AC Loss Measurements in a Hybrid REBCO/BSCCO Coil Assembly
journal contribution
posted on 2021-03-29, 02:06 authored by Zhenan JiangZhenan Jiang, M Staines, Nicholas LongNicholas Long, Rodney BadcockRodney Badcock, Christopher BumbyChristopher Bumby, Robert BuckleyRobert Buckley, W Song, N AmemiyaWire cost and ac loss are paramount issues for the future uptake of high-temperature superconductor (HTS) ac machines. In particular, new approaches which reduce the total manufacturing cost of HTS coils are critical to the future commercial uptake of HTS technology. Here, we present the results of ac loss measurements of a hybrid HTS coil assembly comprising end windings (EWs) wound with BSCCO wire and a central winding (CW) wound with REBCO wire. As a cost mitigation measure, we have chosen to use REBCO wire which possesses a relatively low self-field Ic at 77 K, equating to approximately half that of the BSCCO wire. Transport ac loss measurements were made on the total coil assembly at both 77 K and 65 K, using a recently developed lockin amplifier approach. We show the ac losses in the assembly at these temperatures scale with the overall transport critical current threshold of the hybrid coil assembly. The results are then compared with a reference coil assembly having similar geometrical dimensions, and in which both the EWs and CW were wound with identical BSCCO wire. Surprisingly, we observe that the ac loss of the hybrid coil is lower than that of the BSCCO coil, despite the CW of the hybrid coil employing wire a lower overall average Ic. We attribute this effect to the lower ac loss of coated conductor REBCO wire under parallel field, which is the dominant field orientation in the CW region. Based on this observation, we conclude that the hybrid assembly design is a good design strategy for HTS coil assemblies, enabling both wire cost and ac loss to be balanced.
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Preferred citation
Jiang, Z., Staines, M., Long, N., Badcock, R., Bumby, C., Buckley, R., Song, W. & Amemiya, N. (2017). AC Loss Measurements in a Hybrid REBCO/BSCCO Coil Assembly. IEEE Transactions in Applied Superconductivity, 27(6). https://doi.org/10.1109/TASC.2017.2721978Publisher DOI
Journal title
IEEE Transactions in Applied SuperconductivityVolume
27Issue
6Publication date
2017-01-01Pagination
(7)Publisher
IEEEPublication status
PublishedContribution type
ArticleISSN
1051-8223eISSN
1558-2515Article number
5900707Language
enUsage metrics
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Keywords
AC losscoil assemblyhigh-temperature super-conductor (HTS)Science & TechnologyTechnologyPhysical SciencesEngineering, Electrical & ElectronicPhysics, AppliedEngineeringPhysicsCONDUCTORSTAPESGeneral PhysicsElectrical and Electronic EngineeringMaterials EngineeringInterdisciplinary Engineering not elsewhere classifiedElectronic and Magnetic Properties of Condensed Matter; SuperconductivityCondensed Matter PhysicsEngineering Instrumentation
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