Monitoring method for an unbalanced three-phase HTS cable system via time-frequency domain reflectometry

Geon Seok Lee, Gyeong Hwan Ji, Gu Young Kwon, Su Sik Bang, Yeong Ho Lee, Song Ho Sohn, Kijun Park, Yong June Shin

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)


In this paper, we propose a new time-frequency based analysis method that monitors the state of the high temperature superconducting (HTS) cable system in a real-time manner and detects the current imbalance of HTS cable system. The new time-frequency-based method utilizes the cross Wigner-Ville distribution to analyze the time-frequency localized phase difference of the reflected signal, which varies depending on the insulation characteristics of the HTS cable system. Also, a real-world AC 22.9 kV 50 MVA HTS cable system and a current source are used to validate the performance of the new monitoring method in order to detect current imbalance phenomenon.

Original languageEnglish
Article number8302531
JournalIEEE Transactions on Applied Superconductivity
Issue number4
Publication statusPublished - 2018 Jun

Bibliographical note

Funding Information:
Manuscript received September 14, 2017; accepted February 14, 2018. Date of publication February 27, 2018; date of current version March 19, 2018. This work was supported by the National Research Foundation of Korea grant funded by the Ministry of Science, ICT and Future Planning, #NRF-2017R1A2A1A05001022 and also by Korea Electric Power Corporation Research Institute. (Corresponding author: Yong-June Shin.) G. S. Lee, G. H. Ji, G.-Y. Kwon, S. S. Bang, Y. H. Lee, and Y.-J. Shin are with the School of Electrical and Electronic Engineering, Yonsei University, Seoul 03722, South Korea (e-mail:

Publisher Copyright:
© 2002-2011 IEEE.

All Science Journal Classification (ASJC) codes

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


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