Detection device for detecting transitions to the normal state i

Details Detection device for detecting transitions to the normal state i Detection device for detecting transitions to the normal state i

1988-03-30

1989-08-08

Jennings, Derek S.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Superconductor protective circuits

361 85, 361 91, 505876, H02H 708

Patent

active

048558591

ABSTRACT:
A detection device for detecting transitions to the normal state in a superconducting winding, in particular in an electricity generator, and a protection device for protecting such a winding.
A detection device for detecting transitions in conductors from the superconducting state to the superconducting state in a superconducting winding at industrial frequency, in particular for the stator of an electricity generator (1). The device comprises an auxiliary generator (4) for generating a low current at a frequency which is considerably higher than industrial frequency, said current being single-phase or multi-phase depending on whether the main current through the winding is single-phase or multi-phase, said auxiliary generator being connected in parallel with the superconductor winding, the device further including means (5, 6) for detecting the change in phase difference between the auxiliary current and the auxiliary voltage which occurs when the conductors of said winding switch to the normal state.

REFERENCES:
patent: 4021703 (1977-05-01), Gary et al.
patent: 4271443 (1981-06-01), Nother
patent: 4375659 (1983-03-01), Cunningham et al.
patent: 4393429 (1983-07-01), Maki et al.
patent: 4451823 (1984-05-01), Penn et al.
patent: 4703387 (1987-10-01), Miller
patent: 4777437 (1988-10-01), Tasliro et al.
Patent Abstracts of Japan, vol. 9, No. 288 (E-358) [2011], Nov. 15, 1985, of Japanese Patent Application No. 60-130 107; "Superconductive Protecting Circuit", Toshiba K.K., Masami Urata.

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