Investigation of REBCO Twisted Stacked-Tape Cable Conductor Performance

Takayasu, M.; Chiesa, L.; Minervini, J.V.

doi:10.1088/1742-6596/507/2/022040

Cited by 11 publications

(5 citation statements)

References 7 publications

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“…Once a resistive zone appears, the current flow redistributes outwards from this zone, becoming asymmetric with respect to the conductor central axis. If the HTS conductor is a multi-strand cable (of Rutherford [14,32], Roebel [33,34], CORC ® [35,36], twisted stack [37] or other type), then the redistribution is generally also a function of inter-strand resistance, and a complex current flow pattern may form as a result. It should be noted that in the case of good current sharing (i.e., very low inter-strand resistance), current inhomogeneity is expected to be most apparent at a As magnet inductance L scales with the magnet size, τ e can be reduced either by increasing R mag (t) by some active means, such as the use of protection heaters [30] or induced coupling losses [31], or by increasing R dump .…”

Section: Magnetic Techniquesmentioning

confidence: 99%

Quench Detection and Protection for High-Temperature Superconductor Accelerator Magnets

Marchevsky

2021

Instruments

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High-temperature superconductors (HTS) are being increasingly used for magnet applications. One of the known challenges of practical conductors made with high-temperature superconductor materials is a slow normal zone propagation velocity resulting from a large superconducting temperature margin in combination with a higher heat capacity compared to conventional low-temperature superconductors (LTS). As a result, traditional voltage-based quench detection schemes may be ineffective for detecting normal zone formation in superconducting accelerator magnet windings. A developing hot spot may reach high temperatures and destroy the conductor before a practically measurable resistive voltage is detected. The present paper discusses various approaches to mitigating this problem, specifically focusing on recently developed non-voltage techniques for quench detection.

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Section: Magnetic Techniquesmentioning

confidence: 99%

Quench Detection and Protection for High-Temperature Superconductor Accelerator Magnets

Marchevsky

2021

Instruments

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“…The rectangular-structured cable configuration can yield a high J e at a small bending radius but only along the easy-way bend direction which can be a limitation for magnet design and fabrication. Table 1 shows a performance summary of various high J e tape stacks, cables/wires for accelerator applications developed so far along with their minimum bending radius [18][19][20][21][22][23]. The round wire configuration, on the other hand, is mechanically isotropic and makes use of the excellent tolerance of REBCO tapes to torsional strain that was demonstrated by spiral winding of narrow tapes to small twist pitch lengths [24].…”

Section: Introductionmentioning

confidence: 99%

Symmetric tape round REBCO wire withJ_e(4.2 K, 15 T) beyond 450 A mm⁻²at 15 mm bend radius: a viable candidate for future compact accelerator magnet applications

Kar

Luo

Yahia

et al. 2018

Supercond. Sci. Technol.

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Due to an error in the production process, the title of this article should read 'Symmetric Tape Round (STAR) REBCO wire with J e (4.2 K, 15 T) beyond 450 A mm −2 at 15 mm bend radius: a viable candidate for future compact accelerator magnet applications'. Furthermore, all references to 'symmetric tape round wires' should be 'Symmetric Tape Round (STAR) wires'.In the 'Tape preparation' subsection 'The REBCO tape was then slit from a width of 12-2.5 mm using a reel-to-reel laser slitting machineK' should read 'The REBCO tape was then slit from a width of 12 to 2.5 mm using a reel-to-reel laser slitting machineK'.

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“…The magnetic density can be examined by (4). Besides, the stress is caused by the Lorenz force generated by interaction between operating current and magnetic field from (5).…”

Section: B Mechanical Analysismentioning

confidence: 99%

“…conductor has the ability to both carry large currents and withstand high magnetic fields, which makes it a good choice for winding magnet coils in high fields [3]- [5]. Additionally, in order to increase storage energy and reduce electromagnetic pollution, the toroid-type SMES magnet is desirable for an MJ-class SMES system.…”

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confidence: 99%

Mechanical Properties of MJ-Class Toroidal Magnet Wound by Composite HTS Conductor

Qiu

Rao

Zhu

et al. 2017

IEEE Trans. Appl. Supercond.

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An MJ-class superconducting magnetic energy storage (SMES) system has a wide range of potential applications in electric power systems. The composite HTS conductor, which has the advantages of carrying large critical currents and withstanding high magnetic fields, is suitable for winding an MJclass magnet coil. However, the Lorentz force of an HTS wire is so large that its induced mechanical stresses should be examined to ensure that the magnet is in good condition. By means of the equivalent material properties method and the sequential coupling method, this paper studies the mechanical properties of a 3 MJ toroidal SMES magnet wound by a composite HTS conductor. Based on the electromagnetic-structural coupling analysis, the Von-Mises stress, the radial stress, and the hoop stress of a magnet coil are calculated and employed to validate the stability of the MJ-class toroidal SMES magnet.  Index Terms-SMES, composite HTS conductor, equivalent material properties, sequential coupling, mechanical analysis I. INTRODUCTION UPERCONDUCTING Magnetic Energy Storage (SMES) systems have the advantages of high power density and a fast response speed. They can be used to compensate voltage sags and mitigate power fluctuations in an electrical grid [1]. SMES technology can also be used to facilitate the gridconnection of renewable energy, increase the stability of a power grid and the quality of power supply [2]. In the near future, an MJ-class SMES system is expected to play an important role in power grids. An MJ-class SMES system carries large currents and creates a high field in operation. An SMES magnet is considered to be a key component of the SEMS system. If an SMES magnet were wound by a commercial superconductor, such as a YBCO tape with the cross-section of 4.4 mm×0.1 mm, whose critical current is limited to 100 A~300 A (@77 K, self-field), it would be very difficult to achieve large-capacity energy storage higher than the MJ-class considering the expensive cooling cost. Consequently, it would not provide a favorable condition for the applications of MJ-class SMES systems in power grids. Compared with a parallel stacked wire, a composite HTS

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Investigation of REBCO Twisted Stacked-Tape Cable Conductor Performance

Cited by 11 publications

References 7 publications

Quench Detection and Protection for High-Temperature Superconductor Accelerator Magnets

Quench Detection and Protection for High-Temperature Superconductor Accelerator Magnets

Symmetric tape round REBCO wire withJ_e(4.2 K, 15 T) beyond 450 A mm⁻²at 15 mm bend radius: a viable candidate for future compact accelerator magnet applications

Mechanical Properties of MJ-Class Toroidal Magnet Wound by Composite HTS Conductor

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Investigation of REBCO Twisted Stacked-Tape Cable Conductor Performance

Cited by 11 publications

References 7 publications

Quench Detection and Protection for High-Temperature Superconductor Accelerator Magnets

Quench Detection and Protection for High-Temperature Superconductor Accelerator Magnets

Symmetric tape round REBCO wire withJe(4.2 K, 15 T) beyond 450 A mm−2at 15 mm bend radius: a viable candidate for future compact accelerator magnet applications

Mechanical Properties of MJ-Class Toroidal Magnet Wound by Composite HTS Conductor

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Symmetric tape round REBCO wire withJ_e(4.2 K, 15 T) beyond 450 A mm⁻²at 15 mm bend radius: a viable candidate for future compact accelerator magnet applications