Electricity: electrical systems and devices – Safety and protection of systems and devices – Superconductor protective circuits
Patent
1984-01-27
1985-12-17
Salce, Patrick R.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Superconductor protective circuits
361141, 335216, H02H 900
Patent
active
045595763
ABSTRACT:
The device is for a superconducting magnetic coil assembly that is to be cryogenically cooled by a liquid coolant, and is subdivided into several partial winding sections that are connected one after the other to protect the assembly in the event of an unintended transition from the superconducting state to the normal conducting state. A protective resistor is connected in parallel with each partial winding section and the ends of adjacent partial winding sections that face one another are connected to the corresponding ends of their respective protective resistors by a common section of an electrical conductor. With a passive protection device of this kind, it should be possible to use protective resistors with a relatively small mass. According to the invention, the protective resistors are located in the exhaust gas stream of the coolant, and in each of the sections of the conductor that are common to adjacent partial winding sections there is located a small auxiliary resistor. Two electrical heating elements are connected in parallel to each auxiliary resistance. The heating elements are in thermal contact with the two adjacent partial winding sections, which are connected with the respective auxiliary resistors. In addition, it is advantageous to provide a superconducting persistent-current switch with which the partial winding sections that are connected one after the other can be short-circuited.
REFERENCES:
patent: 3419794 (1968-12-01), Weaver, Jr. et al.
patent: 3450952 (1969-06-01), Nelson
patent: 3474295 (1969-10-01), Marshall
IEEE Transactions on Magnetics, vol. MAG-15, No. 1, Jan. 1979, pp. 855 to 850, "Quench Protection for a 2-MJ Magnet", by Taylor et al.
IEEE Transactions on Magnetics, vol. MAG-17, No. 5, Sep. 1981, pp. 1815 to 1822, "Some Basic Problems in Superconducting Magnet Design", M. Wilson.
The Review of Scientific Instruments, vol. 34, No. 4, Apr. 1963, pp. 368 to 373, "Protection of Superconducting Coils", P. F. Smith.
IEEE Transactions on Nuclear Science, vol. NS-24, No. 3, Jun. 1977, pp. 1318 to 1319, "Superconducting Magnet Quench Protection for Isabelle", Robins et al.
Moran John Francis
Salce Patrick R.
Siemens Aktiengesellschaft
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