Patent US4175048A successfully refreshed from Google Patents.
US4175048A
Expired / Lapsed
US
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Gaseous insulators for high voltage electrical equipment
Assignee: United States Department of Energy
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Filing: 1977-09-06
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Granted: 1979-11-20
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Expires: 1997-09-06
Abstract
Abstract Gaseous insulators comprise compounds having high attachment cross sections for electrons having energies in the 0-1.3 electron volt range. Multi-component gaseous insulators comprise compounds and mixtures having overall high electron attachment cross sections in the 0-1.3 electron volt range and moderating gases having high cross sections for inelastic interactions with electrons of energies 1-4 electron volts. Suitable electron attachment components include hexafluorobutyne, perfluorobutene-2, perfluorocyclobutane, perfluorodimethylcyclobutane, perfluorocyclohexene, perfluoromethylcyclohexane, hexafluorobutadiene, perfluoroheptene-1 and hexafluoroazomethane. Suitable moderating gases include N2, CO, CO2 and H2. The gaseous insulating mixture can also contain SF6, perfluoropropane and perfluorobenzene.
Inventors
- 👤 Loucas G. Christophorou
- 👤 David R. James
- 👤 Marshall O. Pace
- 👤 Robert Y. Pai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:29
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/56; H02; H02B; H02B13/00; H02B13/02; H02B13/035; H02B13/055
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
39 words
Apparatus comprising a gas-tight casing, spaced electrical elements therein adapted to be subjected to differences of electrical potential, and a gaseous insulator between said elements, said gaseous insulator comprising a compound selected from the group of perfluorocyclohexene and hexafluoroazomethane.
Claim 2
Dependent Claim
39 words
Apparatus comprising a gas-tight casing, spaced electrical elements therein adapted to be subjected to differences of electrical potential, and a gaseous insulator between said elements, said gaseous insulator comprising a compound selected from the group of perfluorocyclohexene and hexafluoroazomethane.
Claim 3
Dependent Claim
43 words
The apparatus of claim 1 in which said gaseous insulator further comprises a gas selected from the group of SF 6 , N 2 , CO, CO 2 , H 2 , C 3 F 8 , and C 6 F 6 .
Claim 4
Dependent Claim
15 words
The apparatus of claim 2 in which gaseous insulator comprises hexafluoroazomethane and N 2 .
Claim 5
Dependent Claim
12 words
The apparatus of claim 1 in which said gaseous insulator comprises hexafluoroazomethane.
Claim 6
Dependent Claim
12 words
The apparatus of claim 1 in which said gaseous insulator comprises perfluorocyclohexene.
Claim 7
Dependent Claim
37 words
The apparatus of claim 1 in which said gaseous insulator also comprises a gas selected from the group of N 2 , CO, H 2 , C 3 F 8 , and C 6 F 6 .
Claim 8
Dependent Claim
48 words
Apparatus comprising a gas-tight casing, spaced electrical elements therein adapted to be subjected to differences of electrical potential and a gaseous insulator between said elements, said gaseous insulator comprising a synergistic mixture comprising by volume at least 50% N 2 , 10-30% hexafluoro-2-butyne, and 10-20% SF 6 .
Claim 9
Dependent Claim
48 words
Apparatus comprising a gas-tight casing, spaced electrical elements therein adapted to be subjected to differences of electrical potential and a gaseous insulator between said elements, said gaseous insulator comprising a synergistic mixture comprising by volume at least 50% N 2 , 10-30% hexafluoro-2-butyne, and 10-20% SF 6 .
Claim 10
Dependent Claim
28 words
The apparatus of claim 7 in which said gaseous insulator consists essentially of 60% N 2 , 20% 10% SF 6 and 10% C 3 F 8 .
Claim 11
Dependent Claim
21 words
The apparatus of claim 7 in which said gaseous insulator comprises 50% N 2 , 30% and 20% SF 6 .
Claim 12
Independent Claim
81 words
An apparatus comprising a gas-tight casing, spaced electrical elements therein adapted to be subjected to differences of electrical potential, and a gaseous insulator between said elements, said gaseous insulator comprising a synergistic mixture comprising a first component selected from the group of perfluorodimethylcyclobutane, perfluorocyclohexene, hexafluoroazomethane, perfluoromethylcyclohexane, hexafluorobutadiene, perfluoroheptene-1, perfluorocyclobutane, perfluorobutene-2 and mixtures thereof and a second component selected from the group of N 2 , CO, H 2 , C 3 F 8 , C 6 F 6 and mixtures thereof.
Claim 13
Independent Claim
81 words
An apparatus comprising a gas-tight casing, spaced electrical elements therein adapted to be subjected to differences of electrical potential, and a gaseous insulator between said elements, said gaseous insulator comprising a synergistic mixture comprising a first component selected from the group of perfluorodimethylcyclobutane, perfluorocyclohexene, hexafluoroazomethane, perfluoromethylcyclohexane, hexafluorobutadiene, perfluoroheptene-1, perfluorocyclobutane, perfluorobutene-2 and mixtures thereof and a second component selected from the group of N 2 , CO, H 2 , C 3 F 8 , C 6 F 6 and mixtures thereof.
Claim 14
Independent Claim
86 words
An apparatus comprising a gas-tight casing, spaced electrical elements therein adapted to be subjected to differences of electrical potential, and a gaseous insulator between said elements, said gaseous insulator comprising a synergistic mixture comprising a first component selected from the group of perfluorodimethylcyclobutane, perfluorocyclohexene, hexafluoroazomethane, perfluoromethylcyclohexane, hexafluorobutadiene, perfluoroheptene-1, perfluorobutene-2 and mixtures thereof and a second component selected from the group of SF 6 , N 2 , CO, CO 2 , H 2 , C 3 F 8 , C 6 F 6 and mixtures thereof.
Claim 15
Independent Claim
86 words
An apparatus comprising a gas-tight casing, spaced electrical elements therein adapted to be subjected to differences of electrical potential, and a gaseous insulator between said elements, said gaseous insulator comprising a synergistic mixture comprising a first component selected from the group of perfluorodimethylcyclobutane, perfluorocyclohexene, hexafluoroazomethane, perfluoromethylcyclohexane, hexafluorobutadiene, perfluoroheptene-1, perfluorobutene-2 and mixtures thereof and a second component selected from the group of SF 6 , N 2 , CO, CO 2 , H 2 , C 3 F 8 , C 6 F 6 and mixtures thereof.
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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) | 1982-11-19 | 1983-05-21 | 1983-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-11-19 | 1987-05-21 | 1987-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-11-19 | 1991-05-21 | 1991-11-20 | $7700.00 | Window Closed / Lapsed |