MgB2-based superconductors for fault current limiters

26th International Cryogenic Engineering Conference & International Cryogenic Materials Conference 2016

材料科学;物理学

Sokolovsky, V.^1 ; Prikhna, T.^2 ; Meerovich, V.^1 ; Eisterer, M.^3 ; Goldacker, W.^4 ; Kozyrev, A.^2 ; Weber, H.W.^3 ; Shapovalov, A.^2 ; Sverdun, V.^2 ; Moshchil, V.^2

Ben-Gurion University of the Negev, P.O.B. 653, Beer-Sheva

84105, Israel^1

Institute for Superhard Materials, National Academy of Sciences of Ukraine, 2 Avtozavodskaya Street, Kiev

04074, Ukraine^2

Atominstitut, TU Wien, Stadionallee 2, Vienna

1020, Austria^3

Karlsruhe Institute of Technology (KIT), Eggenstein

76344, Germany^4

关键词: AC loss;    Activation currents;    Bulk MgB2;    Current problems;    Low impedance;    Quasihydrostatic pressure;    Steady state fault;    Transformer types;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/171/1/012144/pdf
DOI  :  10.1088/1757-899X/171/1/012144

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

A promising solution of the fault current problem in power systems is the application of fast-operating nonlinear superconducting fault current limiters (SFCLs) with the capability of rapidly increasing their impedance, and thus limiting high fault currents. We report the results of experiments with models of inductive (transformer type) SFCLs based on the ring-shaped bulk MgB2prepared under high quasihydrostatic pressure (2 GPa) and by hot pressing technique (30 MPa). It was shown that the SFCLs meet the main requirements to fault current limiters: they possess low impedance in the nominal regime of the protected circuit and can fast increase their impedance limiting both the transient and the steady-state fault currents. The study of quenching currents of MgB2rings (SFCL activation current) and AC losses in the rings shows that the quenching current density and critical current density determined from AC losses can be 10-20 times less than the critical current determined from the magnetization experiments.