Magneto-Thermal Modeling of Second-Generation HTS for Resistive Fault Current Limiter Design Purposes

Roy, F.; Dutoit, B.; Grilli, Francesco; Sirois, Frédéric

doi:10.1109/tasc.2008.917576

Cited by 79 publications

(63 citation statements)

References 12 publications

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“…The critical current density is changed accordingly once the new temperature distribution is calculated. We assume a linear J c (T) in our analysis, [22], although more refined models can also be used [44]. The J c (T) law is given by;…”

Section: Temperature Distribution During Self-heatingmentioning

confidence: 99%

Self-heating of bulk high temperature superconductors of finite height subjected to a large alternating magnetic field

Laurent¹,

Fagnard²,

Babu³

et al. 2010

Supercond. Sci. Technol.

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Abstract. In this work we study, both experimentally and numerically, the self-heating of a bulk, large YBCO pellet of aspect ratio (thickness / diameter) ~ 0.4 subjected to a large AC magnetic field. To ensure accurate temperature measurements, the sample was placed in an experimental vacuum chamber to achieve a small and reproducible heat transfer coefficient between the superconductor and the cryogenic fluid. The temperature was measured at several locations on the sample surface during the self-heating process. The experimentally determined temperature gradients are found to be very small in this arrangement (< 0.2 K across the radius of the superconductor). The time-dependence of the average temperature T(t) is found to agree well with a theoretical prediction based on the one-dimensional (1-D) Bean model, assuming a uniform temperature in the sample. A 2-D magneto-thermal model was also used to determine the space and time-dependent temperature distribution T (r, z, t) during the application of the AC field. The losses in the bulk pellet were determined using an algorithm based on the numerical method of Brandt, which was combined with a heat diffusion algorithm implemented using a finite-difference method. The model is shown to be able to reproduce the main trends of the observed temperature evolution of the bulk sample during a self-heating process. Finally, the 2-D model is used to study the effect of a non-uniform distribution of critical current density J c (r, z) on the losses within the bulk superconductor.

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Section: Temperature Distribution During Self-heatingmentioning

confidence: 99%

Self-heating of bulk high temperature superconductors of finite height subjected to a large alternating magnetic field

Laurent¹,

Fagnard²,

Babu³

et al. 2010

Supercond. Sci. Technol.

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“…For the DYBCO and Ag layer, 300 nm (t Sc ) and 40 nm respectively. For our base case simulation, we intentionally omitted the buffer layer (assimilated to the substrate), we multiplied the thickness of the Ag and Dy-BCO layers by a factor 100 and adapted the related physical parameters with an aspect ratio approximation described in previous works [11].…”

Section: Numerical Model Physical Descriptionmentioning

confidence: 99%

“…Based on a previous magneto-thermal model [11,12], some assumptions have been used in order to save computation time and look at the physical parameters that actually determine the NZP.…”

mentioning

confidence: 99%

Quench propagation in coated conductors for fault current limiters

Roy

Perez

Therasse

et al. 2009

Physica C: Superconductivity

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A fundamental understanding of the quench phenomenon is crucial in the future design and operation of high temperature superconductors based fault current limiters.The key parameter that quantifies the quenching process in superconductors is the normal zone propagation (NZP) velocity, which is defined as the speed at which the normal zone expands into the superconducting volume. In the present paper, we used numerical models developed in our group recently to investigate the quench propagation in coated conductors. With our models, we have shown that the NZP in these tapes depends strongly on the substrate properties.(94 words) 1

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“…Four physical parameters have been scaled in the thicker geometry to approximate the real solution [12]. These parameters are C p , J c0 , k and E. Using lower AR geometries allows reducing the number of elements required to keep the convergence and accuracy of our model, i.e.…”

Section: Theoretical Modelmentioning

confidence: 99%

Magneto-thermal finite element modeling of 2nd generation HTS for FCL design purposes

Roy

Dutoit

Grilli

et al. 2008

J. Phys.: Conf. Ser.

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Abstract. Coated conductors are very promising for the design of novel and efficient Fault Current Limiter (FCL). However, before considering using them in a power grid, their thermal and electromagnetic behaviors in the presence of over-critical currents need to be investigated in details. In this context, we performed finite element magneto-thermal modeling of coated conductors under over-critical current on several geometries. Accordingly, we have investigated the substrate electrical connectivity and thermal properties on the HTS-FCL behavior. All simulations were performed using in COMSOL Multiphysics , a commercial finite element package, which has a built-in coupling between the thermal and electrical equations, allowing us to compute both quantities simultaneously during the solving process. Our simulations allowed us to formulate thresholds for the current density usable in coated HTS as well as limitation capability of a device made of these new conductors. IntroductionRecent advances in thin film technology and epitaxial growth allowed the emergence of coated conductors (CC) as a second generation of high-temperature superconductors (HTS), which, by their expected low price and high critical current density, seems to be the favored candidate for resistive Fault Current Limiters (FCLs) [1][2][3]. In the recent past, several authors have proposed numerical magneto-thermal models to describe the behavior of CC-FCL [4][5][6]. Such simulations are of great interest to design efficient limiters since they allow a better understanding of these devices, which are hard to design in a way that thermal stability is ensured over all conditions of operation. Nonetheless, numerical models proposed in the literature are usually not suitable for quick and simple calculations. Indeed, implementing home developed code or using typical finite element method (FEM) software is often time consuming and requires considerable resources. In this paper, we present a magneto-thermal model that is very easy to implement.

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Magneto-Thermal Modeling of Second-Generation HTS for Resistive Fault Current Limiter Design Purposes

Cited by 79 publications

References 12 publications

Self-heating of bulk high temperature superconductors of finite height subjected to a large alternating magnetic field

Self-heating of bulk high temperature superconductors of finite height subjected to a large alternating magnetic field

Quench propagation in coated conductors for fault current limiters

Magneto-thermal finite element modeling of 2nd generation HTS for FCL design purposes

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