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.
Bibliographical noteFunding 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: firstname.lastname@example.org).
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering