Superconducting coil protective system

Details Superconducting coil protective system Superconducting coil protective system

1991-05-29

1993-05-11

DeBoer, Todd E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Superconductor protective circuits

361 4, 361 58, 361 11, 361141, 505850, H02H 700

Patent

active

052106748

ABSTRACT:
A superconducting coil protective system comprises a quenching detector (QD) for detecting occurrence of a quenching in a superconducting coil (L) and generating a quenching signal indicative of the occurrence of the quenching. In response to the quenching signal, a voltage controller (VC) reduces an output voltage from a power source (PS) to zero or to a negative polarity. A current interrupter (CI) including a circuit breaker (CB) or a fuse (F) is connected in parallel to the superconducting coil (L) for allowing a first commutation of a current from the superconducting coil (L) to the current interrupter (CI) upon the reduction of the output voltage from the power source (PS). The system also comprises a protective resistor (RD) connected in parallel to the current interrupter (CI) for allowing a second commutation of the first-commutated current thereto upon the opening of the current interrupter (CI), whereby energy of the second-commutated current is dissipated in the protective resistor. A protective method for the superconducting coil utilizing the above system is also disclosed.

REFERENCES:
patent: 4740858 (1988-04-01), Yamaguchi et al.
patent: 4855859 (1989-08-01), Tixador et al.
"Improvements in the Parallel Resistor Circuit for the Quench Protection of a Superconducing Magnet" by T. Nakano et al. B-102 No. 12 pp. 73-79, from Japanese Institute of Electrical Engineering, Dec. 1982.

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