US4039740A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cryogenic power cable
Assignee: Furukawa Electric Co Ltd
•
Filing: 1975-06-18
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Granted: 1977-08-02
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Expires: 1995-06-18
Abstract
Abstract A cryogenic power cable of a cryoresistive type having a conductor which is cooled with a cooling medium to permit large capacity power transmission by reducing thereby the electric resistance and the joule loss of the conductor. The temperature of the cable core is controlled through an ingenious arrangement comprising the conductor which incorporates therein a passage for the cooling medium, an electric insulation layer made of an ordinary electric insulating material and a thermal insulating material layer. The cable not only makes ultra-high voltage transmission of 500 to 1000 KV possible but also is advantageous on account of a simple and economic structure.
Inventors
- 👤 Zensuke Iwata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:24
CPC Classifications
H; H01; H01B; H01B12/00; H01B12/02; Y; Y02; Y02E; Y02E40/00; Y02E40/60; Y10; Y10S; Y10S174/00; Y10S174/13; Y10S174/26; Y10S174/31; Y10S174/32; Y10S505/00; Y10S505/825; Y10S505/884; Y10S505/885; Y10S505/886
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
81 words
A cryogenic power cable comprising 1. an electrical conductor having a cryogenic cooling medium passage therethrough, 2. a layer of thermal insulating material surrounding the conductor, and 3. an electric insulation layer surrounding the layer of thermal insulating material, the electric insulating layer comprising insulating paper or plastic film which has impregnated therein an insulating liquid and the electric insulating layer being cooled with a cryogenic cooling medium to a temperature in the range of from -40° C. to -100° C.
Claim 2
Dependent Claim
81 words
A cryogenic power cable comprising 1. an electrical conductor having a cryogenic cooling medium passage therethrough, 2. a layer of thermal insulating material surrounding the conductor, and 3. an electric insulation layer surrounding the layer of thermal insulating material, the electric insulating layer comprising insulating paper or plastic film which has impregnated therein an insulating liquid and the electric insulating layer being cooled with a cryogenic cooling medium to a temperature in the range of from -40° C. to -100° C.
Claim 3
Dependent Claim
23 words
The cable according to claim 1 wherein said insulating liquid is selected from the group consisting of dodecyl benzene, mineral oil and polybutene.
Claim 4
Dependent Claim
16 words
The cable according to claim 1 wherein the insulating paper is kraft paper or synthetic paper.
Claim 5
Dependent Claim
17 words
The cable according to claim 1 wherein a pressurized gas is applied to the electric insulating layer.
Claim 6
Dependent Claim
13 words
The cable according to claim 1 wherein the thermal insulating layer is semiconductive.
Claim 7
Dependent Claim
28 words
The cable according to claim 1 wherein the electric insulation layer is surrounded by a thermal insulating layer having a thermal conductivity lower than the electric insulating layer.
Claim 8
Dependent Claim
78 words
A cryogenic power cable comprising 1. an electrical cryogenically cooled conductor, 2. a layer of thermal insulating material surrounding the cryogenically cooled conductor, and 3. an electric insulation layer surrounding the layer of thermal insulating material, the electric insulating layer comprising insulating paper or plastic film which has impregnated therein an insulating liquid and the electric insulating layer being cooled with a cryogenic cooling medium to a temperature in the range of from -40° C. to -100° C.
Claim 9
Dependent Claim
78 words
A cryogenic power cable comprising 1. an electrical cryogenically cooled conductor, 2. a layer of thermal insulating material surrounding the cryogenically cooled conductor, and 3. an electric insulation layer surrounding the layer of thermal insulating material, the electric insulating layer comprising insulating paper or plastic film which has impregnated therein an insulating liquid and the electric insulating layer being cooled with a cryogenic cooling medium to a temperature in the range of from -40° C. to -100° C.
Claim 10
Dependent Claim
16 words
The cable according to claim 7 wherein the insulating paper is kraft paper or synthetic paper.
Claim 11
Dependent Claim
17 words
The cable according to claim 7 wherein a pressurized gas is applied to the electric insulating layer.
Claim 12
Dependent Claim
13 words
The cable according to claim 7 wherein the thermal insulating layer is semiconductive.
Claim 13
Dependent Claim
23 words
The cable according to claim 7 wherein the insulating liquid is selected from the group consisting of dodecyl benzene, mineral oil and polybutene.
Claim 14
Dependent Claim
28 words
The cable according to claim 7 wherein the electric insulation layer is surrounded by a thermal insulating layer having a thermal conductivity lower than the electric insulating layer.
Claim 15
Dependent Claim
83 words
A cryogenic power cable comprising 1. an electrical conductor having a cryogenic cooling medium passage surrounding the conductor, 2. a layer of thermal insulating material surrounding the passage, and 3. an electric insulation layer surrounding the layer of thermal insulating material, the electric insulating layer comprising insulating paper or plastic film which has impregnated therein an insulating liquid and the electric insulating layer being cooled with a cryogenic cooling medium to a temperature in the range of from -40° C. to -100° C.
Claim 16
Dependent Claim
83 words
A cryogenic power cable comprising 1. an electrical conductor having a cryogenic cooling medium passage surrounding the conductor, 2. a layer of thermal insulating material surrounding the passage, and 3. an electric insulation layer surrounding the layer of thermal insulating material, the electric insulating layer comprising insulating paper or plastic film which has impregnated therein an insulating liquid and the electric insulating layer being cooled with a cryogenic cooling medium to a temperature in the range of from -40° C. to -100° C.
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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) | 1980-08-01 | 1981-01-31 | 1981-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-01 | 1985-01-31 | 1985-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-01 | 1989-01-31 | 1989-08-02 | $7700.00 | Window Closed / Lapsed |