Time-Frequency-based insulation diagnostic technique of higherature superconducting cable systems

Geon Seok Lee, Gu Young Kwon, Su Sik Bang, Yeong Ho Lee, Seung Jin Chang, Song Ho Sohn, Kijun Park, Yong June Shin

Research output: Contribution to journalArticle

7 Citations (Scopus)


For the electrical insulation of a higherature superconducting (HTS) cable, wrapped polypropylene laminated paper (PPLP) tape is typically used. Unfortunately, it is possible that unexpected faults at insulation layers will be present in the cables as a result of either a problematic manufacturing process or an incomplete installation procedure. In order to protect against operational failures of grid-connected HTS cable systems, this paper proposes a nondestructive diagnostic technique, i.e., time-frequency domain reflectometry (TFDR), and focuses on the characteristic of HTS cable that caused the local insulation defects. To verify the performance of the proposed method, detection and localization of local insulation failure via TFDR are compared with traditional time-domain reflectometry. The experiments are conducted at room temperature and under liquid nitrogen in order to check the efficacy of the proposed method in varieties of HTS cable's conditions. In addition, to improve the accuracy of detection and localization, a methodology to analyze incident signals, which are composed of upchirp and downchirp signals, is presented.

Original languageEnglish
Article number7397933
JournalIEEE Transactions on Applied Superconductivity
Issue number4
Publication statusPublished - 2016 Jun

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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