NDLI: Analysis of joint-resistance-induced, non-uniform current distribution

Content Provider	IEEE Xplore Digital Library
Author	Seo, K. Mito, T. Miller, J.R. Kawabata, S. Ichihara, T. Hasegawa, M.
Copyright Year	2002
Description	The observation of nonuniform current distribution (NUCD) in multi-strand cables, in particular cable-in-conduit conductors (CICC's), has been reported often. NUCD may have important effects on AC loss and stability margin in such conductors; therefore, this phenomenon must be better understood. In this study, we have used numerical simulations to study the magnetic flux changes caused by NUCD's that themselves derive from details of lap-joint construction between cables composed of hundreds of strands and twisted in specific patterns. In the steady state, a NUCD is governed by the distribution and quantitation of contact resistances between individual strands in one cable to individual strands in the other. In an otherwise well-made joint, contact resistances will be lowest between strands that approach each other across the lap-joint-interface, and a strand that has many close encounters with the interface can be expected to carry larger current in the steady-state condition than a strand that has fewer or none. The length of the joint and the cable pattern determine the number of close encounters to the lap-joint-interface by individual strands. We present the results of our simulations using different joint length, we suggest experiments to observe these effects, and we discuss their significance with regard to conductor and magnet performance.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	1595
Ending Page	1598
Page Count	4
File Size	970447
File Format	PDF
ISSN	10518223
Volume Number	15
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Current distribution Cables Numerical models Conductors Steady-state Surface resistance Contact resistance Frequency Magnetic field measurement Stability nonuniform current distribution AC loss cable in conduit conductor lap-joint
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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