The effects of superconductor–stabilizer interfacial resistance on the quench of a current-carrying coated conductor

Levin, Gilbert V.; Novak, Kyle A.; Barnes, Paul N.

doi:10.1088/0953-2048/23/1/014021

Cited by 34 publications

(66 citation statements)

References 24 publications

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“…For the defined phenomenological parameters, the numerical models always gives steeper resistive transitions than the one observed experimentally. For this work, the temperature dependence of the empirical-laws-exponent as well as the effect of the interface resistance [8] and of the electrical contact with the substrate may change the electrical behaviors of the simulated tapes [9]. From the obtained results, it seems that the applicability of the temperature-dependent phenomenological laws are questionable and also that further research on the materials properties, such as the one initiated by Sirois et al [10], have to be done to simulate accurately the behavior of coated conductors during quenches.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of the Applicability of Phenomenological HTS Models for Numerical Analysis of Quenches in Coated Conductors: Simulations vs. Experiments

Roy

Dutoit

Sirois

2011

IEEE Trans. Appl. Supercond.

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The electrical resistivity of coated conductors is strongly related to the inter-dependent set of parameters (J, H, T), respectively current density, magnetic field and temperature. On the one hand, it is difficult to isolate the contribution of each of these parameters on the resistivity measured experimentally. On the other hand, numerical methods, which may allow this separation, require a good knowledge of the fundamental laws governing the superconducting transition which are, up to now, derived from curve fitting with experimental data. In this paper, we investigate the influence of phenomenological formulas on the outputs of a recently developed finite element model. The outputs are compared against experimental voltage curves, which have been obtained under pulsed transport currents between 80 and 160 A and external magnetic fluxes of 0 to 350 mT. The comparisons indicate that the numerical models may reproduce well the measurements, using the right set of phenomenological laws parameters. Nevertheless, the solution may still be inaccurate at low field values and high current amplitudes, where the curvature of the simulated E-J curves is more pronounced, indicating that further refinement is required in order to obtain models valid over a wider range of parameters.Index Terms-Fault current limiters, finite element methods, high-temperature superconductors.

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Section: Discussionmentioning

confidence: 99%

Evaluation of the Applicability of Phenomenological HTS Models for Numerical Analysis of Quenches in Coated Conductors: Simulations vs. Experiments

Roy

Dutoit

Sirois

2011

IEEE Trans. Appl. Supercond.

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“…The origin of the increased longitudinal speed of NZP (along the conductor) was explained in [7]. The current exchange length λ, Eq.…”

Section: B Insulation With High Heat Conductancementioning

confidence: 99%

“…The main apparent shortcoming of the suggested approach to improving the quench protection quality of coated conductors is that by increasing the contact resistance we artificially reduce the stability margins of the device with respect to quench [7]. On the surface, the high stability of coated conductors is a plus.…”

Section: B Insulation With High Heat Conductancementioning

confidence: 99%

The effects of superconductor–stabilizer interfacial resistance on quenching of a pancake coil made out of coated conductor

Levin¹,

Jones²,

Novak³

et al. 2011

Supercond. Sci. Technol.

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We present the results of numerical analysis of normal zone propagation in a stack of Y Ba2Cu3O7−x coated conductors which imitates a pancake coil. Our main purpose is to determine whether the quench protection quality of such coils can be substantially improved by increased contact resistance between the superconducting film and the stabilizer. We show that with increased contact resistance the speed of normal zone propagation increases, the detection of a normal zone inside the coil becomes possible earlier, when the peak temperature inside the normal zone is lower, and stability margins shrink. Thus, increasing contact resistance may become a viable option for improving the prospects of coated conductors for high Tc magnets applications.

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“…Consequently, the power peak densities within the HTS-CCs are sensibly reduced without changing the thickness of the stabilizer layer. In the last years, the enhancement of the NZPV has been extensively studied [3]- [7] and several valid methods have been proposed. Even though, the proposed methods are profoundly different, the common conclusion is that the enhancement of NZPV will represent an important breakthrough for superconducting devices, and in particular for the design of RFCLs.…”

Section: Introductionmentioning

confidence: 99%

Impact of the Normal Zone Propagation Velocity of High-Temperature Superconducting Coated Conductors on Resistive Fault Current Limiters

Colangelo

Dutoit

2015

IEEE Trans. Appl. Supercond.

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Abstract-The engineering critical current (Ic) of the high temperature superconducting coated conductors (HTS-CCs), today available on the market, is not a uniform parameter and varies significantly along the length of the conductors. Moreover, commercial HTS-CCs have a low normal zone propagation velocity (NZPV). This property, together with the Ic inhomogeneity, exposes the HTS-CCs to local thermal instabilities. A crucial challenge for the design of resistive fault current limiters (RFCLs) based on HTS-CCs is to avoid the thermal runaway of the conductors, and in this respect the enhancement of the NZPV is a promising solution. In the recent years, several methods have been proposed and many and various techniques are now available to enhance the NZPV. Whichever will be the best technical solution to improve NZPV of HTS-CCs, our aim is to quantify the impact the enhancement of NZPV will have on the design of RFCLs based on HTS-CCs. For this reason, we used numerical models to analyze the effects of the enhancement of NZPV on the limitation performance of a RFCL integrated in a medium voltage (MV) power grid. In this manuscript, we quantify the benefits the enhancement of the NZPV will have on the next generation of HTS-CC-based RFCLs for MV grids.

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The effects of superconductor–stabilizer interfacial resistance on the quench of a current-carrying coated conductor

Cited by 34 publications

References 24 publications

Evaluation of the Applicability of Phenomenological HTS Models for Numerical Analysis of Quenches in Coated Conductors: Simulations vs. Experiments

Evaluation of the Applicability of Phenomenological HTS Models for Numerical Analysis of Quenches in Coated Conductors: Simulations vs. Experiments

The effects of superconductor–stabilizer interfacial resistance on quenching of a pancake coil made out of coated conductor

Impact of the Normal Zone Propagation Velocity of High-Temperature Superconducting Coated Conductors on Resistive Fault Current Limiters

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