Losses and stability in superconducting wire in a.c. fields with frequencies up to 2.5 kHz

Voloshin, I. F.; Fisher, L. M.; Klimenko, E. Yu.; Martovetsky, N.; Hlasnik, I.

doi:10.1016/0011-2275(94)90057-4

Cited by 3 publications

(2 citation statements)

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“…Manuscript Because of their low thermal diffusivity, the dynamic stability of CuNi matrix ac. wires is analyzed using adiabatic models of flux jumping in which all of the heat generation is confined, without propagation, within the saturated filamentary zone [3]- [5]. However, recent experimental results [6] show that the dynamic stability of CuNi matrix wires is strongly influenced by the matrix composition, epoxy impregnation, and the distance between the filamentary region and conductor surface: this suggests that the cooling conditions may play a significant role in dynamic stability.…”

Section: Introductionmentioning

confidence: 98%

“…Because the average equivalent heat generation at a conductor's surface just prior to quench is typically on the order of 10 mW/cm2, the reduced quench currents are commonly attributed to thermal-magnetic instabilities that occur at low levels of overheating above the background temperature [2]- [3]. Manuscript Because of their low thermal diffusivity, the dynamic stability of CuNi matrix ac.…”

Section: Introductionmentioning

confidence: 99%

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Quench currents of AC superconductor in supercritical helium

Michael

Ryu

Tsukamoto

1995

IEEE Trans. Appl. Supercond.

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A bstra ct-Supercritical helium is proposed as a coolant for a.c. superconducting fault current limiters, because it provides better electrical insulation than conventional pool-boiling helium. However, the effect of SHE cooling on the current carrying capacity of a x . devices is presently unknown. Quench currents were measured for two single-strand NbTi conductors and a tightly-wound two-layer coil at 0-200 Hz frequency and 0-1 T d.c. background magnetic induction in boiling atmospheric helium (LHE) and 6-atm, 4.2-K pressurized helium (SHE).The a.c. quench currents for the Cu30%Ni matrix wire were 2 0~3 0 % lower in SHE, while the CulO%Ni matrix composite showed almost identical quench currents in both coolants. Transient thermal analysis suggests that higher internal temperatures resulting from the Cu30 %Ni matrix's smaller thermal diffusivity may be responsible for its reduced current capacity in SHE.

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%