To develop a High-Tc superconducting (HTS) magnet that is applicable to the high voltage electric device applications, it is necessary to consider several important factors such as large critical current, reliable electric insulation system, stable cryogenic status, expected economic benefits, and so on. This paper deals with the skills to design and manufacture the high voltage HTS DC magnet accepting large pulse input current. The multi-stacked HTS solenoid winding was suggested for the HTS magnet having large critical current. To protect the HTS winding, when quenched, the copper layer was suggested as a buffer sharing the large pulse current. The thin grooves on the GFRP bobbins not only guide the HTS winding but also play the role of electrical insulation for the high voltage application. With regard to the thermal stability of the magnet, sub-cooled liquid nitrogen cooling system was used for the cooling system of the HTS DC magnet. To reduce the resistance of the normal conducting parts in the HTS magnet, several HTS tapes were additionally attached on these parts. Based on this study, the HTS DC magnet for the 2.3 MVA class high-Tc superconducting fault current limiter (HTSFCL) was successfully manufactured and tested. The HTS DC magnet developed by this study endured 2.53 MJ (18.66 MWmax) without any evidence of quench.
Bibliographical noteFunding Information:
Manuscript received October 3, 2004. This work was supported by a grant from Center for Applied Superconductivity Technology of the 21st Century Frontier R&D Program funded by the Ministry of Science and Technology, Republic of Korea.
I. INTRODUCTION WITH the successful commercialization of Bi-2223 powder-in-tube tape and the improving quality & length-scale of YBCO coated tape, the HTS magnet for high magnetic field and electric power applications has been researched & developed actively , . To name a few, there are superconducting magnetic energy storage (SMES), magnetic resonance imaging (MRI), HTSFCL, HTS motor, and HTS transformer. The Dream of Advanced Power system by Applied Superconductivity technologies (DAPAS) program, sponsored by Korean Ministry of Science and Technology (MOST), supports the superconductivity research activities in many areas, one of which is the development of the superconducting power devices. The DC reactor type 3-phase 6.6 kV-200 A (2.3 MVA) class HTSFCL was developed successfully as the 1st phase result of the DAPAS program. It consists of a HTS DC magnet,
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering