3D modeling and simulation of 2G HTS stacks and coils

Zermeño, V.; Grilli, Francesco

doi:10.1088/0953-2048/27/4/044025

Cited by 134 publications

(113 citation statements)

References 18 publications

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“…The use of homogenized stacks is an alternative to overcome the aforementioned challenges [19,20]. It consists in replacing the stack by a bulk superconductor with homogenized properties, as can be seen in figure 4.…”

Section: Homogenized Hts Stacksmentioning

confidence: 99%

H-formulation for simulating levitation forces acting on HTS bulks and stacks of 2G coated conductors

Sass¹,

Sotelo²,

Andrade³

et al. 2015

Supercond. Sci. Technol.

126

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Several techniques to model high temperature superconductors (HTSs) are used throughout the world. At the same time, the use of superconductors in transportation and magnetic bearings promises an increase in energy efficiency. However, the most widespread simulation technique in the literature, the H-formulation, has not yet been used to simulate superconducting levitation. The goal of this work is to present solutions for the challenges concerning the use of the H-formulation to predict the behavior of superconducting levitators built either with YBCO bulks or stacks of 2G wires. It is worth mentioning the originality of replacing bulks with HTS stacks in this application. In our simulation methodology, the movement between the HTS and the permanent magnet was avoided by restricting the simulation domain to the HTS itself, which can be done by applying appropriate boundary conditions and analytical expressions for the source field. Commercial finite element software was used for the sake of ease of implementation. Simulation results were compared with experimental data, showing good agreement. We conclude that the H-formulation is suitable for problems involving moving objects and is a good alternative to other approaches for simulating superconducting magnetic bearings.

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Section: Homogenized Hts Stacksmentioning

confidence: 99%

H-formulation for simulating levitation forces acting on HTS bulks and stacks of 2G coated conductors

Sass¹,

Sotelo²,

Andrade³

et al. 2015

Supercond. Sci. Technol.

126

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“…Temperature and magnetic flux density dependence of the critical current density JC was expressed by (3) [9,10], where T is the temperature and B is the component of magnetic flux density parallel to the surface of REBCO tape. The perpendicular magnetic field component is negligible because of the bifilar winding (figure 2).…”

Section: Numerical Analysis Methodsmentioning

confidence: 99%

Three-Dimensional Thermal Analysis of an SFCL REBCO Coil Immersed in Liquid Nitrogen

Qian

Shiratani

Terao

et al. 2018

J. Phys.: Conf. Ser.

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Abstract.A resistive type superconducting fault current limiter (SFCL) using REBCO tapes has shown its advantages in power applications. However, the hotspot problem, which can be caused by the uniformity of critical current density JC over long-length of REBCO tapes, is still a threat to the SFCL safety. In this paper, we have studied the limiting performance and transient temperature rise distribution of a nonintersecting type non-inductive solenoidal SFCL REBCO coil using three-dimensional electromagnetic and thermal coupled FEM analysis. Firstly, we modelled a local degradation of JC and studied its influence on the transient temperature rise distribution during the over current. The results indicated that a narrow and severe JC degradation leads to the concentration of current and heat generation in the normal JC area, which is opposite to the case of a relatively wider and slighter JC degradation area. Furthermore, REBCO tapes with different thickness of substrate and Ag over-layer were analysed to study the influence on limiting performance and temperature rise. A thicker substrate leaded to a slower temperature rise because of its higher heat capacity, and the Ag over-layer of 4 μm showed better limiting performance and thermal stability because of its better thermal conductivity as well as uniform temperature rise and SN transition. IntroductionA resistive type superconducting fault current limiter (SFCL) using REBCO tapes has shown its advantages in limiting fault currents and improving the reliability of a power system for its compactness and rapid increase in resistance [1]- [4]. However, critical current density (JC) uniformity over longlength of REBCO tapes may lead to a local overheating and burning of the tapes, which are called as the hotspot phenomenon. In the previous research, two types of non-inductance solenoidal coils for resistive type SFCL were studied on their current limiting properties and recovery characteristics [5]. In addition, the electrical and thermal behaviours of several types of REBCO tapes during the fault current limitation were analysed and evaluated with a simulation model, consequently, tapes with no stabilizer were considered more suitable for constructing SFCLs [6]. In reference [7], a 2D JC distribution map of such REBCO tape with no stabilizer was measured using the scanning hall probe microscopy (SHPM).In this paper, we have studied the thermal characteristics of an REBCO coil for SFCL use during the fault current limitation with the electromagnetic and thermal coupled FEM analysis. The nonintersecting type non-inductive solenoidal winding [5] consisting of the stabilizer free REBCO tape was assumed for the REBCO coil, which concept is shown in figure 1. This coil consists of an inner and an outer winding that are wounded bifilarly and connected in series to reduce the inductance of the coil. A local

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“…Therefore, an approximate 2D axisymmetric model is built for the joint-free coil. The model is based on H-formulation of HTS, whose governing equation is as: [31][32][33][34][35][36][37][38] …”

Section: B Numerical Modelmentioning

confidence: 99%

“…The model is solved by a commercial FEM software Comsol Multiphysics TM . 31,35 The magnetization process in the above field cooling test is simulated by this model, the results is shown in Fig. 2 …”

Section: B Numerical Modelmentioning

confidence: 99%

Magnetization of the joint-free high temperature superconductor (RE)Ba2Cu3Ox coil by field cooling

Zheng

Wang

et al. 2017

AIP Advances

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Joint-free (RE)Ba2Cu3Ox (REBCO) coil based on ‘wind-and-flip’ technique has been developed to generate a persistent magnetic field without power supply. This paper is to study the magnetization characteristics of the joint-free REBCO coil by field cooling, in order to trap higher field. A joint-free pancake coil is wound by REBCO tapes and the field cooling magnetization test is performed on it. An approximate numerical model based on H-formulation is built for this coil to analyze its magnetization behavior, which is validated by the experimental results Analysis show that a persistent direct current is induced in the coil during the field cooling operation, which generates the trapped field. The induced current of the joint-free coil shows an intrinsic non-uniform distribution among turns. Increasing the magnetization field and critical current of REBCO conductors can considerably increase the trapped field. But the trapping factor (the rate of trapped field to background magnetization field) reaches a maximum value (60 % for the test coil). This maximum value is an intrinsic characteristics for a fabricated coil, which only depends on the coil’s geometry structure. With a same usage of REBCO tapes, the trapping factor can be improved significantly by optimizing the coil structure to multiple pancakes, and it can approach 100 %.

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3D modeling and simulation of 2G HTS stacks and coils

Cited by 134 publications

References 18 publications

H-formulation for simulating levitation forces acting on HTS bulks and stacks of 2G coated conductors

H-formulation for simulating levitation forces acting on HTS bulks and stacks of 2G coated conductors

Three-Dimensional Thermal Analysis of an SFCL REBCO Coil Immersed in Liquid Nitrogen

Magnetization of the joint-free high temperature superconductor (RE)Ba2Cu3Ox coil by field cooling

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