Numerical minimization of AC losses in coaxial coated conductor cables

Rostila, L.; Suuriniemi, Saku; Lehtonen, J.; Grasso, G.

doi:10.1016/j.physc.2009.12.043

Cited by 2 publications

(2 citation statements)

References 28 publications

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“…Simulations for tapes with a ferromagnetic substrate show that its presence always increases the ac losses [145], [146]. In multi-layer cables, the twist pitch of the tapes strongly influences the current sharing between layers [147]. One reasonable approximation is to assume that the twist pitch is optimum, so that all the tapes carry the same current independently of the layer that they belong to [148], [149], [150].…”

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.

305

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.

305

272

View full text Add to dashboard Cite

show abstract

“…In [15][16][17] the authors again point out the importance of the tape width and the width of the gap between the tapes for single-and multi-layer cable. The lay angle of tapes was optimized in [18]. However, we neglect this effect in this work; straight tapes are assumed in the calculations.…”

Section: Introductionmentioning

confidence: 99%

Critical current and AC loss analysis of a superconducting power transmission cable with ferromagnetic diverters

Vojenčiak

Šouc

Gömöry

2011

Supercond. Sci. Technol.

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Superconducting transmission cables are important for increasing the capability of electricity networks. We analysed monolayer power transmission cable based on high-temperature superconductors, and we propose a new way to improve its performance in this paper. We studied two important parameters of this cable—critical current and AC loss. For the former parameter, the dependence of the critical current density on the local magnetic field is very important. For the latter parameter, the direction of the magnetic field penetration also has a substantial influence. We propose placing ferromagnetic diverters above the gaps between individual superconducting tapes. Ferromagnetic components placed in this position influenced both the critical current density and the AC loss in the superconductor in a positive way. We used a numerical model for magnetic field analysis, and we also prepared a 0.5 m long sample of the cable for experimentation. Our experimental results confirmed the correctness of the basic idea. The critical current of the cable was increased by 14%. However, the AC loss measurement showed differences between the experiment and the calculation.

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Numerical minimization of AC losses in coaxial coated conductor cables

Cited by 2 publications

References 28 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

Critical current and AC loss analysis of a superconducting power transmission cable with ferromagnetic diverters

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