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Superconducting Fault Current Limiters (SFCL) use the natural ability of rapid shifting from the normal to the resistive state of superconductor due to their critical current value exciding. The voltage dependence on the structure of superconducting inductive fault current limiter in a superconducting stable is described.

The results of experimental and computational investigations of the properties of inductive superconducting fault current limiters (SFCL) with closed and open cores are presented and discussed.

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Currently produced and available HTS tapes with increased resistivity, like 2nd generation YBCO 344S tape made by American Superconductors, have enough parameters, e.g., resistivity, critical current density, to build inductive type current limiters to limit faults in medium-voltage power grid. The paper describes the assumption for 6,9 kV/1.15 kA superconducting fault current limiter with superconducting secondary winding made of high resistivity HTS tape as well as the results of numerical analysis. [ABSTRACT FROM AUTHOR]

The resistive SFCL (superconducting fault current limiter) is a superconducting device which may operate both in superconducting state and in normal conducting (resistive) state. The paper presents FEM numerical model (in FLUX2D) of resistive SFCL made using Bi-2212 bifilar coil (NEXANS) cooled by pool boiling cooling technique (liquid nitrogen, 77 K). Real geometry of resistive SFCL is replaced by equivalent, due to energy and current density, geometry of numerical model. The electro-thermal numerical model of resistive SFCL can be used to estimate the energy and maximum temperature in limiter and the time to switch off the current, to protect against damage. [ABSTRACT FROM AUTHOR]

A single-phase, 230 V Superconducting Fault Current Limiter using two Bi2223 HTS tubes with the total critical current 2.5 kA situated in vacuum insulated cryostat has been described in this paper. We designed and manufactured the inductive SFCL with an open core as core shielded type acquired the optimal design parameters by using Finite Element Method. We tested the limiter performances at liquid nitrogen temperature 77 K. We proved that the performances of properly designed limiter with open core could be comparable to the limiter with closed core. [ABSTRACT FROM AUTHOR]

Copyright of Prace Instytutu Elektrotechniki is the property of Electrotechnical Institute and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)