Numerical study on AC loss characteristics of superconducting power transmission cables comprising coated conductors with magnetic substrates

Amemiya, Naoyuki; Nakahata, Masaaki

doi:10.1016/j.physc.2007.04.265

Cited by 27 publications

(24 citation statements)

References 12 publications

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“…We also cannot avoid winding the tapes without gaps between the tapes in actual manufacturing of the cable. A To reduce the field perpendicular to the tape is important to obtain a low loss HTS cable [2]. Our research showed that AC loss decreased using narrow tapes for the conductor.…”

Section: Ac Loss Of Hts Cablesmentioning

confidence: 85%

Development of (RE)BCO cables for HTS power transmission lines

Mukoyama¹,

Yagi²,

Masuda³

et al. 2009

Physica C: Superconductivity

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Section: Ac Loss Of Hts Cablesmentioning

confidence: 85%

Development of (RE)BCO cables for HTS power transmission lines

Mukoyama¹,

Yagi²,

Masuda³

et al. 2009

Physica C: Superconductivity

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“…In the literature, several models with macroscopic F/S structures have been developed for calculating the field penetration and the AC losses in HTS tapes with ferromagnetic substrates or covers. They usually rely on finite-element formulation implemented on commercial software [8]- [10], [15]. In this study, we use the finite-element method (FEM) for calculating the penetration of a uniform axial magnetic field in a system comprising two coaxial tubes made of HTS and ferromagnetic materials.…”

Section: ) An Increase In the Electrical Transport Abilities In Htsmentioning

confidence: 99%

Numerical Study of the Shielding Properties of Macroscopic Hybrid Ferromagnetic/Superconductor Hollow Cylinders

Lousberg

Fagnard

Ausloos

et al. 2010

IEEE Trans. Appl. Supercond.

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Abstract-We study the magnetic shielding properties of hybrid ferromagnetic/superconductor (F/S) structures consisting of two coaxial cylinders, with one of each material. We use an axisymmetric finite-element model in which the electrical properties of the superconducting tube are modeled by a nonlinear E-J power law with a magnetic-field-dependent critical current density whereas the magnetic properties of the ferromagnetic material take saturation into account. We study and compare the penetration of a uniform axial magnetic field in two cases: 1) a ferromagnetic tube placed inside a larger superconducting tube (Ferro-In configuration) and 2) a ferromagnetic tube placed outside the superconducting one (Ferro-Out configuration). In both cases, we assess how the ferromagnetic tube improves the shielding properties of the sole superconducting tube. The influence of the geometrical parameters of the ferromagnetic tube is also studied: It is shown that, upon an optimal choice of the geometrical parameters, the range of magnetic fields that are efficiently shielded by the hightemperature superconductor tube alone can be increased by a factor of up to 7 (2) in a Ferro-Out (Ferro-In) configuration. The optimal configuration uses a 1020 carbon steel with a thickness of 2 mm and a height that is half that of the superconducting cylinder (80 mm).Index Terms-Ferromagnetic/high-temperature superconductors (HTSs) hybrid structure, finite element, magnetic shield.

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“…2,3 The magnetic behavior of ferromagnetic substrates can strongly affect the electromagnetic response of superconducting coated conductors. Although the effects of ferromagnetic substrates on ac losses of superconducting coated conductors have been extensively investigated experimentally and numerically, [4][5][6][7][8][9][10][11][12][13] ac losses in superconducting strips on ferromagnetic substrates have not been investigated analytically. Genenko et al 14 analytically investigated the magnetic field and current distributions in superconducting strips surrounded by soft magnets, but they did not consider realistic geometries similar to those of coated conductors.…”

Section: Introductionmentioning

confidence: 99%

Magnetic field distributions around superconducting strips on ferromagnetic substrates

Mawatari

2008

Phys. Rev. B

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The complex-field approach is developed to derive analytical expressions of the magnetic field distributions around superconducting strips on ferromagnetic substrates ͑SC/FM strips͒. We consider the ferromagnetic substrates as ideal soft magnets with an infinite magnetic permeability, neglecting the ferromagnetic hysteresis.On the basis of the critical state model for a superconducting strip, the ac susceptibility 1 Ј+i 1 Љ of a SC/FM strip exposed to a perpendicular ac magnetic field is theoretically investigated, and the results are compared with those for superconducting strips on nonmagnetic substrates ͑SC/NM strips͒. The real part 1 Ј for H 0 / j c d s → 0 ͑where H 0 is the amplitude of the ac magnetic field, j c is the critical current density, and d s is the thickness of the superconducting strip͒ of a SC/FM strip is 3 / 4 of that of a SC/NM strip. The imaginary part 1 Љ ͑or ac loss Q͒ for H 0 / j c d s Ͻ 0.14 of a SC/FM strip is larger than that of a SC/NM strip, even when the ferromagnetic hysteresis is neglected, and this enhancement of 1 Љ ͑or Q͒ is due to the edge effect of the ferromagnetic substrate.

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Numerical study on AC loss characteristics of superconducting power transmission cables comprising coated conductors with magnetic substrates

Cited by 27 publications

References 12 publications

Development of (RE)BCO cables for HTS power transmission lines

Development of (RE)BCO cables for HTS power transmission lines

Numerical Study of the Shielding Properties of Macroscopic Hybrid Ferromagnetic/Superconductor Hollow Cylinders

Magnetic field distributions around superconducting strips on ferromagnetic substrates

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