Modeling a multistrand SC cable with an electrical DC lumped network

Bellina, F.; Boso, Daniela P.; Schrefler, B. A.; Zavarise, Giorgio

doi:10.1109/tasc.2002.1018666

Cited by 23 publications

(14 citation statements)

References 2 publications

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“…Some attempt at validating models similar to that described here have been reported in the literature [15] with encouraging results. Here we focus mainly on inductances, and we validate our calculations comparing them to the results of an independent model that uses analytical strand trajectories to solve the 6-D integral of Eq.…”

Section: Model Validationmentioning

confidence: 62%

“…Starting from a discretized cable geometry it is possible to use the distance between strands to identify the interstrand contacts [13,14,15]. An interstrand contact between strands i and j is defined as the point where the distance d ij between the centers of the strands is smaller than the sum of the strand radii.…”

Section: Strand Contact Pattern and Interstrand Conductancementioning

confidence: 99%

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Analysis of electrical coupling parameters in superconducting cables

Bottura

Breschi

Rosso³

2003

Cryogenics

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The analysis of current distribution and redistribution in superconducting cables requires the knowledge of the electric coupling among strands, and in particular the interstrand resistance and inductance values. In practice both parameters can have wide variations in cables commonly used such as Rutherford cables for accelerators or Cable-in-Conduits for fusion and SMES magnets. In this paper we describe a model of a multi-stage twisted cable with arbitrary geometry that can be used to study the range of interstrand resistances and inductances that is associated with variations of geometry. These variations can be due to cabling or compaction effects. To describe the variations from the nominal geometry we have adopted a cable model that resembles to the physical process of cabling and compaction. The inductance calculation part of the model is validated by comparison to semi-analytical results, showing excellent accuracy and execution speed. AbstractThe analysis of current distribution and redistribution in superconducting cables requires the knowledge of the electric coupling among strands, and in particular the interstrand resistance and inductance values. In practice both parameters can have wide variations in cables commonly used such as Rutherford cables for accelerators or Cable-in-Conduits for fusion and SMES magnets. In this paper we describe a model of a multi-stage twisted cable with arbitrary geometry that can be used to study the range of interstrand resistances and inductances that is associated with variations of geometry. These variations can be due to cabling or compaction effects. To describe the variations from the nominal geometry we have adopted a cable model that resembles to the physical process of cabling and compaction. The inductance calculation part of the model is validated by comparison to semi-analytical results, showing excellent accuracy and execution speed.

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Section: Model Validationmentioning

confidence: 62%

Section: Strand Contact Pattern and Interstrand Conductancementioning

confidence: 99%

Analysis of electrical coupling parameters in superconducting cables

Bottura

Breschi

Rosso³

2003

Cryogenics

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“…These parameters are automatically computed as a function of the cable curvilinear coordinate starting from the strands geometry and the contact electrical properties, described by the spot R s (X) and the distributed contact resistances R d (X m) [20], which can be individually assigned to the cable strands.…”

Section: Inter-strand Electrical Contact Resistancesmentioning

confidence: 99%

Analysis of the quench propagation along Nb3Sn Rutherford cables with the THELMA code. Part I: Geometric and thermal models

Manfreda

Bellina

2016

Cryogenics

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a b s t r a c tThe paper describes the new lumped thermal model recently implemented in THELMA code for the coupled electromagnetic-thermal analysis of superconducting cables. A new geometrical model is also presented, which describes the Rutherford cables used for the accelerator magnets. A first validation of these models has been given by the analysis of the quench longitudinal propagation velocity in the Nb 3 Sn prototype coil SMC3, built and tested in the frame of the EUCARD project for the development of high field magnets for LHC machine. This paper shows in detail the models, while their application to the quench propagation analysis is presented in a companion paper.

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“…Superposing these circulation currents and transport ones, NUCD appears. The leakage inductance along the pair of strands is around , thus Manuscript In spite of this fact, conventional NUCD simulations are performed with ideal or deformed circuit models obeying some rule [5]- [7]. Here, the ideal model consists of the superposition of sinusoidally waving strands.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analyses of Non-Uniform Current Distribution Within the Multi-Strand Superconducting Cable for Fusion Apparatus

Seo

Takahata

Mito

et al. 2004

IEEE Trans. Appl. Supercond.

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Multi-strand superconducting cables, e.g., cable in conduit conductors (CICCs), are applied to large-scale apparatus, such as fusion machines. In this sort of cable, strands carry different currents. This phenomenon is known as nonuniform current distribution (NUCD). NUCD causes increase of AC loss and/or instability of the cable. During the energization, induced voltage occurs along each strand and the minute difference between induced voltages results in the circulation current through the closed circuit composed of two different strands. Superposing these circulation currents and transport one, NUCD appears. The leakage inductance along the pair of strands is around 10 7 H m, thus the minute difference between induced voltages can produce large circulation currents. In spite of this fact, conventional NUCD simulations are fulfilled with ideal circuit models. Here, the ideal model consists of superposition of sinusoidally waving tracks of the strands. We made a numerical electric circuit model based on real tracks of strands simulating actual multi-strand cable. We considered mechanical interactions between the strands and proposed the solution about the strands' positions based on the mechanical energy minimum principle. Establishing suitable circuit model, we successfully calculated NUCD. Finally, NUCD due to the deformation of the cable's cross section was discussed. The deformation is caused by the electromagnetic force or cross sectional forming into rectangular shape.Index Terms-Induced voltage, multi-strand superconducting cable, nonuniform current distribution.

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Modeling a multistrand SC cable with an electrical DC lumped network

Cited by 23 publications

References 2 publications

Analysis of electrical coupling parameters in superconducting cables

Analysis of electrical coupling parameters in superconducting cables

Analysis of the quench propagation along Nb3Sn Rutherford cables with the THELMA code. Part I: Geometric and thermal models

Numerical Analyses of Non-Uniform Current Distribution Within the Multi-Strand Superconducting Cable for Fusion Apparatus

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