Electrical behavior of Bi-2223/Ag tapes under applied alternating over-currents

As a study for the protection of HTS power machines operated under AC conditions, the electrical behavior of Bi-2223/Ag tapes with applied alternating over-currents was investigated. Using the HTS tape of 57 A I/sub c/ and 106 K T/sub c/, we measured the V-I curves for the over-critical current regi...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2005-06, Vol.15 (2), p.2482-2487
Main Authors: Seong-Woo Yim, Sung-Hun Lim, Hye-Rim Kim, Si-Dole Hwang, Kishio, K.
Format: Article
Language:English
Subjects:
Alternating over-current
Applied sciences
Bi-2223/Ag tapes
Conducting materials
Critical current
Current distribution
Current measurement
Electric power generation
Electrical engineering. Electrical power engineering
Electrical resistance measurement
ELECTRICITY
Electronics
Equivalence
Exact sciences and technology
High temperature superconductors
Materials
MATHEMATICAL ANALYSIS
Optimization
Protection
protection of HTS machine
quench development
QUENCHING MECHANISMS
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Silver
Superconducting cables
Superconducting devices
Superconducting films
Superconducting materials
Superconducting tapes
SUPERCONDUCTIVITY
SUPERCONDUCTORS
TAPE
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Summary:As a study for the protection of HTS power machines operated under AC conditions, the electrical behavior of Bi-2223/Ag tapes with applied alternating over-currents was investigated. Using the HTS tape of 57 A I/sub c/ and 106 K T/sub c/, we measured the V-I curves for the over-critical current region from 150 A/sub p/ to 507 A/sub p/. From the experimental results, 3 matters were investigated. Firstly, using the resistance increase data obtained from the curves, quench development was analyzed as a function of the amplitude and duration of the applied currents. Secondly, to understand these phenomena in detail, we investigated the current distribution between the superconductor and the metal sheath in Bi-2223/Ag tape, applying the equivalent equations and data of V-I curves. Finally, we confirmed the relationship between the resistance and temperature generated by the over-critical current experimentally. As a result, we could find the optimal operating condition considering the protection of the HTS tape against the alternating over-current.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2005.847493