Stabilizers for REBCO Conductors for High Performance SFCL
Résumé
Resistive REBCO Fault Current Limiter (FCL) is a
promising solution to the fault current issue in electric grids, which
is not fully satisfactorily solved. But the cost of the Superconducting
(SC) REBCO conductor should be lowered to facilitate the
deployment of this innovative device. What we refer to as REBCO
conductor is usually a bare REBCO tape bonded to a stabilizer.
The design of the stabilizer is fundamental to optimize the
conductor and lower the SFCL cost. The goal is to limit the
temperature rise for any fault conditions, notably for any
amplitude of the prospective fault current. The specificities of SC
tapes, including critical current inhomogeneities along the length,
must be considered in the design. Here we study various stabilizer
configurations. First the case of “dielectric stabilizer”, electrically
insulating is presented. The theoretical performances are
interesting in terms of electric field under limitation, but the low
thermal diffusivity remains an issue, as well as the implementation.
Some experimental investigations are shown. The results
are compared to classical metallic stabilizer designs, which are
simpler to implement. To enhance the electric field under
limitation, a variant of metallic stabilizer is then introduced, using
a corrugated structure. A design showing an electric field under
limitation of 200 V/m (clearing time of 50 ms) is presented.
Further optimizations and higher electric fields seem achievable
even if practical implementation remains very challenging.
Domaines
Energie électriqueOrigine | Fichiers produits par l'(les) auteur(s) |
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