Quench Protection of YBCO Coils: Co-Winding Detection Method and Limits to Hot-Spot Temperature

Ariyama, Takahiro; Takagi, Toshihisa; Nakayama, Daiki; Sasaki, Erika; Takao, T.; Tsukamoto, O.; Matsuoka, Taro

doi:10.1109/tasc.2016.2529838

Cited by 22 publications

(7 citation statements)

References 8 publications

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“…This sample was also damaged. As shown in Figure 7, the peak temperatures of the two damaged samples were both around 530 K. This observation is consistent with [40][41][42]. In other words, this threshold temperature determines the possibility of recovery.…”

Section: Discussionsupporting

confidence: 81%

Investigations on Quench Recovery Characteristics of High-Temperature Superconducting Coated Conductors for Superconducting Fault Current Limiters

et al. 2021

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Superconducting fault current limiters (SFCLs) are attracting increasing attention due to their potential for use in modern smart grids or micro grids. Thanks to the unique non-linear properties of high-temperature-superconducting (HTS) tapes, an SFCL is invisible to the grid with faster response compared to traditional fault current limiters. The quench recovery characteristic of an HTS tape is fundamental for the design of an SFCL. In this work, the quench recovery time of an HTS tape was measured for fault currents of different magnitudes and durations. A global heat transfer model was developed to describe the quench recovery characteristic and compared with experiments to validate its effectiveness. Based on the model, the influence of tape properties on the quench recovery time was discussed, and a safe margin for the impact energy was proposed.

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Section: Discussionsupporting

confidence: 81%

Investigations on Quench Recovery Characteristics of High-Temperature Superconducting Coated Conductors for Superconducting Fault Current Limiters

et al. 2021

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“…to improve the stability and mechanical properties [9]- [11]. The copper stabilizer layers cause additional eddy current loss when the REBCO coated conductors are exposed to ac magnetic fields.…”

mentioning

confidence: 99%

Shielding Effect of (RE)Ba₂Cu₃O_7-d-Coated Conductors on Eddy Current Loss of Adjacent Metal Layers Under AC Magnetic Fields With Various Orientations

Sun

Long

Sidorov

et al. 2021

IEEE Trans. Appl. Supercond.

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Ba 2 Cu 3 O 7-d (REBCO) coated conductors are becoming a preferred wire choice for many potential high temperature superconducting (HTS) applications, where additional metal layers are usually attached to the REBCO conductors to improve reliability and stability. In such cases, the eddy current loss in the metal layers is affected by the magnetic field shielding by adjacent REBCO coated conductors. Here we present the ac loss measurement and simulation results in three copper-superconductor stacks comprising a 10-mm-wide Fujikura-coated conductor with one, two, and four 0.1-mm-thick, 10-mm-wide copper strips, under various applied magnetic field angles (defined by the angle between the applied magnetic field and the wide face of the superconductor) from 15°to 90°at 77 K. The amplitude of the magnetic field is up to 100 mT. The shielding effect, which reduces the eddy current loss in the metal layers stacked with a superconductor layer, increases with decreasing field angles, due to the change of the effective penetration field at the different field angles. The eddy current loss in the copper strips in the copper-superconductor stacks under the magnetic fields with various orientations is dominated by the perpendicular magnetic field component.

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“…Under normal operation, the voltage across the resistive zone V s is monitored using the voltage difference V diff between the HTS and Cu-CW coils. The value of V s is approximated by that of V diff with good accuracy because the two coils are tightly magnetically coupled and the inductive voltage in the HTS coil is effectively cancelled by that in the Cu-CW coil [19]. In this study, a quench is defined as an event in which the resistive voltage V s across the resistive part in the coil wire exceeds the quench detection voltage V q .…”

Section: Quench Protection Methods Using a Cu Cowound Coilmentioning

confidence: 99%

“…Generally, a withstand voltage of over 1 kV requires a costly coil insulation system. The author's group previously showed that quench detection using a Cu co-wound (Cu-CW) coil can suppress the inductive voltage of the coil effectively with high sensitivity [13,19]. In this configuration, the Cu tape for the Cu coil and HTS tape for the HTS coil are wound together.…”

Section: Introductionmentioning

confidence: 99%

Quench protection system for an HTS coil that uses Cu tape co-wound with an HTS tape

Toriyama

Nomoto

Ichikawa

et al. 2019

Supercond. Sci. Technol.

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A quench protection system for a high-temperature superconducting (HTS) coil using Cu tape co-wound with an HTS tape was studied by numerical analysis using a thermal model of a coil winding pack. In normal operation, the voltage across the resistive zone Vs in the HTS coil was monitored by measuring the voltage difference between the HTS coil and the co-wound Cu coil. When Vs exceeded the quench detection voltage, the HTS coil was disconnected from the power supply and the energy stored in the HTS coil was dumped into a dump resistor. At the same time, the terminals of the co-wound coil were connected to another resistor, and some of the current in the HTS coil was quickly transferred to the co-wound Cu tape coil due to the tight magnetic coupling of both coils. This is expected to decrease the hot-spot temperature due to the quick decrease of HTS coil current and to protect the coil from damage caused by overheating at the hot-spot. The analysis investigated the effectiveness of this method.

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Quench Protection of YBCO Coils: Co-Winding Detection Method and Limits to Hot-Spot Temperature

Cited by 22 publications

References 8 publications

Investigations on Quench Recovery Characteristics of High-Temperature Superconducting Coated Conductors for Superconducting Fault Current Limiters

Investigations on Quench Recovery Characteristics of High-Temperature Superconducting Coated Conductors for Superconducting Fault Current Limiters

Shielding Effect of (RE)Ba₂Cu₃O_7-d-Coated Conductors on Eddy Current Loss of Adjacent Metal Layers Under AC Magnetic Fields With Various Orientations

Quench protection system for an HTS coil that uses Cu tape co-wound with an HTS tape

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Quench Protection of YBCO Coils: Co-Winding Detection Method and Limits to Hot-Spot Temperature

Cited by 22 publications

References 8 publications

Investigations on Quench Recovery Characteristics of High-Temperature Superconducting Coated Conductors for Superconducting Fault Current Limiters

Investigations on Quench Recovery Characteristics of High-Temperature Superconducting Coated Conductors for Superconducting Fault Current Limiters

Shielding Effect of (RE)Ba2Cu3O7-d-Coated Conductors on Eddy Current Loss of Adjacent Metal Layers Under AC Magnetic Fields With Various Orientations

Quench protection system for an HTS coil that uses Cu tape co-wound with an HTS tape

Contact Info

Product

Resources

About

Shielding Effect of (RE)Ba₂Cu₃O_7-d-Coated Conductors on Eddy Current Loss of Adjacent Metal Layers Under AC Magnetic Fields With Various Orientations