear according to claim 21 , characterized in that it further comprises collecting means for collecting at least a portion of the liquid part of the dielectric compound and transferring it to the receptacle.

23. The encapsulated switchgear according to claim 14 , characterized in that it further comprises an indicator for determining the amount of the liquid part of the dielectric compound in the insulating space, said indicator being arranged in a space separate from the insulating space and being connected with the receptacle.

24. The encapsulated switchgear according to claim 21 , the housing comprising a transparent area allowing the receptacle and/or the indicator, respectively, to be viewed from the outside.

25. The encapsulated switchgear according to claim 14 , the switchgear being a metal-encapsulated switchgear.

26. The encapsulated switchgear according to claim 14 , the switchgear being a medium voltage encapsulated switchgear.

27. An encapsulated switchgear comprising a housing defining an insulating space and an electrical active part arranged in the insulating space, said insulating space comprising an insulation medium, characterized in that the insulation medium comprises a dielectric compound having a boiling point of above −5° C and characterized in that the dielectric compound is a fluoroketone having from 4 to 12 carbon atoms.

28. The encapsulated switchgear according to claim 27 , characterized in that the fluoroketone has from 4 to 10 carbon atoms.

29. The encapsulated switchgear according 28 , characterized in that the fluoroketone is a perfluorinated ketone having the molecular formula C 6 F 12 O.

30. The encapsulated switchgear according to claim 27 , characterized in that at operational conditions the insulation medium comprises an insulation gas comprising a gaseous part of the dielectric compound, said gaseous part being in equilibrium with a liquid part of the dielectric compound.

31. The encapsulated switchgear according to claim 30 characterized in that the insulation gas is a gas mixture, which further comprises a carrier gas.

32. The encapsulated switchgear according to claim 31 , characterized in that the carrier gas comprises air or at least comprises one air component.

33. The encapsulated switchgear according to claim 31 , characterized in that it comprises a receptacle determined for comprising at least a portion of the liquid part of the dielectric compound comprised in the housing.

34. The encapsulated switchgear according to claim 33 , characterized in that it further comprises collecting means for collecting at least a portion of the liquid part of the dielectric compound and transferring it to the receptacle.

35. The encapsulated switchgear according to claim 30 , characterized in that it further comprises an indicator for determining the amount of the liquid part of the dielectric compound in the insulating space, said indicator being arranged in a space separate from the insulating space and being connected with the receptacle.

36. The encapsulated switchgear according to claim 33 , the housing comprising a transparent area allowing the receptacle and/or the indicator, respectively, to be viewed from the outside.

37. The encapsulated switchgear according to claim 1 , the switchgear being a metal-encapsulated switchgear.

38. The encapsulated switchgear according to claim 1 , the switchgear being a medium voltage encapsulated switchgear.

39. A process for providing an encapsulated switchgear according to claim 5 by introducing a dielectric compound into the insulating space of the switchgear, wherein the amount of the dielectric compound introduced is such that at operational conditions the insulation medium comprises an insulation gas comprising a gaseous part of the dielectric compound, said gaseous part being in equilibrium with a liquid part of the dielectric compound.

40. The process according to claim 39 , wherein the dielectric compound is introduced in liquid form, whereupon only a part of the dielectric compound evaporates into the insulating space.

41. The process according to claim 40 , wherein the dielectric compound is introduced into the bottom part of the insulating space.

42. A method of providing an insulation medium for an encapsulated switchgear, comprising the step of utilizing a dielectric compound having a boiling point of above −25° C. in said insulation medium for the encapsulated switchgear, said insulation medium comprising at operational conditions an insulation gas comprising a gaseous part of the dielectric compound, said gaseous part being in equilibrium with a liquid part of the dielectric compound.

43. The method according to claim 42 of a dielectric compound having a boiling point of above −20° C.

44. The method according to claim 42 of a dielectric compound having a boiling point of above −5° C.

45. The encapsulated switchgear according to claim 1 , the dielectric compound having a boiling point of above −5° C.

46. The encapsulated switchgear according to claim 2 , characterized in that the fluoroketone has from 4 to 8 carbon atoms.

47. The encapsulated switchgear according to claim 2 , characterized in that the fluoroketone has 6 carbon atoms.

48. The encapsulated switchgear according to claim 3 , characterized in that the fluoroketone is dodecafluoro-2-methylpentan-3-one.

49. The encapsulated switchgear according to claim 14 , the dielectric compound having a boiling point of above −5° C.

50. The encapsulated switchgear according to claim 16 , characterized in that the fluoroketone has from 4 to 8 carbon atoms.

51. The encapsulated switchgear according to claim 16 , characterized in that the fluoroketone has 6 carbon atoms.

52. The encapsulated switchgear according 17 , characterized in that the fluoroketone is dodecafluoro-2-methylpentan-3-one.

53. The encapsulated switchgear according to claim 27 , characterized in that the fluoroketone has from 4 to 8 carbon atoms.

54. The encapsulated switchgear according to claim 27 , characterized in that the fluoroketone has 6 carbon atoms.

55. The encapsulated switchgear according to claim 28 , characterized in that the fluoroketone is dodecafluoro-2-methylpentan-3-one.

56. The encapsulated switchgear according to claim 7 , characterized in that the at least one air component is selected from the group consisting of carbon dioxide, oxygen and nitrogen.

57. The encapsulated switchgear according to claim 20 , characterized in that the at least one air component is selected from the group consisting of carbon dioxide, oxygen and nitrogen.

58. The encapsulated switchgear according to claim 32 , characterized in that the at least one air component is selected from the group consisting of carbon dioxide, oxygen and nitrogen.

59. A process for providing an encapsulated switchgear according to claim 30 by introducing a dielectric compound into the insulating space of the switchgear, wherein the amount of the dielectric compound introduced is such that at operational conditions the insulation medium comprises an insulation gas comprising a gaseous part of the dielectric compound, said gaseous part being in equilibrium with a liquid part of the dielectric compound.