Study on Heat Transfer Characteristics HTS Tapes of Epoxy-Impregnated Conduction-Cooled Coils Using Winding Pack Model

Ariyama, Takahiro; Matsusda, N.; Matsuo, Ryuta; Fuchida, Yoshiki; Kojima, Akane; Takao, T.; Tsukamoto, O.; Yamaguchi, Takahiro; Kato, Takeshi

doi:10.1109/tasc.2016.2646324

Cited by 6 publications

(2 citation statements)

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“…Directly measured data for h l and h b for a YBCO wire winding pack do not exist. Therefore, the values of h l and h b were estimated based on the experimental values for a winding pack of Bi/Ag-sheathed wires [24]. The value of h l was assumed to be half of the value of the heat transfer between the wire layers of the Bi/Ag-sheathed wire winding pack because Cu-CW coil tapes are inserted and the heat transfer between the layers is dominated by the surface thermal resistance [24].…”

Section: Analytical Modelmentioning

confidence: 99%

“…Therefore, the values of h l and h b were estimated based on the experimental values for a winding pack of Bi/Ag-sheathed wires [24]. The value of h l was assumed to be half of the value of the heat transfer between the wire layers of the Bi/Ag-sheathed wire winding pack because Cu-CW coil tapes are inserted and the heat transfer between the layers is dominated by the surface thermal resistance [24]. The value of h b was assumed to be the same as the heat transfer between the Bi/Ag-sheathed wire winding pack and the cooling plate.…”

Section: Analytical Modelmentioning

confidence: 99%

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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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Section: Analytical Modelmentioning

confidence: 99%

Section: Analytical Modelmentioning

confidence: 99%