Temperature Rise of Copper and HTSC Tapes in Liquid Nitrogen by a Step-wise Current Pulse

Degtyarenko, P. N.; Dul'kin, I. N.; Fisher, L. M.; Garas’ko, G.I.; Kalinov, A. V.; Vavilov, S. B.; Voloshin, I. F.

doi:10.1016/j.phpro.2012.06.174

Cited by 2 publications

(2 citation statements)

References 5 publications

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“…At 70 K, convective heat transfer is stable up to a conductor temperature of 85 K, ∆T=15 K, at power density up to about 1.0 W/cm 2 . Nucleate boiling is initiated at a power density range of 1.5 W/cm 2 with thermal runaway Figure 3, as reported by other researchers who observed similar successions of transient temperature response curves Figure 3, as reported by other researchers who observed similar successions of transient temperature response curves 5,25 ,as ,as…”

Section: Film Boilingsupporting

confidence: 82%

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Heat transfer and recovery performance enhancement of metal and superconducting tapes under high current pulses for improving fault current-limiting behavior of HTS transformers

Yazdani-Asrami

Staines

Sidorov

et al. 2020

Supercond. Sci. Technol.

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High temperature superconducting (HTS) transformers windings operate subcooled at atmospheric pressure to temperatures as low as 65 K, with minimal power dissipation from AC loss in normal operation. During short circuits, HTS transformers are subjected to transient heating by currents as much as 10x rated current for durations of up to 2 s.After isolating the fault, HTS transformers are required to cool back down to their base temperature while carrying the operating current. HTS transformer conductors are insulated, typically with wrapped self-adhesive polyimide tape, and windings consist of close packed conductors wound on composite formers.In this paper, the heat transfer, transient thermal response, and recovery performance of brass-laminated coated conductor HTS wire as well as metallic conductors in liquid nitrogen (LN2) were measured at a range of temperatures from 77 K to 64 K and pressures from atmospheric to 0.14 bar in heating and cooling situations. Measurements were made on bare tapes, and on tapes wrapped with polyimide insulation tape and with aramid paper as well as polymer coated tapes with a range of coating thickness. Heat transfer from tapes mounted with one face in contact with a glass-epoxy composite cylindrical former was measured for comparison with free-standing tapes. Using conductors with solid polymer coatings of optimized thickness immersed in subcooled LN2 results in the highest heat transfer and fast recovery following heating to 300 K by a high current pulse. Compared to a bare tape in LN2 at ambient pressure at 77 K, the heat transfer in a coated tape in 65 K subcooled LN2 can be very significantly enhanced, by up to a factor of 15x, and recovery can be 7x faster.

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Section: Film Boilingsupporting

confidence: 82%

“…Three different heat transfer regimes: natural convection, nucleate boiling, and film boiling, can be distinguished in Figure 3, as reported by other researchers who observed similar successions of transient temperature response curves 5,25 ,as follow:…”

Section: Heating At 77 K Svp and Subcooled Ln2supporting

confidence: 69%

Heat transfer and recovery performance enhancement of metal and superconducting tapes under high current pulses for improving fault current-limiting behavior of HTS transformers

Yazdani-Asrami

Staines

Sidorov

et al. 2020

Supercond. Sci. Technol.

View full text Add to dashboard Cite

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Fault Current Limitation in Electrical Power Networks Containing HTS Cable and HTS Fuse

et al. 2022

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Numerical calculations of parameters of an electrical power network where an HTS fuse is used as a fault current limiting device have been done. The calculations were performed for networks containing different types of HTS cables as well. The design of HTS fuse was developed based on the numerical calculation for the network-rated parameters considering the special types 2G HTS tape characteristics. The distinctive feature of these tapes is the minimal thickness (about 30 µm) of the substrate at the critical current 450–600 A. The tests were performed at a voltage of 1 kV and demonstrated the ability of circuit breaking at fault currents about 3–4 kA. A comparison of experimental results with the calculations allows us to conclude that the HTS fuse of this design can operate as a fault current limiting device in electrical power networks at various rated voltage levels.

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Temperature Rise of Copper and HTSC Tapes in Liquid Nitrogen by a Step-wise Current Pulse

Cited by 2 publications

References 5 publications

Heat transfer and recovery performance enhancement of metal and superconducting tapes under high current pulses for improving fault current-limiting behavior of HTS transformers

Heat transfer and recovery performance enhancement of metal and superconducting tapes under high current pulses for improving fault current-limiting behavior of HTS transformers

Fault Current Limitation in Electrical Power Networks Containing HTS Cable and HTS Fuse

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