US4052555A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gaseous dielectric compositions
Assignee: Honeywell International Inc
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Filing: 1975-07-23
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Granted: 1977-10-04
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Expires: 1995-07-23
Abstract
Abstract Perfluorinated ethers evidence useful properties as gaseous dielectrics and do not exhibit a high carbon tracking tendency, which is commonly a problem with halogenated alkanes. Mixtures of the perfluorinated ethers with SF 6 and/or CO 2 , in critical proportions which are specific to each system, evidence improved dielectric breakdown voltages. The perfluorinated ethers and mixtures of the perfluorinated ethers with SF 6 and/or CO 2 are useful in high voltage coaxial lines, transformers, minisubstations, and the like.
Inventors
- 👤 Whitney H. Mears
- 👤 Sabatino R. Orfeo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:34
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/02; H01B3/16; H01H; H01H33/00; H01H33/02; H01H33/04; H01H33/22
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
95 words
A process for substantially eliminating carbon tracking formation in a dielectric fluid during an electrical discharge from an electrical conductor which comprises maintaining in contact with the electrical conductor during operation a gaseous dielectric composition consisting essentially of a mixture of at least one perfluorinated ether with from about 1 to 99 mole percent of SF 6 and/or with from about 1 to 75 mole percent of CO 2 , said perfluorinated ether containing from 2 to 6 carbon atoms and having a vapor pressure of at least of about 100 Torr at 20° C.
Claim 2
Dependent Claim
95 words
A process for substantially eliminating carbon tracking formation in a dielectric fluid during an electrical discharge from an electrical conductor which comprises maintaining in contact with the electrical conductor during operation a gaseous dielectric composition consisting essentially of a mixture of at least one perfluorinated ether with from about 1 to 99 mole percent of SF 6 and/or with from about 1 to 75 mole percent of CO 2 , said perfluorinated ether containing from 2 to 6 carbon atoms and having a vapor pressure of at least of about 100 Torr at 20° C.
Claim 3
Dependent Claim
23 words
The process of claim 1 in which the perfluorinated ether has a vapor pressure of at least about 400 Torr at 20° C.
Claim 4
Dependent Claim
27 words
The process of claim 1 in which the perfluorinated ether is totally gaseous at room temperature and has a boiling point of less than about 5° C.
Claim 5
Dependent Claim
36 words
The process of claim 1 in which the perfluorinated ether consists essentially of at least one compound selected from the group consisting of (CF 3 ) 2 O and (C 2 F 5 ) 2 O.
Claim 6
Dependent Claim
34 words
The process of claim 1 in which the gaseous dielectric composition consists essentially of a mixture of at least one perfluorinated ether with from about 1 to 99 mole percent of SF 6 .
Claim 7
Dependent Claim
34 words
The process of claim 1 in which the gaseous dielectric composition consists essentially of a mixture of at least one perfluorinated ether with from about 1 to 75 mole percent of CO 2 .
Claim 8
Dependent Claim
121 words
A process for substantially eliminating carbon tracking formation and for improving dielectric strength in a dielectric fluid during an electrical discharge from an electrical conductor which comprises maintaining in contact with the electrical conductor during operation a gaseous dielectric composition consisting essentially of at least one mixture selected from the group consisting of SF 6 --(C 2 F 5 ) 2 O over the range of about 1 to 55 mole percent of SF 6 , CO 2 --(CF 3 ) 2 O over the range of about 1 to 45 mole percent of CO 2 , and CO 2 --(C 2 F 5 ) 2 O over the range of about 1 to 50 mole percent of CO 2 .
Claim 9
Dependent Claim
121 words
A process for substantially eliminating carbon tracking formation and for improving dielectric strength in a dielectric fluid during an electrical discharge from an electrical conductor which comprises maintaining in contact with the electrical conductor during operation a gaseous dielectric composition consisting essentially of at least one mixture selected from the group consisting of SF 6 --(C 2 F 5 ) 2 O over the range of about 1 to 55 mole percent of SF 6 , CO 2 --(CF 3 ) 2 O over the range of about 1 to 45 mole percent of CO 2 , and CO 2 --(C 2 F 5 ) 2 O over the range of about 1 to 50 mole percent of CO 2 .
Claim 10
Dependent Claim
86 words
A composition for substantially eliminating carbon tracking formation, characterized in that the composition consists essentially of a mixture of at least one perfluorinated ether and a member selected from the group consisting of about 1 to 99 mole percent of SF 6 and about 1 to 99 mole percent of SF 6 plus about 1 to 75 mole percent of CO 2 , said perfluorinated ether having from 2 to 6 carbon atoms and a vapor pressure of at least about 100 Torr at 20° C.
Claim 11
Dependent Claim
86 words
A composition for substantially eliminating carbon tracking formation, characterized in that the composition consists essentially of a mixture of at least one perfluorinated ether and a member selected from the group consisting of about 1 to 99 mole percent of SF 6 and about 1 to 99 mole percent of SF 6 plus about 1 to 75 mole percent of CO 2 , said perfluorinated ether having from 2 to 6 carbon atoms and a vapor pressure of at least about 100 Torr at 20° C.
Claim 12
Dependent Claim
23 words
The composition of claim 8 in which the vapor pressure of the perfluorinated ether is at least about 400 Torr at 20° C.
Claim 13
Dependent Claim
31 words
The composition of claim 8 in which the vapor pressure of the perfluorinated ether is totally gaseous at room temperature and has a boiling point of less than about 5° C.
Claim 14
Dependent Claim
36 words
The composition of claim 8 in which the perfluorinated ether consists essentially of at least one compound selected from the group consisting of (CF 3 ) 2 O and (C 2 F 5 ) 2 O.
Claim 15
Dependent Claim
105 words
In combination: a. electrical apparatus having a chamber in which electric arcing occasionally occurs and in which dielectric strength is maintained; and b. a gaseous dielectric composition in said chamber for substantially eliminating carbon tracking formation and for electrical and insulating purposes, said gaseous dielectric composition consisting essentially of a mixture of at least one perfluorinated ether with from about 1 to 99 mole percent of SF 6 and/or with from about 1 to 75 mole percent of CO 2 , said perfluorinated ether containing from 2 to 6 carbon atoms and having a vapor pressure of at least about 100 Torr at 20° C.
Claim 16
Dependent Claim
105 words
In combination: a. electrical apparatus having a chamber in which electric arcing occasionally occurs and in which dielectric strength is maintained; and b. a gaseous dielectric composition in said chamber for substantially eliminating carbon tracking formation and for electrical and insulating purposes, said gaseous dielectric composition consisting essentially of a mixture of at least one perfluorinated ether with from about 1 to 99 mole percent of SF 6 and/or with from about 1 to 75 mole percent of CO 2 , said perfluorinated ether containing from 2 to 6 carbon atoms and having a vapor pressure of at least about 100 Torr at 20° C.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-10-03 | 1981-04-04 | 1981-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-03 | 1985-04-04 | 1985-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-03 | 1989-04-04 | 1989-10-04 | $7700.00 | Window Closed / Lapsed |