US3845233A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressurized insulant of solid and fluid for a conductor
Assignee: Dielectrics International Ltd
•
Filing: 1973-02-12
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Granted: 1974-10-29
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Expires: 1993-02-12
Abstract
Abstract Electrical equipment has a conductive member surrounded by an insulant. The insulant comprises finely divided particles of a solid insulating material in an insulating fluid, which fluid acts as a discharge suppressant and is effectively in the form of a thin film. Means are provided for maintaining the fluid above atmospheric pressure and for maintaining the interparticle pressure.
Inventors
- 👤 E Burton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:58
CPC Classifications
H; H01; H01F; H01F38/00; H01F38/20; H01F38/22; H01F38/28; H01B; H01B13/00; H01B13/06; H01B13/30; H01B17/00; H01B17/26; H01B7/00; H01B7/02; H01F27/00; H01F27/28; H01F27/32; H01F27/321; H02; H02G; H02G15/00; H02G15/20; H02G15/24; H02G15/25
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
132 words
Electrical equipment comprising: a conductive member; an insulant surrounding said conductive member; said insulant comprising finely divided particles of a solid insulating material in an insulating fluid, said insulating fluid acting as a discharge suppressant; first pressure applying means for applying pressure to said insulating fluid to maintain said insulating fluid at above atmospheric pressure, said first pressure applying means including a fluid passage means for placing the insulating fluid in fluid flow communication with a source of pressurized fluid, said fluid passage means being permeable to said insulating fluid and impermeable to said solid insulating material; and second pressure applying means for applying pressure to said solid insulating material to maintain interparticle pressure to inhibit particle movement and prevent particle sedimentation and thereby maintain the insulating fluid as a thin film.
Claim 2
Dependent Claim
132 words
Electrical equipment comprising: a conductive member; an insulant surrounding said conductive member; said insulant comprising finely divided particles of a solid insulating material in an insulating fluid, said insulating fluid acting as a discharge suppressant; first pressure applying means for applying pressure to said insulating fluid to maintain said insulating fluid at above atmospheric pressure, said first pressure applying means including a fluid passage means for placing the insulating fluid in fluid flow communication with a source of pressurized fluid, said fluid passage means being permeable to said insulating fluid and impermeable to said solid insulating material; and second pressure applying means for applying pressure to said solid insulating material to maintain interparticle pressure to inhibit particle movement and prevent particle sedimentation and thereby maintain the insulating fluid as a thin film.
Claim 3
Dependent Claim
34 words
The electrical equipment as claimed in claim 1 and further comprising an impermeable membrane surrounding the insulant, the insulant supportiNg the conductive member in spaced relationship with respect to said surrounding impermeable membrane member.
Claim 4
Dependent Claim
39 words
The electrical equipment claimed in claim 1 and further comprising an impermeable membrane surrounding the insulant, the second pressure applying means being in contact with said surrounding impermeable membrane and applying pressure to the particles through the impermeable membrane.
Claim 5
Dependent Claim
46 words
Electrical equipment as claimed in claim 1 wherein said conductive member is a stranded hollow conductor, said hollow conductor including pressurized insulating fluid, said fluid passage means comprising a fluid permeable membrane surrounding said conductor, and further comprising a first impermeable membrane which surrounds the insulant.
Claim 6
Dependent Claim
42 words
Electrical equipment as claimed in claim 4 wherein the second pressure applying means comprises a second impermeable membrane which surrounds and is spaced from the first impermeable membrane, and fluid under pressure in the space between the first and second impermeable membranes.
Claim 7
Dependent Claim
24 words
Electrical equipment as claimed in claim 4 wherein the second pressure applying means comprises metal tape under tension wound around the first impermeable membrane.
Claim 8
Dependent Claim
120 words
Electrical equipment as claimed in claim 1 in the form of a bushing and further comprising a casing surrounding the conductive member and spaced therefrom, a corona shield of sheet material within the casing which surrounds the central part of the conductive member and is spaced therefrom, said corona shield being secured to the casing and dividing said casing into a first space defined by the corona shield and casing and a remaining space, said remaining space containing said insulant, said first pressure applying means comprising insulating fluid under pressure in said first space and said fluid passage means which is permeable to said insulating fluid and impermeable to said solid insulating material connecting said first space and remaining space.
Claim 9
Dependent Claim
28 words
Electrical equipment as claimed in claim 7 wherein said second pressure applying means is in contact with said casing and applies pressure to the particles through said casing.
Claim 10
Dependent Claim
26 words
Electrical equipment as claimed in claim 1 wherein the solid insulating material is selected from the group consisting of quartz, fused silica, mica, glass and porcelain.
Claim 11
Dependent Claim
35 words
Electrical equipment as claimed in claim 1 wherein said fluid, which acts as a discharge suppressant, is selected from the group consisting of low viscosity mineral oil, fluorocarbon oil, silicone oil, nitrogen and sulphur hexafluoride.
Claim 12
Dependent Claim
29 words
Electrical equipment as claimed in claim 1 having at least two conductive members spaced apart from each other, the space between the conductive members being filled by the insulant.
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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) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |