Patent US4474291A successfully refreshed from Google Patents.
US3643003A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transformer termination for metal-enclosed, compressed-gas-insulated electrical conductors
Assignee: ABB Inc USA
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Filing: 1970-04-24
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Granted: 1972-02-15
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Expires: 1990-04-24
Abstract
Abstract The grounded enclosure tube of the compressed-gas-insulated electrical conductor is attached to the metal wall of a power transformer tank and the energized conductor tube extends into the interior of the transformer tank wherein it is supported and insulated from the tank wall to provide a simple and inexpensive connection between metal enclosed switchgear, for example, and power transformers in a high-voltage electrical substation.
Inventors
- 👤 Howard W Graybill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:46
CPC Classifications
H; H01; H01B; H01B17/00; H01B17/36; H01F; H01F27/00; H01F27/02; H01F27/04; Y; Y10; Y10S; Y10S174/00; Y10S174/10
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
179 words
In combination, a high-voltage oil-filled transformer tank having an opening in one wall of the tank; a gas filled insulated bus comprising a tubular inner conductor surrounded by a concentric conductive tubular housing; one end of said inner conductor extending into said tank; one end of said tubular housing terminating in the region adjacent said opening; first means securing said tubular housing to said tank wall including a conical shaped power transformer insulator bushing surrounding said tubular conductor, the large diameTer end of said bushing being secured to the tank adjacent said opening; second means securing the small diameter end of said bushing to said one end of said tubular conductor; a cylindrical shell extending outwardly from said tank wall opening and surrounding a portion of said tubular housing; third and fourth means respectively sealing the junctures between said bushing and said tank and between said bushing and said tubular conductor to prevent gas from said bus entering into the interior of said bushing from leaking into said tank, means mechanically securing said tubular housing to said cylindrical shell.
Claim 2
Dependent Claim
179 words
In combination, a high-voltage oil-filled transformer tank having an opening in one wall of the tank; a gas filled insulated bus comprising a tubular inner conductor surrounded by a concentric conductive tubular housing; one end of said inner conductor extending into said tank; one end of said tubular housing terminating in the region adjacent said opening; first means securing said tubular housing to said tank wall including a conical shaped power transformer insulator bushing surrounding said tubular conductor, the large diameTer end of said bushing being secured to the tank adjacent said opening; second means securing the small diameter end of said bushing to said one end of said tubular conductor; a cylindrical shell extending outwardly from said tank wall opening and surrounding a portion of said tubular housing; third and fourth means respectively sealing the junctures between said bushing and said tank and between said bushing and said tubular conductor to prevent gas from said bus entering into the interior of said bushing from leaking into said tank, means mechanically securing said tubular housing to said cylindrical shell.
Claim 3
Dependent Claim
21 words
The combination of claim 1 further comprising toroidal shaped transformer means positioned within said cylindrical shell and surrounding said tubular housing.
Claim 4
Dependent Claim
24 words
The combination of claim 2 wherein said first means further includes means insulating said one end of said tubular housing from said cylindrical shell.
Claim 5
Dependent Claim
31 words
The combination of claim 1 wherein said one end of said tubular housing is provided with a corona ring to eliminate high voltage gradients at the adjacent end of said bushing.
Claim 6
Dependent Claim
27 words
The combination of claim 1 wherein said third and fourth means each comprise weldments respectively joining the bushing ends to said tubular conductor and said tubular housing.
Claim 7
Dependent Claim
58 words
The combination of claim 1 wherein said bushing is provided with metallic surfaces at each end thereof; said first means being comprised of a metallic ring respectively welded to said tubular housing and one of said metallic surfaces; said second means being comprised of a metallic ring respectively welded to said conductor and one of said metallic surfaces.
Claim 8
Dependent Claim
63 words
The combination of claim 6 wherein said metallic rings are each comprised of explosion bonded bimetallic aluminum copper rings; said mechanical securing means comprising a clamping assembly securing said tubular housing to the interior of said cylindrical shell; fifth means sealing the free end of said cylindrical shell to said tubular housing a spaced distance from said one end of said tubular housing.
References Cited (Backward Citations)
US3239599A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-14 | 1975-08-16 | 1976-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-14 | 1979-08-16 | 1980-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-14 | 1983-08-16 | 1984-02-15 | $7700.00 | Window Closed / Lapsed |