US3869562A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual underground cable system for transmitting electrical power
Assignee: BBC Brown Boveri AG Switzerland
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Filing: 1974-02-05
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Granted: 1975-03-04
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Expires: 1994-02-05
Abstract
Abstract A dual system for electric power transmission laid underground comprises two three-phase compressed gas insulated transmission lines operating electrically in parallel each which is designed in the form of three symmetrically spaced phase conductors enclosed within a pressurized gas-filled metallic tube which serves to dissipate the heat losses into the surrounding earth. The metallic tubes of the two three-phase transmission lines are interconnected by heat-conductive metallic plates distributed along the length of the conductor installation whereby in the event of failure of one of the transmission line, the load carried by the other system can be increased substantially during the period of failure through utilization of the metallic tube of the failed lines for dissipation of a portion of the heat losses of the other lines remaining in operation.
Inventors
- 👤 Adolf Eidinger
- 👤 Carl-Dieter Floessel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:29
CPC Classifications
H; H01; H01B; H01B7/00; H01B7/17; H01B7/29
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
143 words
A dual system for transmission of electrical power underground and which provides for dissipation of heat from each such system into the surrounding earth comprising two three-phase compressed-gas-insulated transmission lines extending in parallel spaced relation in the earth and which operate electrically in parallel, each said transmission line comprising three conductors encapsulated within at least one metallic tube filled with a compressed insulating gas and from which heat is dissipated into the earth, and metallic heat conductive members interconnecting said parallel sPaced conductor encapsulating tubes and which extend longitudinally in a substantially continuous manner throughout the entire length of said dual power transmission lines whereby in case of a failure of one of said transmission lines the normal load carried by the other can be substantially increased due to the additional heat dissipating capacity provided by the encapsulating tube of the failed line.
Claim 2
Dependent Claim
143 words
A dual system for transmission of electrical power underground and which provides for dissipation of heat from each such system into the surrounding earth comprising two three-phase compressed-gas-insulated transmission lines extending in parallel spaced relation in the earth and which operate electrically in parallel, each said transmission line comprising three conductors encapsulated within at least one metallic tube filled with a compressed insulating gas and from which heat is dissipated into the earth, and metallic heat conductive members interconnecting said parallel sPaced conductor encapsulating tubes and which extend longitudinally in a substantially continuous manner throughout the entire length of said dual power transmission lines whereby in case of a failure of one of said transmission lines the normal load carried by the other can be substantially increased due to the additional heat dissipating capacity provided by the encapsulating tube of the failed line.
Claim 3
Dependent Claim
51 words
A dual underground electrical power transmission system as defined in claim 1 wherein said heat conductive members which interconnect said parallel spaced conductor encapsulating tubes are constituted by longitudinally extending metallic plates located between said encapsulating tubes and which are welded thereto at their points of minimum distance from each other.
Claim 4
Dependent Claim
51 words
A dual underground electrical power transmission system as defined in claim 1 wherein said heat conductive members which interconnect said parallel spaced conductor encapsulating tubes are constituted by longitudinally extending metallic plates located between said encapsulating tubes and which are welded tangentially thereto at the tops and bottoms of the tubes.
Claim 5
Dependent Claim
28 words
A dual underground electrical power transmission system as defined in claim 1, wherein the individual phase conductors of each transmission line are encapsulated in a common metallic tube.
Claim 6
Dependent Claim
49 words
A dual underground electrical power transmission system as defined in claim 1, wherein the individual phase conductors of each transmission line are encapsulated in separate metallic tubes, and said interconnecting metallic heat conductive members extend respectively between the encapsulating tubes of corresponding phase conductors of the two transmission lines.
References Cited (Backward Citations)
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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) | 1978-03-03 | 1978-09-02 | 1979-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-03 | 1982-09-02 | 1983-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-03 | 1986-09-02 | 1987-03-04 | $7700.00 | Window Closed / Lapsed |