Abstract
Superconducting fault current limiters (SCFCLs) are expected to improve not only reliability but also stability of power systems. To introduce an SCFCL in a power system, various specifications such as trigger current level, impedance in current limiting operation, recovery time and so on are necessary. Especially, fault analyses point out that accuracy of the trigger current level is necessary. Therefore, an SCFCL of a transformer type with adjustable trigger current level was proposed and made. By use of the trial SCFCL adjustability of the trigger current level was confirmed experimentally. In addition, good limiting and recovery characteristics were confirmed, too. In this paper, characteristics of the SCFCL are considered from the viewpoint of specifications. Most of the specifications depend on the characteristics in current limiting operation. Therefore, the characteristics of the SCFCL in current limiting operation are considered. It is shown that these characteristics are useful for designing, and design criteria of the SCFCL are summarised.
