2D axisymmetric electromagnetic modeling of HTS coils based on T-A formulation with modified Newman boundary conditions

The T-A formulation based on thin film approximation has been widely used in electromagnetic modeling of high temperature superconducting (HTS) coated conductors (CCs). However, with the emergence of no-insulation (NI) HTS coils and its variant HTS coils, the electrical connection of HTS coils has b...

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Veröffentlicht in:Superconductor science & technology 2024-09, Vol.37 (9), p.95012
Hauptverfasser: Chen, Yong, Wang, Qiuliang, Wang, Kangshuai, Zhou, Benzhe, Liu, Shixian, Ji, Xiaoyu, Wang, Lei, Liu, Jianhua
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container_end_page
container_issue 9
container_start_page 95012
container_title Superconductor science & technology
container_volume 37
creator Chen, Yong
Wang, Qiuliang
Wang, Kangshuai
Zhou, Benzhe
Liu, Shixian
Ji, Xiaoyu
Wang, Lei
Liu, Jianhua
description The T-A formulation based on thin film approximation has been widely used in electromagnetic modeling of high temperature superconducting (HTS) coated conductors (CCs). However, with the emergence of no-insulation (NI) HTS coils and its variant HTS coils, the electrical connection of HTS coils has become increasingly complex, and the traditional T-A formulation is challenging to handle the problems of conductors with non-negligible thickness and current sharing. This paper firstly describes the Neumann boundary condition of the T-A formulation under 2D axisymmetric symmetry in detail, as well as the conversion of different boundary conditions. And additional voltage variable is added to correct the Newman boundary condition from the perspective of circuit. Then, considering HTS CCs series or parallel stacking to carry current, the effectiveness of this method is verified by comparing with benchmark model. Finally, we extend the application range of the T-A formulation with modified Newman boundary conditions to simulate thick superconductors, and naturally process current sharing of azimuthal and radial current in circular NI HTS coils.
doi_str_mv 10.1088/1361-6668/ad6718
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subjects current sharing
formulation
HTS coils
Neumann boundary condition
title 2D axisymmetric electromagnetic modeling of HTS coils based on T-A formulation with modified Newman boundary conditions
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