Generally, Nb3SN and NbTi wires are used widely in superconducting applications. However, these wires are expensive and have low critical temperature (Tc of Nb3SN=18 K, Tc of NbTi=9.8 K). To maintain the low-temperature condition, liquid helium is required continuously for cooling the wire and this causes lots of maintenance cost. However, MgB2 wire has higher critical temperature than Nb3SN and NbTi wires as 39 K. The MgB2 wire does not need liquid helium and is able to make under the critical temperature condition using cryogen free cooling system such as conduction cooling system. Also, MgB2 wire has an advantage of low price. Therefore, if we adopt MgB2 wire to superconducting applications, we get advantages such as operating temperature, price, and cryogen free cooling system. In this paper, the authors develop a low temperature superconducting (LTS) magnet with MgB2 wire for a 10 kW DC induction furnace. Firstly, a MgB2 magnet is designed and analyzed using finite element method for a 10 kW DC induction furnace. Secondly, the magnet is fabricated using dry-winding method with metal insulation. Finally, MgB2 magnet is assembled into the 10 kW DC induction furnace to evaluate its performance and characteristics. As a result, the MgB2 magnet guaranties a satisfactory performance with low price and highest critical temperature among LTS wires. The low temperature as 20 K, which is the operating temperature of the MgB2 magnet, can be achieved by a conduction cooling system. This study will be effectively utilized for a 300 kW DC induction furnace and other superconducting magnet applications.
Acknowledgements: This work was supported by the Power Generation & Electricity Delivery Core Technology Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP), granted financial resource from the Ministry of Trade, Industry & Energy, Republic of Korea. (No. 20142020103940)
|Submitters Country||Republic of Korea|