Electricity: electrical systems and devices – Safety and protection of systems and devices – Superconductor protective circuits
Patent
1979-09-07
1981-06-02
Salce, Patrick R.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Superconductor protective circuits
307306, H02H 328
Patent
active
042714435
ABSTRACT:
A quench detector for monitoring a tapped superconducting coil for changes in its conductivity and also for monitoring the integrity of the measuring leads connected to the coil. The quench detector comprises a bridge circuit including first and second resistance means having a junction therebetween connected to a first measuring point, the other ends of the first and second resistance means being connected to corresponding opposite ends of the superconducting coil. The first and second coil elements on either side of the tap of the superconducting coil and the first and second resistance means form the first branch of the bridge circuit.
The second branch of the bridge circuit consists of third and fourth resistance means, each having one end connected to a second measuring point and its other end connected to the tap on the superconducting coil. The resistance of the second branch corresponds to the real or resistive, component of the impedance of the firsh branch of the bridge circuit.
An operational amplifier is provided which has its first and second inputs coupled to the first and second measuring points respectively and its output coupled to the first measuring point through a fifth resistance means constituting the third branch of the bridge circuit. A sixth resistance means constituting the fourth branch of the bridge circuit is coupled between a source of test voltage and the second measuring point.
REFERENCES:
patent: 3304466 (1967-02-01), Minnich et al.
patent: 3579035 (1971-05-01), Burnier et al.
Journal of Applied Physics-vol. 42, No. 1; Jan.-1971; by D. H. Lester, "Constant Voltage Controller and Transition Monitor for Superconducting Magnets."
"Loss Measurements in Superconducting Magnetic Energy Storage Coils", Lindsay et al., Los Alamos Scientific Laboratory, LA-6790-MS; May 1977.
Kernforschungszentrum Karlsruhe
Salce Patrick R.
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