Toroidal superconducting transformer with cold magnetic core _ results of analysis and measurements

11th European Conference on Applied Superconductivity

Grzesik, B.^1 ; Stepien, M.^1

Silesian University of Technology, Faculty of Electrical Engineering, B. Krzywoustego 2, Gliwice

44-100, Poland^1

关键词: ANSYS software;    Coupling coefficient;    Electrical and mechanical properties;    Input current;    Number of turns;    Output power;    Power densities;    Superconducting transformer;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/507/3/032043/pdf
DOI  :  10.1088/1742-6596/507/3/032043

来源: IOP

【 摘 要 】

The paper is focused on a toroidal superconducting transformer with cold magnetic core. The transformer was developed aiming at the solution where magnetic core could operate immersed in LN2, not having much higher power losses than a core operating in room temperature. The second aim is concerned to the perpendicular component of the magnetic flux. It was assumed that it should be minimized. The third aim is required maximal coupling coefficient between windings. Magnetic material METGLAS 2605 SA1 (Metglas Ltd) was selected as the best taking electrical and mechanical properties into account. Numerical analysis of the transformer was carried using ANSYS software. It was assumed that magnetic core could be put inside windings and/or outside of it. The analysis and measurements yield that the best solution is the transformer with magnetic core put inside the windings. Such a construction reduces significantly perpendicular component of the magnetic field in HTS wire. Because outer winding is put on the inner one it gives maximal possible coupling coefficient. The primary and the secondary have the same number of turns. It means bifilar way of winding. The described transformer has the following constructional data: i) diameter of the main circle: 144 mm, ii) maximal diameter: 208 mm, iii) diameter of the small cross-section of the transformer (without external magnetic core): 50 mm and it results with the following parameters: output power 1.59 kVA, power density 700 VA/kg, efficiency: 99.5, coupling coefficient 0.99 at 100 ARMSof input current and maximum flux density 1.2 T.