US3686423A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of cooling long distance low temperature electric conductors
Assignee: Forschungszentrum Jülich
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Filing: 1970-12-15
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Granted: 1972-08-22
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Expires: 1990-12-15
Abstract
Abstract In an electric power line system that includes legs formed of conduit assemblies carrying one or more coolants for maintaining the electric conductors and surrounding radiation shields at very low temperatures, the flow rate of each coolant through any cross section of the conduit assembly differs from the flow rate of the same type of coolant that passes, if at all, through the same cross section in an opposite direction.
Inventors
- 👤 Conrad Doose
- 👤 Wolfgang Sassin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:01
CPC Classifications
H; H02; H02G; H02G15/00; H02G15/34; H01; H01B; H01B7/00; H01B7/17; H01B7/29
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
119 words
A method of cooling a power line system for transmitting electric energy from electric power generating means to consumers over long distances by means of low temperature electric conductors disposed in conduit assemblies that include coolantcarrying conduits and radiatIon shield means surrounding said conduits, said coolants serving for the cooling of said electric conductors and said radiation shield means, comprising the step of advancing said coolants in said system in an open coolant circuit in such a manner that during normal operation the sum of the flow rate of each coolant passing in one and the other direction through any give cross-sectional area of a conduit assembly is other than zero and returning said coolants to their starting point.
Claim 2
Independent Claim
119 words
A method of cooling a power line system for transmitting electric energy from electric power generating means to consumers over long distances by means of low temperature electric conductors disposed in conduit assemblies that include coolantcarrying conduits and radiatIon shield means surrounding said conduits, said coolants serving for the cooling of said electric conductors and said radiation shield means, comprising the step of advancing said coolants in said system in an open coolant circuit in such a manner that during normal operation the sum of the flow rate of each coolant passing in one and the other direction through any give cross-sectional area of a conduit assembly is other than zero and returning said coolants to their starting point.
Claim 3
Dependent Claim
33 words
A method as defined in claim 1, including the step of periodically reversing the coolant flow for causing said coolant to travel alternately in opposite directions in the same conduit for predetermined periods.
Claim 4
Dependent Claim
36 words
A method as defined in claim 1, including the step of advancing a coolant in said conduit assembly in the one direction and returning a coolant in said conduit assembly spaced from said first named coolant.
Claim 5
Dependent Claim
41 words
A method as defined in claim 1, including the step of circulating the coolant for cooling the electric conductors and the coolant for cooling the radiation shield means only in one direction in their respective conduits for at least predetermined periods.
Claim 6
Dependent Claim
36 words
A method as defined in claim 1, including the step of transporting said coolant in mobile containers from the end to the beginning of an open loop conduit system forming part of said power line system.
Claim 7
Dependent Claim
62 words
A method as defined in claim 1, including the steps of periodically reversing the coolant flow in an open loop conduit system and directing at least one portion of the coolant used in one direction of its flow, for the cooling of the electric conductors, into a conduit for cooling said radiation shield means in the other, opposite direction of its flow.
Claim 8
Dependent Claim
34 words
A method as defined in claim 1, including the step of circulating each coolant in its respective conduit continuously and unidirectionally in a closed loop conduit system forming part of said power line system.
References Cited (Backward Citations)
US3343035A
Cited
GB1167054A
Cited
US3529071A
Cited
US3512581A
Cited
FR1541728A
Cited
US3541221A
Cited
US3562401A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-22 | 1976-02-21 | 1976-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-22 | 1980-02-21 | 1980-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-22 | 1984-02-21 | 1984-08-22 | $7700.00 | Window Closed / Lapsed |