Transport AC loss characteristics of a nine strand YBCO Roebel cable

Jiang, Zhenan; Badcock, Rodney A.; Long, N.J.; Staines, M.P.; Thakur, K.P.; Lakshmi, L. Seetha; Wright, A. C.; Hamilton, Kent; Sidorov, Gennady; Buckley, R. G.; Amemiya, Naoyuki; Caplin, A.D.

doi:10.1088/0953-2048/23/2/025028

Cited by 36 publications

(41 citation statements)

References 20 publications

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“…The model also showed that by correctly transposing the strands, the average loss in each strand was reduced to a factor of 2.5 times that for a single stand. Similar experimental and simulation results have been observed in YBCO Roebel cables [13,14].…”

Section: Modelling and Simulationsupporting

confidence: 86%

Resistive superconducting fault current limiter AC loss measurements and analysis

Pei

Zeng

Smith

et al. 2016

IEEE Trans. Appl. Supercond.

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Resistive superconducting fault current limiters (SFCL's) offer the advantages of low weight and compact structure. Multi-strand Magnesium Diboride (MgB 2) wire can be used in SFCL coil design to increase the transport current capacity. A monofilament 0.36 mm MgB 2 wire with a stainless steel sheath was used to build three SFCL coils with 3 strands, 16 (9+7) strands and 50 (28+22) strands of the MgB 2 wire. The quench current level and AC losses in the MgB 2 wire are critical design parameters for a resistive SFCL. The experimental results showed the measured quench current densities reduced as the strand number increased and the AC losses increased as the strand number increased. An axisymmetric 2D finite element (FE) model therefore was built to analyze the current distribution and the AC losses in the coil. The multi-stranded coil FE model showed that proximity effect can modify the current distribution in the strands. This not only reduces the current carrying ability, but also increases the AC losses non-linearly. The FE model confirmed the issues highlighted by the experimental testing. Finally a winding method for multi-strand coil has been proposed to reduce the impact of these effects.

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Section: Modelling and Simulationsupporting

confidence: 86%

Resistive superconducting fault current limiter AC loss measurements and analysis

Pei

Zeng

Smith

et al. 2016

IEEE Trans. Appl. Supercond.

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“…Hence, each strand occupies all different locations of the double stack configuration. Therefore, all strands are electrically equivalent and should carry the same current and they should also have same transport ac loss [2,3]. In order to implement the constraint of equal current in the strands of Roebel cable, the current in the central strands is not allowed to exceed the current in the surface strands.…”

Section: Magnetic Field and Current Distributionmentioning

confidence: 99%

“…For HTS applications the current capacity of given wire at different temperatures and fields, I c (B, T, H), is usually scaled from 77 K, self-field, values. For HTS Roebel cable, composed of multiple strands of conductor, the 77 K critical current is strongly affected by the self-field [3][4][5]. To design devices using Roebel cable it is useful to understand the effect of self-field on the 77 K measurement in some detail.…”

Section: Introductionmentioning

confidence: 99%

Current carrying capability of HTS Roebel cable

Thakur¹,

Jiang²,

Staines³

et al. 2011

Physica C: Superconductivity

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“…As a consequence, they may not be representative for the present nano-engineered material [16,17,18]. For Roebel cables there are also measurements for perpendicular applied fields [20,33,7,27], parallel ones [34] and transport currents [20,35].In this article, we simulate and discuss the AC loss due to an applied magnetic field at an arbitrary angle with the cable and we take into account a…”

mentioning

confidence: 99%

Numerical simulations of the angular dependence of magnetization AC losses: coated conductors, Roebel cables and double pancake coils

Pardo

Grilli

2011

Supercond. Sci. Technol.

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The AC loss in ReBCO coated conductors is large in situations when the conductors are subjected to a considerable magnetic field, like in rotating machines, transformers and high-field magnets. Roebel cables can reduce the AC loss in these cases. However, computer simulations are needed to interpret the experiments, understand the loss mechanisms, reduce the AC loss by optimising the Roebel cable and design the cryogenic system. In this article, we simulate and discuss the AC loss due to an applied magnetic field making an arbitrary angle with the cable and taking into account a realistic anisotropic field dependence of the critical current density. We study the AC loss in the superconductor parts for the limits of very high coupling currents and completely uncoupled strands. The simulations for the uncoupled case also describe a double pancake coil with no transport current. For the simulations, we use two different numerical methods with complementary strengths. This serves as a mutual check of the correctness of the simulation results, which agree to each other. Opposite than expected, we found that the AC loss does not only depend on the perpendicular component of the applied magnetic field. We also found that the AC loss for applied fields with an orientation below 7 degrees with the strands surface is reduced more than one order of magnitude comparing to an untransposed cable. Therefore, we recommend to use Roebel cables for windings with important parallel components of the magnetic field, such as transformers and high-field magnets.

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Transport AC loss characteristics of a nine strand YBCO Roebel cable

Cited by 36 publications

References 20 publications

Resistive superconducting fault current limiter AC loss measurements and analysis

Resistive superconducting fault current limiter AC loss measurements and analysis

Current carrying capability of HTS Roebel cable

Numerical simulations of the angular dependence of magnetization AC losses: coated conductors, Roebel cables and double pancake coils

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