Investigation of the effect of non-uniform stress distribution on the transient electromagnetic behavior of a no-insulation REBCO racetrack coil

Liu, Shixian; Wang, Lei; Chen, Yong; Zhou, Benzhe; Wang, Luzhong; Ji, Xiaoyu; Hu, Xinning; Wang, Qiuliang

doi:10.1016/j.physc.2023.1354403

Cited by 4 publications

(1 citation statement)

References 30 publications

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“…Appropriate contact resistivity can mitigate the risk of burnout by enabling the current to bypass localized hotspots or defects in the cable and flow into other tapes through the contact interface. Various factors, such as heat treatment [29,30], contact pressure [58,59], and surface roughness [60] can significantly affect the contact resistivity in CORC cable. For instance, the contact resistivity can decrease by two orders of magnitude when the Pb-Sn solder layer is melted [29].…”

Section: Current Sharing Behaviors Of Corc Cablementioning

confidence: 99%

Modeling of contact resistivity and simplification of 3D homogenization strategy for the H formulation

Wang,

Yong,

Zhou

2024

Supercond. Sci. Technol.

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The finite element method (FEM) provides a powerful support for the calculations of superconducting electromagnetic responses. It enables the analysis of large-scale high-temperature superconducting (HTS) systems by the popular H formulation. Nonetheless, modeling of contact resistivity in three-dimensional (3D) FEM is still a matter of interest. The difficulty stems from the large aspect ratio of the contact layer in numerical modeling. Nowadays, an available solution is to model the contact layer with zero thickness but requires the discontinuity conditions of the magnetic field. In this paper, the energy variational method is utilized to incorporate the contribution of contact resistivity into the H formulation. From the perspective of energy transfer, the contact resistivity is related to the energy dissipation of the radial current flowing through the contact interface. In terms of applications, this method can be employed to calculate the charging delay of no-insulation (NI) coils and the current sharing behaviors of CORC cables. One advantage of this model is that the magnetic field is continuous and hence can be easily implemented in FEM. Additionally, it requires fewer degrees of freedom and hence presents advantages in computational efficiency. Moreover, this method can be employed to simplify the 3D H homogeneous model for insulated coils. The above discussions demonstrate that the proposed model is a promising tool for the modeling of contact resistivity.

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Section: Current Sharing Behaviors Of Corc Cablementioning

confidence: 99%

Modeling of contact resistivity and simplification of 3D homogenization strategy for the H formulation

Wang,

Yong,

Zhou

2024

Supercond. Sci. Technol.

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Investigation of the effect of difference in the characteristic resistance of DP coils on the field and losses of MI HTS magnets

Liu,

Wang,

Chen

et al. 2024

Physica C: Superconductivity and its Applications

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

Chen,

Wang,

Wang

et al. 2024

Supercond. Sci. Technol.

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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.

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Investigation of the effect of non-uniform stress distribution on the transient electromagnetic behavior of a no-insulation REBCO racetrack coil

Cited by 4 publications

References 30 publications

Modeling of contact resistivity and simplification of 3D homogenization strategy for the H formulation

Modeling of contact resistivity and simplification of 3D homogenization strategy for the H formulation

Investigation of the effect of difference in the characteristic resistance of DP coils on the field and losses of MI HTS magnets

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

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