Dielectric insulation medium

Patent metadata

Field	Value
Publication number	US-9928973-B2
Application number	US-201414192224-A
Country	US
Kind code	B2
Filing date	Feb 27, 2014
Priority date	Jun 12, 2009
Publication date	Mar 27, 2018
Grant date	Mar 27, 2018

Abstract

A dielectric insulation medium. The insulation medium is characterized in that it comprises a fluoroketone having from 4 to 12 carbon atoms.

First claim

What is claimed is:

1. A dielectric insulation medium comprising an insulation gas, said insulation gas comprising at operational conditions a fluoroketone having from 4 to 12 carbon atoms, characterized in that the fluoroketone has a boiling point of at least −5° C. at ambient pressure, the insulation gas is a gas mixture which comprises oxygen mixed with carbon dioxide and/or nitrogen, and a molar percentage of the fluoroketone in the insulation gas is at least 10%.

2. The insulation medium according to claim 1 , characterized in that the fluoroketone has the general structure
R1-CO—R2

wherein R1 and R2 are at least partially fluorinated chains, said chains being independently from each other linear or branched and having from 1 to 10 carbon atoms.

3. The insulation medium according to claim 1 , characterized in that the fluoroketone has from 4 to 10 carbon atoms.

4. The insulation medium according to claim 1 , characterized in that the fluoroketone has from 4 to 8 carbon atoms.

5. The insulation medium according to claim 3 , characterized in that the fluoroketone has 6 carbon atoms.

6. The insulation medium according to claim 5 , characterized in that the fluoroketone is dodecafluoro-2-methylpentan-3-one.

7. The insulation medium according to claim 1 , characterized in that the molar percentage of the fluoroketone in the insulation gas is at least 15%.

8. An apparatus for the generation, the distribution and the usage of electrical energy, said apparatus comprising a housing defining an insulating space and an electrical active part arranged in the insulating space, said insulating space comprising the dielectric insulation medium according to claim 1 .

9. The apparatus according to claim 8 , the insulation gas pressure being, during operation of the apparatus, in a range from 1 bar to 1.5 bar.

10. The apparatus according to claim 8 , the partial pressure of the fluoroketone being at least 0.6 bar.

11. The apparatus according to claim 10 , the partial pressure of the fluoroketone being at least 0.9 bar.

12. The apparatus according to claim 8 , said apparatus being a medium or high voltage apparatus.

13. The apparatus according to claim 8 , said apparatus being a switchgear, in particular an encapsulated switchgear, more particularly an air-insulated or gas-insulated switchgear or a part or component thereof.

14. The apparatus according to claim 13 , the apparatus being a bus bar, a bushing, a cable, a gas-insulated cable, a cable joint, a current transformer, a voltage transformer, a surge arrester, an earthing switch, a disconnector, a load-break switch, and/or a circuit breaker.

15. The apparatus according to claim 8 , the apparatus being a switch, in particular an earthing switch, more particularly a fast acting earthing switch, a disconnector, a load-break switch or a circuit breaker, in particular a medium-voltage circuit breaker, a generator circuit breaker and/or a high-voltage circuit breaker.

16. The apparatus according to claim 8 , the apparatus being a distribution transformer or a power transformer.

17. A dielectric insulation medium comprising an insulation gas, said insulation gas comprising at operational conditions a fluoroketone having from 4 to 10 carbon atoms and having the general structure
R1-CO—R2

wherein R1 and R2 are at least partially fluorinated chains, said chains being independently from each other linear or branched and having from 1 to 10 carbon atoms, characterized in that the fluoroketone has a boiling point of at least −5° C. at ambient pressure, the insulation gas is a gas mixture which comprises oxygen mixed with carbon dioxide and/or nitrogen, and a molar percentage of the fluoroketone in the insulation gas is at least 10%.

18. The insulation medium according to claim 17 , characterized in that the fluoroketone has from 4 to 8 carbon atoms.

19. The insulation medium according to claim 17 , characterized in that the fluoroketone has 6 carbon atoms.

20. The insulation medium according to claim 17 , characterized in that the molar percentage of the fluoroketone in the insulation gas is at least 15%.

21. The insulation medium according to claim 17 , characterized in that the fluoroketone is a perfluorinated ketone having the molecular formula C 6 F 12 O.

22. The insulation medium according to claim 17 , characterized in that the molar percentage of the fluoroketone in the insulation gas is at least 15%.

Assignees

• Claessens Max Steffen
• Skarby Per
• Abb Technology Ag

Inventors

• Claessens Max-Steffen
• Skarby Per

Classifications

• H01H33/56

  Gas reservoirs · CPC title

• H01H11/00

  Apparatus or processes specially adapted for the manufacture of electric switches (processes specially adapted for manufacture of rectilinearly movable switches having a plurality of operating members associated with different sets of contacts, e.g. keyboards, H01H13/88) · CPC title

• H01H9/02 Primary

  Bases, casings, or covers (accommodating more than one switch or a switch and another electrical component H02B1/26) · CPC title

• H01B3/56 Primary

  gases · CPC title

• H02B13/055 Primary

  Features relating to the gas · CPC title