Evaluation of the Normal-Zone Propagation Characteristics of REBCO Coated Conductors With Laminated Cu Tape

Daibo, M.; Fujita, Shin; Haraguchi, M.; Iijima, Y.; Saitoh, Takashi

doi:10.1109/tasc.2011.2105454

Cited by 16 publications

(7 citation statements)

References 9 publications

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“…Both the calculated and experimental results indicate that increasing the thickness of plated copper in a coated conductor causes a decrease in the propagation velocity. In previous study, it was reported that the increasing of heat capacity is the main reason for the decrease in NZPV when increasing copper thickness [6]. However, based on (1), as these two samples have nearly the same values of Tg, Tc, and T0, and there is not too much of difference in the heat capacity C between these two coated conductors, it is considered that the decrease in the overall current density J (by increasing the thickness of the copper stabilizer) is the main reason for this decrease in NZPV.…”

Section: A Normal Zone Propagation Velocitymentioning

confidence: 96%

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Quench Experiments of Conduction-Cooled Coated Conductors With Various Copper-Stabilizer Thicknesses

Luo

Inoue

Amemiya

2020

IEEE Trans. Appl. Supercond.

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We experimentally studied the quench properties of REBa2Cu3Oy (RE-123) coated conductors with various platedcopper thicknesses (20 and 40 m). A short sample of coated conductors was conduction-cooled to 45 K, a magnetic field (µ0H, up to 2 T) was applied perpendicular to its wide face to control the critical current, an operating current was supplied, and subsequently quench was initiated using a small heater. Normal zone propagation velocities (NZPVs) were measured at various operating currents, and the NZPVs of coated conductors with various copper thicknesses were compared with each other. To understand the impact of the copper stabilizer on quench protection, hot-spot temperatures were measured during the processes that simulate quench detection using voltage taps and protection using dump resistor. The maximum hot-spot temperatures were plotted against the operating current as well as the overall current density, and the impact of the thickness of the copper stabilizer on hot-spot temperature was examined. The impact of the initial temperature on hot-spot temperature was also studied.

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Section: A Normal Zone Propagation Velocitymentioning

confidence: 96%

“…Several studies have been conducted on the normal zone propagation velocity (NZPV), focusing on the copper stabilizer in coated conductors numerically [5] and experimentally (at 77 K) [6]. In this study, we particularly measured the NZPV of conduction-cooled coated conductors with platedcopper stabilizers of various thicknesses.…”

Section: Introductionmentioning

confidence: 99%

Quench Experiments of Conduction-Cooled Coated Conductors With Various Copper-Stabilizer Thicknesses

Luo

Inoue

Amemiya

2020

IEEE Trans. Appl. Supercond.

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“…In high-magnetic-field applications, it possesses more suitable characteristics than the low-temperature superconductor (LTS), such as a high current density, high stability margin, and low dependence of critical current (I c ) on an external magnetic field [3,4]. However, the 2G HTS has a very slow normal-zone propagation velocity because of the large specific heat capacity and multi-layer structure of its conductors [5][6][7]. For that reason, expecting a self-protection performance of LTS coils becomes more difficult to achieve than in case of 2G HTS coils.…”

Section: Introductionmentioning

confidence: 99%

Electrical and thermal analyses of a second generation high temperature superconducting magnet with vanadium III oxide and Kapton polyimide film insulation materials under an over-pulse current

Quach

Kim

Hyeon

et al. 2019

Supercond. Sci. Technol.

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In this study, we developed a novel simulation code to analyze a second-generation high-temperature superconductor (HTS) magnet that was insulated with a polyimide film and vanadium III oxide (V2O3). In particular, V2O3 is one of the metal–insulator transition materials that has resistivity that varies with temperature. For its commercialization for large-scale HTS magnet applications, the HTS magnet that uses V2O3 is expected to achieve both of the desired characteristics, specifically, (a) high electrical and thermal stabilities for the non-insulated coils, and (b) prompt controllability of the insulated coils. First, an equivalent electrical-circuit model is proposed to develop a simulation code for the analysis of electrical and thermal characteristics of polyimide and V2O3. Then, all simulated results were compared with experimental results of a small-scale HTS single pancake coil and discussed to verify the reliability of the developed simulation code.

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“…In previous experimental studies of the normal zone structure in HTS tapes, it was generated e.g. in vacuum by means of an external heater (Daibo et al, 2011 , Pelegrin et al, 2011 ) or by pulsed current (Mader et al, 2011 ). These conditions are different from those in the HTS power devices where normal zone is generated in liquid N 2 due to overcritical AC current.…”

Section: Introductionmentioning

confidence: 99%

Normal domain temperature profile in second generation HTS tape wire

et al. 2013

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BackgroundStudies of the normal zone in high-temperature superconducting wires are extremely important for power applications, such as fault current limiters, motors, cables etc. We studied the temperature distribution and normal domain propagation in high-temperature superconducting YBCO tape with highly resistive substrate.FindingsFor applied voltages exceeding a certain threshold value the normal domain was found to become unstable and started to propagate along the tape.ConclusionsThe normal domain in superconducting tape with highly resistive substrate appears when voltage is applied to the sample.At voltages greater than the threshold value, the domain starts to move.This motion enables us to find the domain temperature and potential profile.

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Evaluation of the Normal-Zone Propagation Characteristics of REBCO Coated Conductors With Laminated Cu Tape

Cited by 16 publications

References 9 publications

Quench Experiments of Conduction-Cooled Coated Conductors With Various Copper-Stabilizer Thicknesses

Quench Experiments of Conduction-Cooled Coated Conductors With Various Copper-Stabilizer Thicknesses

Electrical and thermal analyses of a second generation high temperature superconducting magnet with vanadium III oxide and Kapton polyimide film insulation materials under an over-pulse current

Normal domain temperature profile in second generation HTS tape wire

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