High temperature superconductor (HTS) cables

Schlachter, S.I.; Goldacker, W.

doi:10.1533/9780857095299.1.69

Cited by 2 publications

(2 citation statements)

References 33 publications

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“…In design of magnet coils from high temperature superconductor (HTS) REBCO tapes, it is often necessary to consider assembling the tapes into specific cable design [1][2][3]. Several concepts have been developed for this purpose, resulting in quite different shape and electrical properties [4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Impact of local geometrical irregularities on critical currents of REBCO tapes in round cables

Kujovič¹,

Gömöry²

2020

Supercond. Sci. Technol.

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REBa2Cu3O7-x (RE—rare earth, Ba—barium, Cu—copper, O—oxygen) tapes used in common multilayer superconducting cables, such as Roebel cable, twisted stacked tape cable or vonductor on round core/tube (CORC ® /CORT), undergo shape modifications during the cable production. In particular, the tapes edges are regularly raised due to the Poisson effect during bending of tapes in the cable assembling process. This kind of deformation amplifies the local strain in subsequent layers, endangering the capability to transport electrical current. We explore such deformation by numerical and analytical calculations validated by experiments. Three-point bending device submerged in liquid nitrogen was developed for this purpose. We found that, if the orientation of Poisson effect deformations is along the tape length, the local strain is reduced and performance of the cable remains unaffected. In contrary, the local deformations at the crossings of tapes from subsequent layers represent a serious threat towards reaching a satisfactory critical current retention.

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Section: Introductionmentioning

confidence: 99%

Impact of local geometrical irregularities on critical currents of REBCO tapes in round cables

Kujovič¹,

Gömöry²

2020

Supercond. Sci. Technol.

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“…In a first step a single 4 mm SuperPower REBCO tape is simulated and the dependence of the critical current density on the strength and angle of a magnetic background field calculated. The calculated data are compared to in-field critical current measurements [29] of such HTS tapes.…”

Section: Simulation Methodsmentioning

confidence: 99%

Electro-mechanical analysis of Roebel cables with different geometries

Barth

Weiss

Vojenčiak

et al. 2011

Supercond. Sci. Technol.

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For future fusion applications, superconducting motors and generators, HTS Roebel cables with high effective current densities are desired. Due to the enormous Lorentz forces of fusion magnets or the centrifugal forces of rotors, these cables must also be able to withstand high mechanical loads. Coated conductor material can sustain high tensile loads; however, the meander structure needed for Roebel assembled cables concentrates mechanical stress at the crossing sections. This weakens the tape mechanically and makes it prone to failure in these regions. The increase in mechanical sensitivity depends on geometric parameters such as angle, width and inner radius of the Roebel structure and can be reduced by an optimized geometry. In this paper Roebel cables with varying geometries were investigated mechanically and electrically. Firstly, different meander structure geometries were analyzed using 3D finite element method (FEM) models to evaluate their resistance to tensile loads and the minimal possible transposition length. Secondly, the electro-magnetic properties of the 2D cross section of a Roebel cable were investigated with FEM simulations. These simulations were used to derive an improvement of the meander structure which permits almost the same twist pitch, but increases the mechanical stability and the current carrying capabilities of the whole Roebel assembled cable.

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High temperature superconductor (HTS) cables

Cited by 2 publications

References 33 publications

Impact of local geometrical irregularities on critical currents of REBCO tapes in round cables

Impact of local geometrical irregularities on critical currents of REBCO tapes in round cables

Electro-mechanical analysis of Roebel cables with different geometries

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