NDLI: Test results of a 1.5 kA HTS current lead for /spl mu/SMES

Content Provider	IEEE Xplore Digital Library
Author	Pfotenhauer, J.M. Lokken, O.D.
Copyright Year	2002
Abstract	A pair of 1.5 kA current leads incorporating a conventional (copper) upper stage, a lower BSCCO stage, and intermediate cooling from a twin-cold-finger GM cryocooler have been designed, fabricated and tested. A lower stage has been fabricated and tested using a stacked-tape sample of BSCCO-2223 material donated by American Superconductor Corporation. Test results characterize the helium boil-off rate, cryocooler power consumed, and joint resistances measured during the base line operation of the current leads at various currents. Additionally, the transient performance of the leads in response to a loss of cooling is reported. Here the temperatures and voltage drops at significant locations on the leads are reported as a function of time for the various operation conditions. Test results show that the most significant factor in determining the allowable operation time subsequent to a loss of cooling is the thermal inertia of the cold bus connecting the current leads to the cryocooler. The current leads are designed for use in a /spl mu/SMES system and incorporate the necessary lead-to-lead voltage isolation within the body of the cryocooler.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	363
Ending Page	366
Page Count	4
File Size	450200
File Format	PDF
ISSN	10518223
Volume Number	7
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1997-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	High temperature superconductors Cooling Superconducting materials Voltage Copper Bismuth compounds Materials testing Current measurement Electrical resistance measurement
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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