Alternating current loss of second-generation high-temperature superconducting coils with magnetic and non-magnetic substrate

Zhang, Min; Kvitkovič, J.; Kim, Jae Ho; Kim, C. H.; Pamidi, Sastry; Coombs, Tim

doi:10.1063/1.4749275

Cited by 65 publications

(42 citation statements)

References 20 publications

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“…However, superconducting samples are typically inhomogenous at a morphological level much coarser than the crystals they are made of: bulk superconductors [3,4,5,6,7,8], wires [9], tapes [10,11], and coated superconductors [12,13,14] display different levels of "granularity". For example, BSCCO-Ag tapes consist in filaments made from superconducting grains that are very well connected along the wide face of the tape, embedded in a non-superconducting matrix.…”

Section: Introductionmentioning

confidence: 99%

In-plane transport anisotropy in BSCCO-Ag multi-filamentary tapes

Borroto

García-Gordillo

Río

et al. 2015

Supercond. Sci. Technol.

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Abstract. Composite structures such as High-Tc multi-filamentary tapes display a complex anisotropy arising from the combination of the "intrinsic" anisotropy of the Bi-2223 grains, and that associated to the superconducting phase distribution in the superconductor-metal composite, as well as cracks and other defects. In this paper we characterize the "in-plane" anisotropy of BSCCO-Ag tapes, i.e., the difference between the transport properties along the longitudinal axis and those along the transverse direction also lying on the wide face of the tape. In particular, we demonstrate that the dissipation associated to transport along the transverse direction approaches that of the longitudinal direction as the temperature or the current increase, which may be relevant to transport applications in situations where the superconducting properties have significantly degraded.PACS numbers: 84.71. Mn, 74.25.Sv

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Section: Introductionmentioning

confidence: 99%

In-plane transport anisotropy in BSCCO-Ag multi-filamentary tapes

Borroto

García-Gordillo

Río

et al. 2015

Supercond. Sci. Technol.

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“…The influence of the ferromagnetic (FM) material on the transport AC loss of HTS tapes, monolayer cables, and coils was extensively studied both experimentally and theoretically [17][18][19][20][21][22][23]. For the works on twolayer HTS cables made of coated conductors with a ferromagnetic substrate, Amemiya et al [24] performed numerical AC loss calculations of two-layer superconducting power transmission cables comprising coated conductors with a ferromagnetic substrate concerning the arrangement with respect to the cable axis.…”

Section: Introductionmentioning

confidence: 99%

Numerical study of AC loss of two-layer HTS power transmission cables composed of coated conductors with a ferromagnetic substrate

Yıldız¹,

İnanır²,

Çiçek³

et al. 2017

Turk J Elec Eng & Comp Sci

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This work includes the simulation of hysteretic AC losses in two-layer HTS power transmission cables made of second-generation high-temperature superconducting tapes with a ferromagnetic substrate subject to an oscillating AC transport current, calling upon the COMSOL Multiphysics finite-element software program and exploiting an AC/DC module. How the AC transport loss is influenced by the arrangement of tapes, as well as the optimized design of superconducting power cables based on YBCO-coated conductors, are investigated. According to the radial arrangement of the tapes, four different orientations of ferromagnetic substrate are considered: 1) out-in (substrate of inner/outer layer facing outward/inward), 2) in-out (substrate of inner/outer layer facing inward/outward), 3) in-in (substrates of both inner and outer layers facing inward), and 4) out-out (substrates of both inner and outer layers facing outward).We found that the AC loss of the superconducting layer for the out-in arrangement is the lowest. We also compare our calculations with experimental results.

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“…The field dependence of the relative magnetic permeability and constant relative magnetic permeability in the ferromagnetic substrate are used to study the AC losses of coated conductors. [25][26][27][28][29][30][31] Furthermore, some researchers also employed the complex field method to study the electromagnetic behaviors in superconducting strips with magnetic substrate. [32][33][34] Some classic and novel methods available in the literature could be used to carry out electromagnetic modeling of superconductors.…”

Section: Introductionmentioning

confidence: 99%

“…2,35,36 The H-formulation is one typical method which was usually adopted to simulate the electromagnetic behaviors of superconductors. 26,[37][38][39][40][41][42][43][44][45] This formulation has some advantages for the electromagnetic modeling, such as the excellent convergence for the high-aspect ratio case and easy implement in commercial finite element method software. However, the time consumed increases obviously with the number of elements.…”

Section: Introductionmentioning

confidence: 99%

Effect of the magnetic material on AC losses in HTS conductors in AC magnetic field carrying AC transport current

et al. 2015

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This paper presents an investigation on the AC losses in several typical superconducting composite conductors using the H-formulation model. A single superconducting strip with ferromagnetic substrate or cores and a stack of coated conductors with ferromagnetic substrates are studied. We consider all the coated conductors carrying AC transport currents and simultaneously exposed to perpendicular AC magnetic fields. The influences of the amplitude, frequency, phase difference and ferromagnetic materials on the AC losses are investigated. The results show that the magnetization losses of single strip and stacked strips have similar characteristics. The ferromagnetic substrate can increase the magnetization loss at low magnetic field, and decrease the loss at high magnetic field. The ferromagnetic substrate can obviously increase the transport loss in stacked strips. The trends of total AC losses of single strip and stacked strips are similar when they are carrying current or exposed to a perpendicular magnetic field. The effect of the frequency on the total AC losses of single strip is related to the amplitude of magnetic field. The AC losses decrease with increasing frequency in low magnetic field region while increase in high magnetic field region. As the phase difference changes, there is a periodic variation for the AC losses. Moreover, when the strip is under only the transport current and magnetic field, the ferromagnetic cores will increase the AC losses for large transport current or field.

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Alternating current loss of second-generation high-temperature superconducting coils with magnetic and non-magnetic substrate

Cited by 65 publications

References 20 publications

In-plane transport anisotropy in BSCCO-Ag multi-filamentary tapes

In-plane transport anisotropy in BSCCO-Ag multi-filamentary tapes

Numerical study of AC loss of two-layer HTS power transmission cables composed of coated conductors with a ferromagnetic substrate

Effect of the magnetic material on AC losses in HTS conductors in AC magnetic field carrying AC transport current

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