Analysis of Shielding Layers in HTS Cable Taking Account of Spiral Structure

Nakamura, Taketsune; Higashikawa, Kohei; Hoshino, Tsutomu; Muta, Itsuya

doi:10.1109/tasc.2005.849272

Cited by 8 publications

(4 citation statements)

References 9 publications

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“…The calculated examples are power-transmission cables made of tapes with finite thickness [154], [32], [56], multifilamentary twisted wires [55], two rectangular prisms connected by a normal metal [32], a permanent magnet moving on a thick superconductor [66], a finite cylinder in a transverse applied field [48], a cylinder with several holes [65] and an array of cylinders or rectangular prisms [56].…”

Section: ) Rotating Fieldsmentioning

confidence: 99%

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Computation of Losses in HTS Under the Action of Varying Magnetic Fields and Currents

Grilli

Pardo

Stenvall

et al. 2014

IEEE Trans. Appl. Supercond.

314

272

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Numerical modeling of superconductors is widely recognized as a powerful tool for interpreting experimental results, understanding physical mechanisms and predicting the performance of high-temperature superconductor (HTS) tapes, wires and devices. This is especially true for ac loss calculation, since a sufficiently low ac loss value is imperative to make these materials attractive for commercialization. In recent years, a large variety of numerical models, based on different techniques and implementations, have been proposed by researchers around the world, with the purpose of being able to estimate ac losses in HTSs quickly and accurately. This article presents a literature review of the methods for computing ac losses in HTS tapes, wires and devices. Technical superconductors have a relatively complex geometry (filaments, which might be twisted or transposed, or layers) and consist of different materials. As a result, different loss contributions exist. In this paper, we describe the ways of computing such loss contributions, which include hysteresis losses, eddy current losses, coupling losses, and losses in ferromagnetic materials. We also provide an estimation of the losses occurring in a variety of power applications.

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Section: ) Rotating Fieldsmentioning

confidence: 99%

“…Ac loss calculations for cables made of Bi-2223 tapes require 3-D models (see Fig. 5b), resulting in a high computing complexity so that only coarse meshes are considered [154], [32]. More recent models for coated conductors improve the accuracy by reducing the problem to a mathematically 1-D [155] or 2-D [59], [55] one.…”

Section: ) Power-transmission Cablesmentioning

confidence: 99%

Computation of Losses in HTS Under the Action of Varying Magnetic Fields and Currents

Grilli

Pardo

Stenvall

et al. 2014

IEEE Trans. Appl. Supercond.

314

272

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show abstract

“…The first author's group has also performed the analytical study with the use of the above-mentioned model for HTS coils [19][20][21][22][23][24][25] and HTS cables 26,27) . In this paper, variables T i and e i are not subjected to the consideration.…”

Section: Current Transport Property Of Hts Apparatusesmentioning

confidence: 99%

Longitudinal inhomogeneity of DC current transport properties in Gd-system HTS tapes – Statistical approach for system design

et al. 2014

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In this paper, we studied the DC current transport properties of GdBCO-coated conductors, including the longitudinal distribution of critical current. Inhomogeneity of the local critical current was firstly measured by means of TapeStar™ at 77 K, and then characterized based on a statistical method. Current transport properties were also measured for different positions and/or distances of potential taps using a four-probe method. It was shown that the longitudinal inhomogeneity of the conductor was described by use of a simplified percolation depinning model that takes account of Gaussian distribution. We further distinguished the above-mentioned inhomogeneity between statistical distribution and random failure. Influence of the aforementioned statistically distributed current transport properties on the magnet performance was also elucidated for simple pancake coils. This information is important as it provides guidance for practical system design.

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“…(1) Electric field E (μV/m) [19][20][21][22][23][24][25][26][27] ࠾࠸࡚᭱ಙᆇᛶࡢ࠸ ো౯ᘧࡋ࡚ᮌᅢࡢ࣮ࢥ࣮ࣞࢩࣙࣥഴ⛣ࣔࢹࣝ [14][15][16] ⏝ࡋ࡚ࡁࡓࠋࡋࡋ࡞ࡀ ᭱Ǻⓗࡣୖঠࣔࢹࣝ ( )…”

Section: ୍᪉ᮏ÷࡛ࡍ࿇ᡭ᪉ྥᆒ୍ᛶࡣᕧख़ⓗ࡞ोᅉunclassified

Longitudinal Inhomogeneity of DC Current Transport Properties in Gd-system HTS Tapes

Nakamura¹,

Takamura²,

Amemiya³

et al. 2013

TEION KOGAKU

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Synopsis:In this paper, we studied the DC current transport properties of GdBCO-coated conductors, including the longitudinal distribution of critical current. Inhomogeneity of the local critical current was firstly measured by means of TapeStar™ at 77 K, and then characterized based on a statistical method. Current transport properties were also measured for different positions and/or distances of potential taps using a four-probe method. It was shown that the longitudinal inhomogeneity of the conductor was described by use of a simplified percolation depinning model that takes account of Gaussian distribution.We further distinguished the above-mentioned inhomogeneity between statistical distribution and random failure. Influence of the aforementioned statistically distributed current transport properties on the magnet performance was also elucidated for simple pancake coils. This information is important as it provides guidance for practical system design.

show abstract

Analysis of Shielding Layers in HTS Cable Taking Account of Spiral Structure

Abstract: Index Terms-Finite element method, HTS cable, multifilamentary structure, percolation depinning model, spiral structure.

Cited by 8 publications

References 9 publications

Computation of Losses in HTS Under the Action of Varying Magnetic Fields and Currents

Computation of Losses in HTS Under the Action of Varying Magnetic Fields and Currents

Longitudinal inhomogeneity of DC current transport properties in Gd-system HTS tapes – Statistical approach for system design

Longitudinal Inhomogeneity of DC Current Transport Properties in Gd-system HTS Tapes

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