Electricity: electrical systems and devices – Safety and protection of systems and devices – Superconductor protective circuits
Patent
1984-03-22
1985-10-01
Moose, Jr., Harry E.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Superconductor protective circuits
335216, 361141, H01F 722
Patent
active
045449791
ABSTRACT:
An automatic current lead retraction system for superconducting magnet installations. An automatic current lead retraction system utilizes an operator wherein either hydraulic or pneumatic cylinders bring about electrical contact of the current leads or the separation thereof as well as a safety shorting switch for the system. By using the pneumatic or hydraulic cylinders and all non-magnetic materials, there is no influence upon the magnetic field created by the superconducting magnet. Provision is made to monitor the condition of the magnet to be certain that it is in a persistent mode before the current leads are retracted. Furthermore, safety signals are generated to assure that no current is flowing at the time of retraction, that the resistance across the contacts is sufficiently low when engaged and that all electrical, air/hydraulic fluid systems are functioning properly before operation of the retracting system. Overall control is achieved using a microprocessor. If desired, the entire system can be operated by a program inserted into an appropriate computer.
REFERENCES:
patent: 3839689 (1974-10-01), Biltcliffe et al.
patent: 4369636 (1983-01-01), Purcell et al.
patent: 4453149 (1984-06-01), Rios
Coffey D. Michael
Ennis, Jr. Robert M.
McGhee R. Wayne
Cryomagnetics, Inc.
Moose Jr. Harry E.
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