Anisotropic high temperature superconductors as variable resistors and switches

Several anisotropic high temperature superconductors show critical current densities which are strongly dependent on the direction of an applied external magnetic field. The resistance of a sample can change by several orders of magnitude by applying a magnetic field. The potential for using the fie...

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Bibliographic Details
Published inIEEE transactions on applied superconductivity Vol. 5; no. 2; pp. 1040 - 1043
Main Authors Boenig, H.J., Daugherty, M.A., Fleshler, S., Maley, M.P., Mueller, F.M., Prenger, F.C., Coulter, J.Y.
Format Journal Article
LanguageEnglish
Published IEEE 01.06.1995
Subjects
Anisotropic magnetoresistance
Circuit testing
Critical current density
High temperature superconductors
Large-scale systems
Magnetic circuits
Magnetic fields
Power systems
Resistors
Switches
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Summary:Several anisotropic high temperature superconductors show critical current densities which are strongly dependent on the direction of an applied external magnetic field. The resistance of a sample can change by several orders of magnitude by applying a magnetic field. The potential for using the field dependent variable resistor or switch for applications in power systems is evaluated. Test results with small samples are presented, The requirements for large scale applications are outlined. The magnetic field triggering requirement, the frequency response of the device, use in 60 Hz AC circuits and heat transfer considerations are investigated. Several application examples are discussed. Use of the variable resistor as a fault current limiter, as a switching element in rectifier circuitry and as an improved dump resistor for a superconducting magnet is presented.< >
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ISSN:1051-8223
1558-2515
DOI:10.1109/77.402729