MgB2-based superconductors for fault current limiters

V. Sokolovsky, T. Prikhna, V. Meerovich, M. Eisterer, W. Goldacker, A. Kozyrev, H. W. Weber, A. Shapovalov, V. Sverdun, V. Moshchil

Research output: Contribution to journalConference articlepeer-review

Abstract

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 MgB2 prepared 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 MgB2 rings (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.

Original languageEnglish
Article number012144
JournalIOP Conference Series: Materials Science and Engineering
Volume171
Issue number1
DOIs
StatePublished - 1 Mar 2017
Event26th International Cryogenic Engineering Conference, ICEC 2016 and International Cryogenic Materials Conference 2016, ICMC 2016 - New Delhi, India
Duration: 7 Mar 201611 Mar 2016

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