TY - GEN
T1 - A study on quenching characteristics of YBaCuO bulk superconductor with deposited Ag layer
AU - Fukuda, Katsuya
AU - Fujita, Hiroyuki
AU - Sawa, Koichiro
AU - Tomita, Masaru
AU - Murakami, Masato
AU - Sakai, Naomichi
AU - Hirabayashi, Izumi
PY - 2007/12/1
Y1 - 2007/12/1
N2 - A persistent current switch (PCS) is used for superconducting applications, such as superconducting magnetic energy storage (SMES) system. The authors have proposed a mechanical switch of Y-Ba-Cu-O (YBCO) bulk as a mechanical PCS. In previous reports, in order to investigate the contact characteristics of the switch, 50A current test was performed and the contact resistance between two contacts was measured by four terminal method. As a result, it became clear that polishing and metal depositing on contact surfaces was effective methods to reduce the residual resistance, and the authors achieved to reduce this resistance to 0.64μΩ, which was less than our target value of 1μΩ. This paper focused on the greater current test (above 50A) in order to perform more practical experiment as PCS used for SMES. In this experiment, the authors examined the characteristics to normal conductive state in the YBCO, which was not obtained by former 50A current test. As a result, the transfer current is found to have a relationship with the layer thickness of deposited Ag on contact surfaces. The value of transfer current was rose by increasing the layer thickness of deposited silver, but saturated at around 0.60μm.
AB - A persistent current switch (PCS) is used for superconducting applications, such as superconducting magnetic energy storage (SMES) system. The authors have proposed a mechanical switch of Y-Ba-Cu-O (YBCO) bulk as a mechanical PCS. In previous reports, in order to investigate the contact characteristics of the switch, 50A current test was performed and the contact resistance between two contacts was measured by four terminal method. As a result, it became clear that polishing and metal depositing on contact surfaces was effective methods to reduce the residual resistance, and the authors achieved to reduce this resistance to 0.64μΩ, which was less than our target value of 1μΩ. This paper focused on the greater current test (above 50A) in order to perform more practical experiment as PCS used for SMES. In this experiment, the authors examined the characteristics to normal conductive state in the YBCO, which was not obtained by former 50A current test. As a result, the transfer current is found to have a relationship with the layer thickness of deposited Ag on contact surfaces. The value of transfer current was rose by increasing the layer thickness of deposited silver, but saturated at around 0.60μm.
KW - Contact resistance
KW - Metal deposition
KW - Persistent current switch
KW - Quenching
KW - YBCO
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UR - http://www.scopus.com/inward/citedby.url?scp=38549170366&partnerID=8YFLogxK
U2 - 10.1109/HOLM.2007.4318198
DO - 10.1109/HOLM.2007.4318198
M3 - Conference contribution
AN - SCOPUS:38549170366
SN - 1424408385
SN - 9781424408382
T3 - Electrical Contacts, Proceedings of the Annual Holm Conference on Electrical Contacts
SP - 76
EP - 81
BT - Electrical Contacts 2007
T2 - 53rd IEEE Holm Conference on Electrical Contacts, Holm 2007
Y2 - 16 September 2007 through 19 September 2007
ER -