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Flux-transfer losses in helically wound superconducting power cables

TitleFlux-transfer losses in helically wound superconducting power cables
Publication TypeJournal Article
Year of Publication2013
AuthorsClem, JR, Malozemoff, AP
Journal Technology
Volume26
Pagination085008
Date Published08
Type of ArticleArticle
ISBN Number0953-2048
Accession NumberWOS:000321709400014
Keywordsac, conductors, hard superconductors
Abstract

Minimization of ac losses is essential for economic operation of high-temperature superconductor (HTS) ac power cables. A favorable configuration for the phase conductor of such cables has two counter-wound layers of HTS tape-shaped wires lying next to each other and helically wound around a flexible cylindrical former. However, if magnetic materials such as magnetic substrates of the tapes lie between the two layers, or if the winding pitch angles are not opposite and essentially equal in magnitude to each other, current distributes unequally between the two layers. Then, if at some point in the ac cycle the current of either of the two layers exceeds its critical current, a large ac loss arises from the transfer of flux between the two layers. A detailed review of the formalism, and its application to the case of paramagnetic substrates including the calculation of this flux-transfer loss, is presented.

DOI10.1088/0953-2048/26/8/085008
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