AC loss of a high- superconducting power-cable conductor

Noji, H.

doi:10.1088/0953-2048/10/8/004

Cited by 25 publications

(5 citation statements)

References 11 publications

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“…Another useful model is the electrical circuit model [310], [311], which models cables with resistances and inductances connected in series and in parallel. The resistances are calculated from Norris equation, while the inductances are calculated from self and mutual inductance formulas.…”

Section: Electrical Power Applicationsmentioning

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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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: Electrical Power Applicationsmentioning

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 values of the linear self-and mutual inductances L se and M i j are solely given by the geometry of the cable. We have calculated them according to the following formulae based on the energy stored in the cable [14,15]:…”

Section: Equivalent Circuit Modelmentioning

confidence: 99%

Prediction of resistive and hysteretic losses in a multi-layer high-T_csuperconducting cable

Grilli

Sjöström

2004

Supercond. Sci. Technol.

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In this work, a model of a multi-layer high-Tc superconducting (HTS) cable that computes the current distribution across layers as well as the AC loss is presented. The case of a four-layer cable is analysed, but the method developed can be applied to a cable with an arbitrary number of layers. The cable is modelled by an equivalent circuit consisting of the following elements: nonlinear resistances, linear self- and mutual inductances, as well as nonlinear, hysteretic inductances. The first element takes into account the typical current–voltage relation for superconductors, the second introduces coupling among the layers and depends on the geometrical parameters of the cable, while the third describes the hysteretic behaviour of superconductors. In the analysis presented, the geometrical dimensions of the cable are fixed, except for the pitch length and the winding orientation of the layers. These free parameters are varied in order to partition the current across the layers such that the AC loss in the superconductor is minimized. The model presented allows us to evaluate rapidly the current distribution across the different layers and to compute the corresponding AC loss. The rapidity of the computation allows us to calculate the losses for many different configurations within a reasonable time. The model has first been used for finding the pitch lengths giving an optimal current distribution across the layers and for computing the corresponding AC loss. Second, the model has been refined, taking into account the effects of the magnetic self-field which, especially at high currents, can sensibly reduce the transport capacity of the cable, in particular in the outer layers.

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“…The second (1.0 < i < 1.8) and third (i 1.8) region may be caused by flux flow and resistance of Ag substrates, respectively. The existence of three regions in the ac loss property has been also observed in the property of Bi-2223 multifilamentary tape [13].…”

Section: Resultsmentioning

confidence: 68%

Fabrication and electrical properties of a high-T_csuperconducting layered conductor

Noji¹

1999

Supercond. Sci. Technol.

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A high-Tc superconducting layered conductor designed for a small cross-section and a relatively low current capacity is fabricated by Bi-2212 tapes and interlayer insulation. The Bi-2212 tapes are prepared by the screen-printing method and the melt-solidification process with slow cooling under monotonically reduced oxygen partial pressure. Fifteen tapes with Tc value90 K and Jc value 1 × 104 A cm-2 at 77 K and 0 T are selected to construct the conductor. Dc and ac transport measurements of the conductor show that the Ic value is 250 A which is decreased by 17% from an estimation, and the ac loss is described by the Norris equation in the elliptical approximation at the normalized current i < 0.7 even though the cross-section is a rectangle.

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AC loss of a high- superconducting power-cable conductor

Cited by 25 publications

References 11 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

Prediction of resistive and hysteretic losses in a multi-layer high-T_csuperconducting cable

Fabrication and electrical properties of a high-T_csuperconducting layered conductor

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AC loss of a high- superconducting power-cable conductor

Cited by 25 publications

References 11 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

Prediction of resistive and hysteretic losses in a multi-layer high-Tcsuperconducting cable

Fabrication and electrical properties of a high-Tcsuperconducting layered conductor

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Product

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Prediction of resistive and hysteretic losses in a multi-layer high-T_csuperconducting cable

Fabrication and electrical properties of a high-T_csuperconducting layered conductor