High-Voltage Superconducting Fault Current Limiters Based on High-Diffusivity Dielectric Substrates

Research output: Contribution to journalLetterpeer-review

Abstract

High-temperature superconducting (HTS) tapes currently used for the manufacture of resistive fault current limiters use metallic substrates upon which the HTS film is grown. Because the alloys used for these substrates, such as Hastelloy, have a rather high resistivity and low thermal conductivity, the HTS film must be protected by a more conducting metallic layer acting as a shunt to avoid burn out during a fault. This shunt layer limits severely the electric field generated during the fault to values smaller than 100 V/m. A long length of tape is then necessary to achieve the desired high voltage. We show here that by using a high thermal diffusivity dielectric substrate such as sapphire, it is possible to obtain much higher electric fields of up to several kilovolts per meter.

Original languageEnglish
Pages (from-to)1961-1963
Number of pages3
JournalJournal of Superconductivity and Novel Magnetism
Volume31
Issue number7
DOIs
StatePublished - 1 Jul 2018

Keywords

  • Dielectric substrate
  • Fault current limiter
  • High temperature superconductor
  • Sapphire EFG ribbon
  • Thermal diffusivity

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