Comparison Between the Behavior of HTS Thin Film Grown on Sapphire and Coated Conductors for Fault Current Limiter Applications

Antognazza, L.; Therasse, Mathieu; Decroux, M.; Roy, F.; Dutoit, B.; Abplanalp, M.; Fischer, Ø.

doi:10.1109/tasc.2009.2018113

Cited by 18 publications

(19 citation statements)

References 14 publications

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“…In the case of hastelloy, this thickness is less important than for sapphire since thermal diffusivity in hastelloy is a small fraction of the sapphire diffusivity. This confirms assumptions made by Antognazza et al [9] concerning the parameters choice (reduced thickness) for an analytic 1D approximation of the NZPV [13].…”

Section: Effect Of the Substrate Thicknesssupporting

confidence: 89%

“…As shown in 1-a, (sapphire), heat spread much more easily along the wire (heating up DyBCO) than for the tape made of hastelloy (2-a), where heat is generated more locally. As expected from experiments realized at the University of Geneva [9], heat generated in the sapphire case remains low until a fast transition occurs. Once the heat generated reaches a threshold value, the low heat capacity of sapphire increase the temperature of the tape almost instantaneously to the critical value and to the maximum power generation (t Sc ρ Sc J 2 =3.9 kW/cm 2 ).…”

Section: Effect Of the Substrate Thermal Parameterssupporting

confidence: 64%

“…other recent experiments demonstrate that the normal zone propagation (NZP) in CC are strongly dependent on substrate thermal properties [8,9]. In this work, we present numerical simulations regarding substrate effect on the NZP.…”

Section: Introductionmentioning

confidence: 95%

“…In an attempt to understand by simulation the results obtained by Antognazza et al [9], we compared the effect of two different substrate, i.e. sapphire and hastelloy on their switching behavior.…”

Section: Effect Of the Substrate Thermal Parametersmentioning

confidence: 99%

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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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Section: Effect Of the Substrate Thicknesssupporting

confidence: 89%

Section: Effect Of the Substrate Thermal Parameterssupporting

confidence: 64%

Section: Introductionmentioning

confidence: 95%

Section: Effect Of the Substrate Thermal Parametersmentioning

confidence: 99%

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Quench propagation in coated conductors for fault current limiters

Roy

Perez

Therasse

et al. 2009

Physica C: Superconductivity

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“…This higher local electric field can damage the CCs due to their poor thermal characteristics. Since the propagation velocities in CCs are very low (few cm/s [5]), one can not rely on this mechanism to decrease this local electric field. Usually to decrease it, the thickness of the by-pass is increased.…”

Section: Introductionmentioning

confidence: 99%

Heat Propagation Velocities in Coated Conductors for Fault Current Limiter Applications

Antognazza

Decroux

Therasse

et al. 2011

IEEE Trans. Appl. Supercond.

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The development of superconducting fault current limiters (SFCL) are mainly based on coated conductors (CC) in spite of the low electric fields the CC can sustain due to their poor thermal behavior and the very low propagation velocities of the normal zone. Nowadays the SFCL demonstrators are made of coil but another way of building them is to use plates with a meandered line. Its main advantage is the increase of the propagation velocities of the normal zone thanks to the longitudinal and lateral diffusion of the heat. Indeed in a meander the heat generated by a local dissipative zone diffuses also laterally and switches the adjacent lines, increasing the apparent propagation velocity of the normal zone. There is also a possibility to increase the lateral propagation velocity of the heat by adding onto the Hastelloy substrate a thermal link (an Ag film for instance) between the lines without an electrical short circuit. These test structures were developed on CC allowing the simultaneous measurement of the propagation of a heat front in the substrate and in the Hastelloy/Ag bilayer. They are made of a heater line and several parallel superconducting strips where the propagation of the T c temperature front is recorded. We will discuss the benefit of this approach as compared to the standard coil geometry.

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Self-field quench behaviour of YBa₂Cu₃O_7−δcoated conductors with different stabilizers

Wang

Trociewitz

Schwartz

2009

Supercond. Sci. Technol.

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Self-field quench behaviours of YBa 2 Cu 3 O 7−δ coated conductors with different stabilizers are studied. Samples include one with Cu on both sides (Cu-Cu), one with stainless steel on both sides (SS-SS), and one with Cu on one side and stainless steel on the other (Cu-SS). The measurements of the minimum quench energy (MQE) and normal zone propagation velocity (NZPV) are taken at various temperatures (30-75 K), and transport currents (30% I c to 90% I c ) at a typical pressure of 10 −5 Pa. Of the three samples, the Cu-Cu sample has the highest MQE while the SS-SS one has the lowest MQE at the same temperature and percentage of I c ; the NZPV in the SS-SS sample is found to be the highest while those of the Cu-Cu and Cu-SS samples are similar. The normal zone voltage and the hot-spot temperature are also compared. Both the classic adiabatic quench propagation model and the interface resistance model are used to explain the NZPV and MQE differences between the samples. The implications for conductor design and quench detection and protection are discussed.pared. The experimental approach, including sample description, measurement setup, protocol and data preparation, is presented first. The results of minimum quench energy (MQE) and normal zone propagation velocity (NZPV) of each sample follow. The ratio of the normal zone voltage and the peak temperature, a key parameter for detection and protection, is compared. Implications for conductor design and quench detection and protection are discussed.

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Comparison Between the Behavior of HTS Thin Film Grown on Sapphire and Coated Conductors for Fault Current Limiter Applications

Cited by 18 publications

References 14 publications

Quench propagation in coated conductors for fault current limiters

Quench propagation in coated conductors for fault current limiters

Heat Propagation Velocities in Coated Conductors for Fault Current Limiter Applications

Self-field quench behaviour of YBa₂Cu₃O_7−δcoated conductors with different stabilizers

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Comparison Between the Behavior of HTS Thin Film Grown on Sapphire and Coated Conductors for Fault Current Limiter Applications

Cited by 18 publications

References 14 publications

Quench propagation in coated conductors for fault current limiters

Quench propagation in coated conductors for fault current limiters

Heat Propagation Velocities in Coated Conductors for Fault Current Limiter Applications

Self-field quench behaviour of YBa2Cu3O7−δcoated conductors with different stabilizers

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Product

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Self-field quench behaviour of YBa₂Cu₃O_7−δcoated conductors with different stabilizers