Patent US3764726A successfully refreshed from Google Patents.
US3764726A
Expired / Lapsed
US
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Terminal for electrical apparatus with conductors cooled down to a low temperature
Assignee: Siemens AG
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Filing: 1972-11-02
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Granted: 1973-10-09
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Expires: 1992-11-02
Abstract
Abstract A high voltage-resistant, current feed terminal to a superconductor cooled down to a low temperature, with its connected normal conductor being provided with a heat exchanger. Coolant input lines and coolant output lines each form spirals having turns which surround the normal conductor and which are designed as voltage dividers. The spiral-shaped design has the advantage that the coolant line can take up a high potential gradient. The voltage divider causes a uniform division of the voltage in such a manner that the breakdown voltage of the coolant is not reached.
Inventors
- 👤 H Kohler
- 👤 F Schmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:18
CPC Classifications
H; H02; H02G; H02G15/00; H02G15/34; H01; H01B; H01B12/00; H01F; H01F6/00; H01F6/06; H01F6/065; Y; Y02; Y02E; Y02E40/00; Y02E40/60; Y10; Y10S; Y10S505/00; Y10S505/825; Y10S505/884; Y10S505/885
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
120 words
A current feed terminal for electrical apparatus having conductors cooled down to a low temperature, comprising: a normal conductor connected to the end of said terminal; heat exchanger means connected to said normal conductor; and input and output lines for the coolant to said exchanger, said input and output lines consisting of electrically insulating material with each of said lines designed as a spiral, the turns of which surround said normal conductor, and each of said input and output lines having associated therewith an electric resistance arrangement which constitutes a voltage divider producing a voltage gradient in the cooling liquid which is smaller than the breakdown voltage of the coolant for corresponding length units of said input and output lines.
Claim 2
Dependent Claim
120 words
A current feed terminal for electrical apparatus having conductors cooled down to a low temperature, comprising: a normal conductor connected to the end of said terminal; heat exchanger means connected to said normal conductor; and input and output lines for the coolant to said exchanger, said input and output lines consisting of electrically insulating material with each of said lines designed as a spiral, the turns of which surround said normal conductor, and each of said input and output lines having associated therewith an electric resistance arrangement which constitutes a voltage divider producing a voltage gradient in the cooling liquid which is smaller than the breakdown voltage of the coolant for corresponding length units of said input and output lines.
Claim 3
Dependent Claim
25 words
Terminal according to claim 1, wherein said resistance arrangement consists of a semiconductor layer on the inside surface of said input or output line, respectively.
Claim 4
Dependent Claim
12 words
Terminal according to claim 1, wherein said coolant is a one-phase coolant.
Claim 5
Dependent Claim
23 words
Terminal according to claim 1, wherein at least the spiral of said input or output lines forms the surface of a truncated cone.
Claim 6
Dependent Claim
31 words
Terminal according to claim 4, wherein the inside diameter of each of the turns of said spiral is equal to or smaller than the outside diameter of the adjacent, smaller turn.
Claim 7
Dependent Claim
14 words
Terminal according to claim 1, wherein said voltage divider comprises a capacitive voltage divider.
Claim 8
Dependent Claim
78 words
Terminal according to claim 6, wherein at least one of said coolant input lines comprises individual sections which are connected with each other via annular intermediate pieces of electrically conducting material, and each of said intermediate pieces is connected with a sleeve of electrically conducting material which surrounds said coolant line, the ends of said sleeve being folded over to form a hollow ring which has a predetermined distance from the similarly formed end of the adjacent sleeve.
Claim 9
Dependent Claim
16 words
Terminal according to claim 1, wherein said heat exchanger means is arranged in a high-vacuum vessel.
Claim 10
Dependent Claim
22 words
Terminal according to claim 8, further comprising a radiation shield between said heat exchanger means and the wall of the high-vacuum vessel.
Claim 11
Dependent Claim
16 words
Terminal according to claim 9, wherein a separate cooling arrangement is provided for said radiation shield.
Claim 12
Dependent Claim
19 words
Terminal according to claim 1, wherein liquid helium is provided as the cooling medium for said heat exchanger means.
Claim 13
Dependent Claim
21 words
Terminal according to claim 1, wherein gaseous helium under overpressure is provided as the cooling medium for said heat exchanger means.
Claim 14
Dependent Claim
18 words
Terminal according to claim 1, wherein a second heat exchanger means is further provided for said normal conductor.
Claim 15
Dependent Claim
19 words
Terminal according to claim 13, wherein hydrogen is provided as the cooling medium for said second heat exchanger means.
Claim 16
Dependent Claim
18 words
Terminal according to claim 14, wherein a third heat exchanger means is further provided for said normal conductor.
Claim 17
Dependent Claim
22 words
Terminal according to claim 15, wherein liquid nitrogen under oveRpressure is provided as the cooling medium for said third heat exchanger means.
Claim 18
Dependent Claim
46 words
Terminal according to claim 1, wherein at least one of said input and output lines comprises a tubular line which is coated on the inside or outside with a semiconductor, the electric conductivity of which changes over the length of the tube in steps, or gradually.
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) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |