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http://dx.doi.org/10.5207/JIEIE.2011.25.2.137

Fault Current Limiting and Hysteresys Characteristics of a SFCL using Magnetic Coupling of Two Coils on the Iron Core with an Air-Gap  

Lim, Sung-Hun (숭실대학교 전기공학부)
Kim, Jae-Chul (숭실대학교 전기공학부)
Publication Information
Journal of the Korean Institute of Illuminating and Electrical Installation Engineers / v.25, no.2, 2011 , pp. 137-142 More about this Journal
Abstract
In this paper, the fault current limiting and the hysteresys characteristics of a superconducting fault current limiter (SFCL) using magnetic coupling of two coils on the iron core with an air-gap were analyzed. The introduction of the air-gap in the SFCL with magnetically coupled two coils can suppress the saturation of the iron-core and, on the other hand, make the limiting impedance of the SFCL decreased, which results from the increase of the exciting current. To analyze the effect of the aig-gap on the fault current limiting characteristics of the SFCL, the hysteresys curves of the iron core comprising the SFCL were derived from the short-circuit experiment and the variation in the voltage-current trace of the SFCL during the fault period was analyzed. Through the comparison with the current limiting characteristics of the SFCL without air-gap, the air-gap could be confirmed to contribute to the suppression of the iron core's saturation through the increase of the SFCL's burden from the short-circuit current.
Keywords
Hysteresys Characteristics; Superconducting Fault Current Limiter(SFCL); Air-Gap; Saturation; Current Limiting Characteristics;
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