Detection of quench in HTS transformer windings

Y. Hwang, S. Lee, W. Kim, K. Choi, Haigun Lee

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

HTS winding for power applications have been developed by improving HTS wire performance. A critical current of HTS winding is determined by a standard criterion of 1 μV/cm In DC operation. Determining a critical current of the HTS winding is more complicated in AC operation. A terminal voltage of a winding contains contributions from a resistive component and an inductive component. Moreover, when the load current crosses over the critical current in the HTS winding, the growth of the resistance is not so fast. The critical criterion of AC current is not defined yet. In this paper, we investigated the detection of critical criterion of HTS windings in AC operation by acoustic emission (AE) and other techniques. An AE sensor was attached on a continuous disk winding and we compared the results with the DC critical current. The results showed that the sensor caught reasonable acoustic signals at the current level below the DC critical current.

Original languageEnglish
Pages (from-to)1229-1232
Number of pages4
JournalPhysica C: Superconductivity and its Applications
Volume463-465
Issue numberSUPPL.
DOIs
Publication statusPublished - 2007 Oct 1

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Keywords

  • AC losses
  • Acoustic emission
  • Continuous disk winding
  • High voltage HTS transformer

ASJC Scopus subject areas

  • Condensed Matter Physics

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