Hysteretic ac loss of polygonally arranged superconducting strips carrying ac transport current

Mawatari, Yasunori; Komori, Kazuhiro

doi:10.1063/1.2829793

Cited by 29 publications

(14 citation statements)

References 26 publications

(30 reference statements)

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“…1,2). The calculated self-field loss of a coated conductor in polygonal assemblies is reported to be smaller than that of a single isolated strip when calculated by the Norris equation [4][5][6]. However, as was observed in the experiment described in Section 3, the losses do not differ greatly.…”

Section: Calculationmentioning

confidence: 59%

“…The AC loss of a coated conductor in a monolayer cable is decreased when compared with that of a single isolated strip. The loss in an isolated coated conductor is primarily due to a perpendicular field, which is reduced in the gap between the strips [4][5][6]. The AC loss, including the interaction of coated conductors in an HTS cable, is calculated by the two-dimensional finite element method (2D FEM).…”

Section: Introductionmentioning

confidence: 99%

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Calculating AC Losses in High-temperature Superconducting Cables Comprising Coated Conductors

et al. 2014

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In this study, we present a new calculation model of AC loss in a high-temperature superconducting (HTS) cable comprising coated conductors. AC loss is calculated by an electric circuit (EC) model. A previous EC model had three circuit elements: resistance as a function of the layer current, inductances related to the circumferential and axial fields. The new EC model has only inductances, and resistance is eliminated. In both models, AC loss of the coated conductor in each layer of an HTS cable is calculated on the basis of the Norris equation for a thin strip. The differences between measurement and calculations using the previous and new models are 12% and 14%, respectively, when transporting 1 kA rms , which indicates that the new model is applicable for the calculation of AC loss in an HTS cable. These results indicate that layer current is dependent on inductances and not on resistance. The elimination of resistance simplifies AC loss calculation because it does not require repeated calculations for the convergence of the layer current. The calculation time was 1/20th of that of the previous model. In the new model, the Norris equation can be replaced with the calculation result obtained by the two-dimensional finite element method to obtain more accurate AC loss.

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Section: Calculationmentioning

confidence: 59%

Section: Introductionmentioning

confidence: 99%

Calculating AC Losses in High-temperature Superconducting Cables Comprising Coated Conductors

et al. 2014

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“…In reality, the tapes are interconnected [26] and also the lay angle effects on the losses in a manner, which is more complicated than our approach to scale the tape wise losses per unit length of a cable with the factor 1= cos u. Also possible ferromagnetism of the substrates effects on the losses and these aspects can be taken into account in further development.…”

Section: General Circuit Analysis Modelmentioning

confidence: 98%

Numerical minimization of AC losses in coaxial coated conductor cables

Rostila¹,

Suuriniemi²,

Lehtonen³

et al. 2010

Physica C: Superconductivity

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“…This expression for the ac loss in a single curved superconducting tape is equivalent to that for an infinite array of coplanar tapes. 11,14 When the logarithmic function in Eq. ͑18͒ is expanded as ln͑1− 1 ͒Ӎ− 1 , where 1 = cot 2 1 tan 2 ͑sF 1 ͒ Ӷ 1, we obtain…”

Section: Ac Loss In a Single Curved Tapementioning

confidence: 99%

Field distributions in curved superconducting tapes conforming to a cylinder carrying transport currents

Mawatari

2009

Phys. Rev. B

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Current and magnetic field distributions in curved superconducting tapes are investigated theoretically. The geometry of superconducting tapes considered here is a section of a cylindrical shell in which the length of tape lies parallel to the long axis of the cylinder. Analytical investigation based on the critical state model demonstrates that the current and field distributions and the ac losses in curved superconducting tapes carrying transport currents are equivalent to those in an infinite array of coplanar superconducting tapes. Bending a superconducting tape reduces the magnetic field perpendicular to the tape, resulting in a reduction of ac losses. Simple analytical formulas are presented for the hysteretic ac losses in curved superconducting tapes carrying ac transport currents.

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Hysteretic ac loss of polygonally arranged superconducting strips carrying ac transport current

Cited by 29 publications

References 26 publications

Calculating AC Losses in High-temperature Superconducting Cables Comprising Coated Conductors

Calculating AC Losses in High-temperature Superconducting Cables Comprising Coated Conductors

Numerical minimization of AC losses in coaxial coated conductor cables

Field distributions in curved superconducting tapes conforming to a cylinder carrying transport currents

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