Fast Numerical Computation of Current Distribution and AC Losses in Helically Wound Thin Tape Conductors: Single-Layer Coaxial Arrangement

Siahrang, Majid; Sirois, Frédéric; Nguyen, Doan N.; Babić, Slobodan; Ashworth, S.P.

doi:10.1109/tasc.2010.2078813

Cited by 15 publications

(12 citation statements)

References 12 publications

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“…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. 5) Roebel cables: Roebel cables are compact transposed cables for windings that require high currents (figure 6).…”

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.

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317

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: ) 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.

Self Cite

317

272

View full text Add to dashboard Cite

show abstract

“…The I c characterization was performed on a single phase, where the 22 Bi-2223 tapes are connected in series (by means of return copper conductors) to make sure that the same current flows in all the tapes and the current repartition is not unbalanced due to the influence of the contact resistance, as it is common on short cable samples. The polygonal arrangement of the tapes around a central cylindrical former is known to have a positive effect on the transport properties of the tapes due to the partial cancellation of the field component perpendicular to the tapes [20].…”

Section: Bi-2223 Power Cablementioning

confidence: 99%

Self-Consistent Modeling of the <formula formulatype="inline"><tex Notation="TeX">$I_{c}$</tex></formula> of HTS Devices: How Accurate do Models Really Need to Be?

Grilli

Sirois

Zermeño

et al. 2014

IEEE Trans. Appl. Supercond.

132

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Numerical models for computing the effective critical current of devices made of high-temperature superconducting tapes require the knowledge of the J c (B, θ) dependence, i.e., of the way the critical current density J c depends on the magnetic flux density B and its orientation θ with respect to the tape. In this paper, we present a numerical model based on the critical state with angular field dependence of J c to extract the J c (B, θ) relation from experimental data. The model takes into account the self-field created by the tape, which gives an important contribution when the field applied in the experiments is low. The same model can be also used to compute the effective critical current of devices composed of electromagnetically interacting tapes. In this paper, we consider three examples: two differently current-rated Roebel cables composed of ten strands from REBCO coated conductors and a power cable prototype composed of 22 Bi-2223 tapes. The critical currents computed with the numerical model show good agreement with the measured ones. The simulations reveal also that several parameter sets in J c (B, θ) give an equally good representation of the experimental characterization of the tapes and that the measured I c values of cables are subjected to the influence of experimental conditions, such as I c degradation due to the manufacturing and assembling process and nonuniformity of the tape properties. These two aspects make the determination of a very precise J c (B, θ) expression probably unnecessary, as long as that expression is able to reproduce the main features of the observed angular dependence. The easiness of use of this model, which can be straightforwardly implemented in finite-element programs able to solve static electromagnetic problems, is very attractive both for researchers and device manufactures who want to characterize superconducting tapes and calculate the effective critical current of superconducting devices.

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“…In this model, we do not consider the nonsuperconducting layers of the tapes, and the superconductor layer is modeled as an infinitely thin current sheet. This method is explained in detail in [11] and its accuracy has been verified by comparisons with experiments.…”

Section: Numerical Modelmentioning

confidence: 94%

“…In this paper, for the same number of tapes with the same characteristics used in [10], we investigate the impact of the helical configuration of the tapes on the AC loss behavior with the idea of overlapping the tapes. To consider the helical configuration of the tapes, we use a numerical model developed in our previous work [7,11] to find current distributions and AC losses in helically wound thin tape conductors. In addition to the previously introduced overlapped design (which here is renamed as cyclic overlapped design) we consider two other alternative overlap designs to reduce the edge losses in HTS power cable.…”

Section: Introductionmentioning

confidence: 99%

Assessment of alternative design schemes to reduce the edge losses in HTS power transmission cables made of coated conductors

Siahrang¹,

Sirois²,

Nguyen³

et al. 2011

Supercond. Sci. Technol.

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In this paper, we investigate the effectiveness of alternative designs to reduce the AC losses of high temperature superconducting (HTS) power transmission cables. The idea behind these designs is to undermine the edge effect, which is one of the main factors contributing to AC losses in HTS power cables made of coated tapes. The edge effect, which arises from the presence of gaps between the tapes, results in large normal components of magnetic field near the edges of the tapes and in turns leads to a current distribution with higher density near the edges. To perform our investigation we use a numerical technique developed in our previous work which allows us to consider the helical configuration of the tapes. Through numerical simulations we assess the effectiveness of two overlapped designs, i.e. a cyclic overlapped design and an anticyclic overlapped design, in reduction of AC losses in single layer HTS power cables made of coated tapes. Simulation results show that AC losses can be reduced by about 70% as compared with a typical single layer cable.

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Fast Numerical Computation of Current Distribution and AC Losses in Helically Wound Thin Tape Conductors: Single-Layer Coaxial Arrangement

Cited by 15 publications

References 12 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

Self-Consistent Modeling of the <formula formulatype="inline"><tex Notation="TeX">$I_{c}$</tex></formula> of HTS Devices: How Accurate do Models Really Need to Be?

Assessment of alternative design schemes to reduce the edge losses in HTS power transmission cables made of coated conductors

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