An Experimental Investigation of the Transient Response of HTS Non-insulation Coil

Zhenyu Zhang, Chul Han Kim, Jin Geun Kim, Jozef Kvitkovic, Sastry Pamidi, Min Zhang, Jianwei Li, Weijia Yuan

Research output: Contribution to journalArticlepeer-review

26 Citations (SciVal)


A single pancake coil without turn-to-turn insulation was tested in this paper to investigate the transient responses under different situations. We performed charging and discharging test, AC current test, and regional quench emulation test on the non-insulated (NI) coil. The experimental test results show a significant time delay for charging and discharging characteristics of NI coil and can be validated by a simple proposed equivalent electrical circuit. Under the AC operating current, the NI coil can bypass nearly all the AC current from the coil spiral path to the radial path such that it is not possible for NI coil to store or be affected by the AC magnet field. Additionally, while carrying AC current, the AC loss dissipation of NI coil is inversely proportional to the frequency of the AC operating current. When a regional quench occurs, the NI coil can bypass the current in the regional quench zone to avoid further temperature accumulated and protect the NI coil itself.

Original languageEnglish
Pages (from-to)387-393
Number of pages7
JournalJournal of Superconductivity and Novel Magnetism
Issue number2
Early online date5 Oct 2016
Publication statusPublished - Feb 2017


  • AC current
  • Charging/discharging test
  • NI coil
  • Quench
  • Turn-to-turn characteristic resistance

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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