Electrical resistors – Resistance value responsive to a condition – Magnetic field or compass
Patent
1983-09-12
1986-04-29
Albritton, Clarence L.
Electrical resistors
Resistance value responsive to a condition
Magnetic field or compass
307245, 307306, 361 19, H01L 4300
Patent
active
045860173
ABSTRACT:
Electrical switches used in conjunction with high energy superconductive windings must be able to quickly absorb large amounts of electrical energy since switching of the superconducting current is accomplished by means of transition to the resistive state in the switch portion of the superconducting current loop. Furthermore, to minimize the heat generated during the transition to the resistive state, the switch itself should exhibit a relatively high resistance while at the same time exhibiting a low external magnetic field. The switch should also exhibit minimal stray magnetic fields, especially in those applications requiring field uniformity. These objectives are achieved in a persistent current switch which includes a length of superconductive material disposed in a compact, thermally insulated volume which also includes a mechanism for heating at least a portion of the superconductive conductor in the switch in order to return it to its resistive state. Furthermore, there is included a mass of thermally conductive material within the volume which is in thermal contact with at least a substantial portion of the superconductive conductor to mitigate the effects of hot spots occuring within the switch.
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Krebs et al., Superconducting Devices for Energy Storage and Switching, Conference 4th Int. Cryogenic Conference Eindhoven, Netherlands May 24-26, 1972 pp. 172-176.
R. Ludemann et al., "Supraleitende Schalter und ihre Anwendung in supraleitenden Magnetsystemen und elektrischen Netzen" 952 Elektrie vol. 34 (1980) No. 2, pp. 89-91.
Jones Donald W.
Laskaris Evangelos T.
Albritton Clarence L.
Cutter Lawrence D.
Davis Jr. James C.
General Electric Company
Lateef M. M.
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