NDLI: Measurements of AC Losses and Current Distribution in Superconducting Cables

Content Provider	IEEE Xplore Digital Library
Author	Nguyen, D.A. Ashworth, S.P. Duckworth, R. Carter, W. Fleshler, S.
Copyright Year	2002
Abstract	This paper presents our new experimental facility and techniques to measure ac loss and current distribution between the layers for High Temperature Superconducting (HTS) cables. The facility is powered with a 45 kVA three-phase power supply which can provide three-phase currents up to 5 kA per phase via high current transformers. The system is suitable for measurements at any frequency between 20 and 500 Hz to better understand the ac loss mechanisms in HTS cables. In this paper, we will report techniques and results for ac loss measurements carried out on several HTS cables with and without an HTS shielding layer. For cables without a shielding layer, care must be taken to control the effect of the magnetic fields from return currents on loss measurements. The waveform of the axial magnetic field was also measured by a small pick-up coil placed inside a two-layer cable. The temporal current distribution between the layers can be calculated from the waveform of the axial field.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	996
Ending Page	1000
Page Count	5
File Size	584763
File Format	PDF
ISSN	10518223
Volume Number	21
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Loss measurement Current measurement High temperature superconductors Voltage measurement Mechanical cables Superconducting magnets Superconducting cables superconducting cable AC loss measurement axial magnetic field current distribution
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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