DocumentCode :
1398326
Title :
Transition Criteria for Critical Current Measurement of High Temperature Superconductor in AC Circumstance
Author :
Jiho Lee ; Sukjin Choi ; Young Jin Hwang ; Woo Seung Lee ; Yeong-Chun Kim ; Tae Kuk Ko
Author_Institution :
Sch. of Electr. & Electron. Eng., Yonsei Univ., Seoul, South Korea
Volume :
22
Issue :
3
fYear :
2012
fDate :
6/1/2012 12:00:00 AM
Firstpage :
6400204
Lastpage :
6400204
Abstract :
There are a number of AC power devices using high temperature superconductor (HTS) such as Superconducting Fault Current Limiter (SFCL), Superconducting Transformer, AC Superconducting cable and so on. However, the operating current of HTS power devices at alternating current (AC) circumstances is almost decided by critical current which is measured in direct current (DC) circumstances. Applying DC critical current criterion to AC power devices cannot be ideal. So, for AC power devices, a new AC critical current criterion must be needed. Commercial AC frequencies of current grid are 50 and 60 Hz. Therefore, in AC circumstance, the voltage induced by inductance is not negligible. For this paper, AC conducting experiments on variable super conducting tape samples were executed. The voltage induced by inductance is removed by filtering process and the voltage produced by resistance remains and is considered as a parameter (or guide line) of quench. With filtering process, amplitude of voltage generated by resistance can be calculated. As a result of those experiments, the `Amplitude of input current´-`amplitude of voltage induced by resistance´ curve was acquired and alternating critical current criteria were inferred.
Keywords :
conducting materials; critical currents; electric current measurement; filtering theory; high-temperature superconductors; superconducting tapes; AC circumstance; AC conducting experiment; AC critical current criterion; AC frequency; AC power device; AC superconducting cable; DC circumstance; DC critical current criterion; HTS power device; SFCL; alternating critical current criteria; alternating current circum- stances; critical current measurement; current grid; direct current circumstance; filtering process; frequency 50 Hz; frequency 60 Hz; high temperature superconductor power device; input current amplitude; resistance curve acquisition; superconducting fault current limiter; superconducting transformer; variable superconducting tape sample; voltage induced amplitude; Bismuth compounds; Conductors; Critical current; Current measurement; High temperature superconductors; Superconducting films; Superconducting filters; AC; critical current; high temperature superconductors; n value; power devices; quench criterion; superconducting device;
fLanguage :
English
Journal_Title :
Applied Superconductivity, IEEE Transactions on
Publisher :
ieee
ISSN :
1051-8223
Type :
jour
DOI :
10.1109/TASC.2011.2178375
Filename :
6104113
Link To Document :
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