Detection of normal transitions in a hybrid single-phase Bi2223 high temperature superconducting transformer by using the active power method and a magnetic flux detection coil

29th International Symposium on Superconductivity

Nanato, N.^1 ; Nakamura, S.^1 ; Tanaka, S.^1

Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima Naka, Kita-ku, Okayama

700-8530, Japan^1

关键词: Active power methods;    Detection coils;    Detection methods;    High temperature superconducting transformers;    HTS transformer;    Induced voltages;    Rated currents;    Secondary coils;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/871/1/012085/pdf
DOI  :  10.1088/1742-6596/871/1/012085

来源: IOP

【 摘 要 】

The authors have been developing a hybrid single-phase Bi2223 high temperature superconducting (HTS) transformer used in the AC current source with rated current of over 500A. Its primary coil is a copper coil and secondary coil is a Bi2223 HTS coil. In this paper, the authors propose a new detection method of normal transitions in the secondary coil by using the active power method and a magnetic flux detection coil attached on the inside of the secondary coil. In the proposed method, the normal transitions are detected by measuring active power dissipated in the secondary coil, and induced voltage of the magnetic flux detection coil by a primary and leakage flux of the secondary coil enables to calculate the active power dissipated in only the secondary coil. As experimental results for a hybrid single-phase Bi2223 HTS transformer, it was found that the proposed method enabled to detect the normal transitions in its secondary superconducting coil.