Alternating current loss in rectangular superconducting bars with a constant critical-current density

Pardo, Enric; Chen, D. X.; Sanchez, Alvaro; Navau, Carles

doi:10.1088/0953-2048/17/1/014

Cited by 28 publications

(25 citation statements)

References 25 publications

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“…for the single Roebel cable, where Q is the loss per cycle and cable length, shows that for low current amplitudes it is proportional I m (or Q I m 4 µ ), figure 8. This kind of dependence, typical for thin strips, appears always when the dominant ac loss contribution is from the flux penetration from the narrow edges of the tapes [35]. With increasing the current amplitude, the behaviour of the Roebel cable approaches to a mono-block, with a loss per cycle proportional to I m 3 .…”

Section: Stand-alone Roebel-cable Solenoid: Modellingmentioning

confidence: 92%

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Ac loss modelling and measurement of superconducting transformers with coated-conductor Roebel-cable in low-voltage winding

Pardo

Staines

Jiang

et al. 2015

Supercond. Sci. Technol.

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Power transformers using high temperature superconductor (HTS) Re-BCO coated conductor and liquid nitrogen (LN) dielectric have many potential advantages over conventional transformers. The AC loss in the windings complicates the cryogenics and reduces the efficiency, and hence it needs to be predicted in its design, usually by numerical calculations. This article presents detailed modelling of superconducting transformers with Roebel cable in the low-voltage (LV) winding and a high-voltage (HV) winding with more than 1000 turns. First, we model a 1 MVA 11 kV/415 V 3-phase transformer. The Roebel cable solenoid forming the LV winding is also analyzed as stand-alone coil. Agreement between calculations and experiments of the 1 MVA transformer supports the model validity for a larger tentative 40 MVA 110 kV/11 kV 3-phase transformer design. We found that the AC loss in each winding is much lower when it is inserted in the transformer than as stand-alone coil. The AC loss in the 1 MVA and 40 MVA transformers is dominated by the LV and HV windings, respectively. Finally, the ratio of total loss over rated power of the 40 MVA transformer is reduced below 40 % of that of the 1 MVA transformer. In conclusion, the modelling tool in this work can reliably predict the AC loss in real power applications.

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Section: Stand-alone Roebel-cable Solenoid: Modellingmentioning

confidence: 92%

“…from the narrow edges of the tapes [35]. With increasing the current amplitude, the behaviour of the Roebel cable approaches to a mono-block, with a loss per cycle proportional to I 3 m .…”

Section: Hv LVmentioning

confidence: 98%

Ac loss modelling and measurement of superconducting transformers with coated-conductor Roebel-cable in low-voltage winding

Pardo

Staines

Jiang

et al. 2015

Supercond. Sci. Technol.

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“…1 for properties) with the numerical results obtained with FEMPAR. The problem of a HTS tape magnetized by a current flowing through it has been solved by several authors (see, e.g., [55,56,57]). Besides, several comparisons between experimental and numerical results can be found, e.g., in [58,59,60].…”

Section: 3mentioning

confidence: 99%

Simulation of High Temperature Superconductors and experimental validation

Olm

Badia

Martı́n

2019

Computer Physics Communications

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In this work, we present a parallel, fully-distributed finite element numerical framework to simulate the low-frequency electromagnetic response of superconducting devices, which allows to efficiently exploit HPC platforms. We select the so-called H-formulation, which uses the magnetic field as a state variable. Nédélec elements (of arbitrary order) are required for an accurate approximation of the H-formulation for modelling electromagnetic fields along interfaces between regions with high contrast medium properties. An h-adaptive mesh refinement technique customized for Nédélec elements leads to a structured fine mesh in areas of interest whereas a smart coarsening is obtained in other regions. The composition of a tailored, robust, parallel nonlinear solver completes the exposition of the developed tools to tackle the problem. First, a comparison against experimental data is performed to show the availability of the finite element approximation to model the physical phenomena. Then, a selected state-of-the-art 3D benchmark is reproduced, focusing on the parallel performance of the algorithms.

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“…When the aspect ratio is changing, the slope of the first cosine components is varying [2]. Interestingly, in the three cases compared here, the higher sine components are practically identical.…”

Section: Fig 1 Experimental Setupmentioning

confidence: 67%

“…This can be performed only with the help of numerical methods. In our case, the minimization of magnetic energy variation was used [2], which is equivalent to the critical state model [3]. Indeed, we have found that the numerical results lie in the area limited by two analytical models mentioned above, when studying the Q(F ) dependence, where F is the ratio of AC current amplitude, I a , with respect to the wire's critical current, I c .…”

Section: Introductionmentioning

confidence: 99%

Study of AC Transport in Superconducting Wire with the Help of Pick-up Coils

Klinčok¹,

Gömöry²

2004

Czech J Phys

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The simulation of voltages induced in pick-up coils of different shapes and positions, placed in the vicinity of a superconducting wire transporting AC current has been carried out. For the electrical current distribution, analytical expressions are used when wires with elliptic cross-section or of infinitely small thickness are considered. The case of a rectangular strip of finite thickness is solved numerically. In all these cases, distribution of magnetic field outside the wire is resolved, and from its change in time the signals induced in different pick-up coils are calculated. We present also Fourier coefficients of the fundamental and higher harmonics and discuss the differences between various wire shapes. : 74.25.Sv,74.25.Op,74.25.Qt PACS

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Alternating current loss in rectangular superconducting bars with a constant critical-current density

Cited by 28 publications

References 25 publications

Ac loss modelling and measurement of superconducting transformers with coated-conductor Roebel-cable in low-voltage winding

Ac loss modelling and measurement of superconducting transformers with coated-conductor Roebel-cable in low-voltage winding

Simulation of High Temperature Superconductors and experimental validation

Study of AC Transport in Superconducting Wire with the Help of Pick-up Coils

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