Patent US3814832A successfully refreshed from Google Patents.
US3814832A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cable drawn through polymer tube within polymer housing for electrical transmission
Assignee: ABB Inc USA
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Filing: 1973-05-21
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Granted: 1974-06-04
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Expires: 1993-05-21
Abstract
Abstract A gas insulated power transmission system having a stranded cable conductor that extends coaxially inside a cylindrical enclosure and through a reinforced plastic tube arranged centrally within the enclosure. The cable is allowed to expand radially so that axial expansion is not needed. Expansion joints may be required for the tube. To provide the optimum dielectric shielding, the tube has a high dielectric constant. The space between the cable and the tube and the space between the tube and the enclosure are filled with an insulating gas, such as SF6.
Inventors
- 👤 J Cronin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:38
CPC Classifications
H; H01; H01B; H01B7/00; H01B7/02; H01B7/0233
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
93 words
An isolated phase bus conductor structure having: a metal tubular longitudinal substantially continuous housing; a central tube of material having low electrical conductivity; means in said housing supporting said central tube along the axis of said housing; and a stranded cable of high electrical conductivity carried within said tube; said tube having an opening therethrough of a first cross section and said cable having a cross sectional width less than said first cross section; said cable having the characteristic of expanding radially and deflecting within said tube in response to increased thermal conditions.
Claim 2
Dependent Claim
93 words
An isolated phase bus conductor structure having: a metal tubular longitudinal substantially continuous housing; a central tube of material having low electrical conductivity; means in said housing supporting said central tube along the axis of said housing; and a stranded cable of high electrical conductivity carried within said tube; said tube having an opening therethrough of a first cross section and said cable having a cross sectional width less than said first cross section; said cable having the characteristic of expanding radially and deflecting within said tube in response to increased thermal conditions.
Claim 3
Dependent Claim
22 words
The isolated phase bus conductor structure of claim 1 in which said tube and said housing are filled with a dielectric gas.
Claim 4
Dependent Claim
17 words
The isolated phase bus conductor structure of claim 2 in which said dielectric gas is sulfur hexafluoride.
Claim 5
Dependent Claim
20 words
The isolated phase bus conductor structure of claim 3 in which said central tube is made of electrically nonconductive material.
Claim 6
Dependent Claim
19 words
The isolated phase bus conductor structure of claim 4 in which said central tube has conducting material dispersed therein.
Claim 7
Dependent Claim
16 words
The isolated phase bus conductor structure of claim 5 in which said conducting material is graphite.
Claim 8
Dependent Claim
20 words
The isolated phase bus conductor structure of claim 4 in which said central tube has a conductive layer embedded therein.
Claim 9
Dependent Claim
32 words
The isolated phase bus conductor structure of claim 7 in which contacts are provided connected to said conductive layer and extending into the interior of said central tube and engaging said cable.
Claim 10
Dependent Claim
22 words
The isolated phase bus conductor structure of claim 4 in which said central tube has a conductive layer on its inner surface.
Claim 11
Dependent Claim
44 words
The isolated phase bus conductor structure of claim 4 in which said central tube comprises a plurality of tube lengths, an end of each central tube being received in the adjacent end of the next adjacent central tube and having a sliding fit therein.
Claim 12
Dependent Claim
24 words
The isolated phase bus conductor structure of claim 10 in which an insulating sleeve is mounted between said sliding ends of adjacent central tubes.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-03 | 1977-12-03 | 1978-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-03 | 1981-12-03 | 1982-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-03 | 1985-12-03 | 1986-06-04 | $7700.00 | Window Closed / Lapsed |