Numerical modeling of twisted stacked tape cables for magnet applications

Grilli, Francesco; Zermeño, V.; Takayasu, M.

doi:10.1016/j.physc.2015.03.007

Cited by 24 publications

(16 citation statements)

References 11 publications

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“…A method to reduce AC losses of HTS tapes is by striating the tape into a large number of filaments and narrow grooves: the efficiency of this method was demonstrated with experiments and confirmed by FEM simulations in [64]. Grilli et al used the H-formulation to carry out the numerical modeling and loss analysis of a twisted stacked tape cable (TSTC) [65]. The possibility of considering the effect of contact resistances on the current distributions in HTS cables was introduced in [66].…”

Section: Ac Loss Calculationmentioning

confidence: 99%

Overview of H-Formulation: A Versatile Tool for Modeling Electromagnetics in High-Temperature Superconductor Applications

2020

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This paper reviews the modeling of high-temperature superconductors (HTS) using the finiteelement method (FEM) based on the H-formulation of Maxwell's equations. This formulation has become the most popular numerical modeling method for simulating the electromagnetic behavior of HTS, especially thanks to the easiness of implementation in the commercial finite-element program COMSOL Multiphysics. Numerous studies prove that the H-formulation is able to simulate a wide scope of HTS topologies, from simple geometries such as HTS tapes and coils, to more complex HTS devices, up to large superconducting magnets. In this paper, we review the basics of the H-formulation, its evolution from 2D to 3D, its application for calculating critical currents and AC losses as well as magnetization of HTS bulks and tape stacks. We also review the use of the H-formulation for large-scale HTS applications, its use to solve multi-physics problems involving electromagnetic-thermal and electromagnetic-mechanical couplings, and its application to study the dynamic resistance of superconductors and flux pumps. INDEX TERMSReview, H-formulation, high temperature superconductor (HTS), finite-element method (FEM).

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Section: Ac Loss Calculationmentioning

confidence: 99%

Overview of H-Formulation: A Versatile Tool for Modeling Electromagnetics in High-Temperature Superconductor Applications

2020

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“…Amongst them, the finite element method (FEM) with different formulations has been widely accepted and intensively used for its advantage in tackling complex geometries, compatibility with multidisciplinary simulations and transferability in the scientific and industrial communities [10]. In particular for HTS cables, FEM models in 2D with simplified geometries or modified equations, and 3D with full structures were developed, including Roebel [18]- [21], CORC® [22]- [24] and TSTC [25], [26].…”

Section: Introductionmentioning

confidence: 99%

Numerical Modeling of AC Loss in HTS Coated Conductors and Roebel Cable Using T-A Formulation and Comparison With H Formulation

Yan

Grilli

2021

IEEE Access

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With recent advances in second-generation high temperature superconductors (2G HTS) and cable technologies, various numerical models based on finite-element method (FEM) have been proposed to help interpret measured AC loss and assist cable design. The T-A formulation, implemented in COMSOL, shows great potential for reducing the overall computation costs. In this paper, the performance of the T-A formulation for calculating the AC loss of coated superconductors and cables were assessed and compared against the widely accepted H formulation, with benchmark model of a single REBCO tape in 2D/3D and a 14strand Roebel cable. Evaluation and comparison on key metrics including the computation time, the number of degrees of freedom and the numerical accuracy were presented, which could provide a reference for researchers in applying the T-A formulation for AC loss calculation.

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“…As simplified two-dimensional models cannot illustrate the detailed structure of HTS cables, in previous studies, three dimensional (3D) time-dependent electromagnetic models in the numerical study have been built by H-formulation, such as, the magnetization loss, magnetic shielding effects and end effects of short CORC cables are discussed by Jie Sheng et al [8] and M Majoros et al [9]. Francesco Grilli et al computed the magnetization AC losses of a twisted superconductor and current repartition among the tapes in a cable [10][11][12]. However, H-formulation is very difficult to set the boundary imposing the transport current when symmetry couldn't be used for dimensional reduction, and the high aspect ratio of superconducting tape results in huge mesh elements.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on AC Loss Properties of HTS Cable Consisting of YBCO Coated Conductor for HTS Power Devices

Qiu

Zhu

et al. 2018

IEEE Trans. Appl. Supercond.

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High-current high temperature superconducting (HTS) cables have been developed for use in HTS power devices. This paper presented the structures of HTS cables, including Conductor on Round Core (CORC) cable, Twisted Stacked-tape Conductor (TSTC) cable and Double coaxial cable. Subsequently, three dimensional (3D) finite element method numerical models were built to analyze the electromagnetic characteristics of the cables, and the critical current of the cables is about 380 Ampere @77 K, self-field. Using the T-A formulation, the numerical model assumed a sheet approximation for conductors, which shortened computational time. The T-A formulation were verified by experiments on a superconducting tape. Then HTS cables with different configurations were made, as functions of different transport current and background magnetic field, and different pitches of Double Coaxial Cable inner conducting layer. According to the results, the AC losses of Double coaxial cable and CORC cable decreased 40% than the TSTC cable with different transport current, and the Double coaxial cable AC loss decreased 20% than the CORC cable when background magnetic field was in the range of 20-60 mT. Conclusions obtained from this study will be helpful for understanding the AC loss properties of HTS cables and useful in design of HTS power devices (such as HTS transformer), using HTS cables.

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Numerical modeling of twisted stacked tape cables for magnet applications

Cited by 24 publications

References 11 publications

Overview of H-Formulation: A Versatile Tool for Modeling Electromagnetics in High-Temperature Superconductor Applications

Overview of H-Formulation: A Versatile Tool for Modeling Electromagnetics in High-Temperature Superconductor Applications

Numerical Modeling of AC Loss in HTS Coated Conductors and Roebel Cable Using T-A Formulation and Comparison With H Formulation

Numerical Study on AC Loss Properties of HTS Cable Consisting of YBCO Coated Conductor for HTS Power Devices

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