Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – Superconductive type
Patent
1985-01-25
1987-01-06
Harris, George
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
Superconductive type
174126S, 336DIG1, H01F 722
Patent
active
046350152
ABSTRACT:
A switching device for shorting at least one superconducting magnet winding contains at least two contacts which can be cooled by a cryogenic medium and joined together by means of an actuator in such a manner that a superconducting current path and a normally conducting current path which completely stabilizes the superconducting current path are developed. The switching device exhibits a relatively large ohmic resistance in its open switch state. To this end, a current path with at least one partially stabilized superconductor with a resistance of at least 200 ohms in the normally conducting state of the superconductor and which is always closed is provided. A predetermined number of turns of the partially stabilized superconductor is connected to a switchable heating device in thermal contact therewith and electrically insulated therefrom. In addition, at least two contacts of normally conducting material are provided, each of which can be connected to the magnet winding via an electric conductor. The normally conducting contacts are joined to the partially stabilized superconductor in such a manner that the sections of the superconductor extending between these contacts are connected in parallel, at least partially, by the contacts when the switch is closed.
REFERENCES:
patent: 3559128 (1971-01-01), Kingston et al.
patent: 4016526 (1977-04-01), Gamet et al.
Computertomographic 1 (1981) 2-10, Georg Thieme Verlag Stuttgart--New York.
Harris George
Siemens Aktiengesellschaft
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