Enhancement of 2G HTS Coil Stability With V2O3 and Perforated HTS Wire

Kim, Hyungwook; Jo, Young-Sik; Kim, Seog-Whan; Ha, Dong-Woo; Ko, Rock-Kil; Kim, Doohun; Hur, Jin

doi:10.1109/tasc.2017.2778086

Cited by 14 publications

(10 citation statements)

References 5 publications

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“…It states the SFCLs boost transient stabilization. Paper [13] suggested a -non-inductive HTS wire coil‖ that was both resistive and inductive throughout the parallel manufacturing processes. Impedance properties are shown in the -short circuit‖ test performance.…”

Section: Literature Reviewmentioning

confidence: 99%

Modeling of Resistive Type Superconducting Fault Current Limiter

Bohidar¹,

Sharma²

2019

IJEAT

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In the coming smart grid, among the important issues related to the application of the “Superconducting Fault Current Limiters” (SFCL) is linked to its potential outcome on the decrease of abnormal fault Current. Because of the increased rate of failure currents, SFCL is most likely to enter a media and low-voltage network to reduce the electrical systems' ability and enhance the strength of the devices. All substations providing the distribution of electrical energy are prone to unnecessary voltage or current spikes, affecting facilities such as interruptions in energy supply, resulting in economic loss for the companies that operate them. Currently, no SFCL Simulink model is implemented in the MATLAB database software. A Matlab / Simulink design for the resistive SFCL is suggested in this research paper. This article first presents a resistive style SFCL model using Matlab / Simulink and then replicates distinct fault kinds and analyzes are performed without SFCL and SFCL. The research demonstrates that SFCL reduces the amount of the fault current to a satisfying stage but also reduces the thermal temporary restoration voltage. SFCL also increases the temporary strength, energy performance and efficiency of energy scheme by spontaneously decreasing error flow. The research paper introduces an advanced current limiter implementation based on superconductivity. The theme of the paper revolves around the design of “resistive-type superconducting fault current limiters”.

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Section: Literature Reviewmentioning

confidence: 99%

Modeling of Resistive Type Superconducting Fault Current Limiter

Bohidar¹,

Sharma²

2019

IJEAT

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“…where Q, k, A, ΔT, and Δr denote heat transfer in the spiral direction, thermal conductivity of the 2G HTS wire, cross section of the 2G HTS wire, temperature difference, and thickness of cylindrical wall, respectively. This study utilized the resistivity of V 2 O 3 as shown in the figure 5 which was formed by using the Origin software to transfer the figure of the resistivity of V 2 O 3 [19][20][21][22][23][24] to the equation for developing the simulation code.…”

Section: Fabrication Of Hts Spcsmentioning

confidence: 99%

“…Figures 14 and 15 respectively show the various resistance and current traces of SPC I and II over a period of 0.4 s for αI t firing. The changes in resistivity of V 2 O 3 and Kapton insulation materials as a function of temperature were referred from [19][20][21][22][23][24] and [25], respectively. In the SPC I case, we confirmed that the I r component was not generated inside the SPC (figure 14(b)) because the R i value of the Kapton layer remained in a high order after the firing at 1.9 I t .…”

Section: Current Bypass Simulationmentioning

confidence: 99%

“…The unique characteristic of vanadium III oxide (V 2 O 3 ) [19,20], which is one of the MIT materials, results in resistivity variability as a function of temperature. The resistivity is remarkably high at 77 K. However, it drops abruptly by 1/600 000 times at a temperature of approximately 150 K [21][22][23][24]. Thus, if quenching unexpectedly occurs in a weak layer of the HTS coil, the transport current (I t ) can easily bypass to healthy layers through V 2 O 3 contact surface between the conductors.…”

Section: Introductionmentioning

confidence: 99%

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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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“…Kim et al 28,29 directly painted V2O3 powders on HTS conductors and demonstrated the advantage of this self-switching resistance layer. Compared with a layer from powders, thin films made by physical vapor deposition (PVD) can be advantageous in terms of the adjustable resistance properties and industrial production.…”

Section: Introductionmentioning

confidence: 99%

Vanadium oxide coatings to self-regulate current sharing in high-temperature superconducting cables and magnets

Yang

Martínez

Muley

et al. 2020

Journal of Applied Physics

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High-temperature superconductors such as REBa2Cu3O7-δ (REBCO, RE = rare earth) enable high-current cables and high-field magnets. By removing the turn-to-turn insulation in a magnet application, recent experiments demonstrated that REBCO magnets can self-protect against catastrophic damage during a superconducting-tonormal transition (quench), i.e. when the stored magnetic energy rapidly converts to heat. The current can bypass the hot spot during a quench, thereby reducing the localized heat dissipation. The removal of the insulation between turns, however, leads to excessive eddy currents during current ramping, thereby forcing a muchprolonged magnet charging time. To address this issue, we investigate vanadium oxide (VOx) coatings as a temperature-dependent self-switching medium that automatically manages current sharing. VOx coatings (with 1.70 ≤ x ≤ to 2.07) were deposited by reactive cathodic arc deposition, initially on insulating glass to determine the electrical properties, and later on commercial REBCO tapes. The coatings are Xray amorphous but with short-range crystalline ordering according to Raman spectrometry. The resistivity of VOx decreased by at least three orders of magnitude when the temperature increased from 80 to 300 K. The coating process is compatible with commercial REBCO tapes as evidenced by the negligible change of the critical current caused by the coating process. The results from current sharing experiments and circuit analysis suggest that the VOx coating can effectively self-regulate current sharing in REBCO magnets, suppress excessive eddy currents and enable selfprotection during quenches.

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Enhancement of 2G HTS Coil Stability With V2O3 and Perforated HTS Wire

Cited by 14 publications

References 5 publications

Modeling of Resistive Type Superconducting Fault Current Limiter

Modeling of Resistive Type Superconducting Fault Current Limiter

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

Vanadium oxide coatings to self-regulate current sharing in high-temperature superconducting cables and magnets

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