Fluorinated Nitriles as Dielectric Gases

• US 20150083979A1
• Filed: 03/15/2013
• Published: 03/26/2015
• Est. Priority Date: 04/04/2012
• Status: Abandoned Application

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Costello, Michael G., Flynn, Richard M., Bulinski, Michael J.
• Application Number:
  US14/388,301
• Publication Number:
  US 20150083979A1
• Time in Patent Office: Days
• US Class Current: 252/571
• CPC Class Codes: H01B 3/16 gases
• CPC Class Codes: H01B 3/24 containing halogen in the molecules, e.g. halogenated oils
• CPC Class Codes: H01B 3/56 gases

Abstract

An electrical device containing a dielectric fluid, the dielectric fluid comprising heptafluoroisobutyronitrile or 2,3,3,3-tetrafluoro-2-(trifluoromethoxy) propanenitrile.

Claims

1. An electrical device comprising a dielectric fluid according to the formula:

(i) (CF₃)₂CFCN;

or (ii) CF₃CF(OCF₃)CN.

2. The electrical device of claim 1, further comprising a reservoir, wherein the reservoir contains an amount of the dielectric fluid in liquid form.

3. The electrical device of claim 1, wherein the electrical device is selected from the group consisting of:

gas-insulated circuit breakers, current-interruption equipment, gas-insulated transmission lines, gas-insulated transformers, and gas-insulated substations.

4. The electrical device of claim 1, further comprising a second dielectric fluid having a vapor pressure of at least about 70 kPa at 0°

C.

5. The electrical device of claim 4, wherein the second dielectric gas is selected from nitrogen, carbon dioxide, nitrous oxide (N₂O), helium, argon, air or a perfluoroalkane.

6. A dielectric composition comprising:

a fluid according to the formula;

(i) (CF₃)₂CFCN,or (ii) CF₃CF(OCF₃)CN; and

a gaseous dielectric comprising an inert gas having a vapor pressure of at least about 70 kPa at 0°

C.

7. The dielectric composition of claim 6, wherein a ratio of the vapor pressure of the gaseous dielectric to the fluid is at least about 2.5:

1.

8. The dielectric composition of claim 6, wherein the inert gas is selected from nitrogen, carbon dioxide, nitrous oxide (N₂O), helium, air and argon.

9. A dielectric composition for use in an electrical device as an insulator, comprising:

a fluid according to the formula;

(i) (CF₃)₂CFCN, or (ii) CF₃CF(OCF₃)CN.

10. The dielectric composition of claim 9, further comprising a dielectric gas having a vapor pressure of at least about 70 kPa at 0°

C.

11. The dielectric composition of claim 10, wherein a ratio of the vapor pressure of the dielectric gas to the fluid is at least about 2.5:

1.