65 research outputs found
Thermal regimes of HTS cylinders operating in devices for fault current limitation
We reveal obstacles related to the application of HTS cylinders in current
limiting devices based on the superconducting - normal state transition. It is
shown that, at the critical current density achieved presently in bulk
materials, and especially in BSCCO-2212, the required thickness of the cylinder
wall in a full-scale inductive device achieves several centimeters. A simple
mathematical model of the operation of an inductive fault current limiter (FCL)
is used to show that such cylinders cannot be cooled in admissible time after a
fault clearing and, hence, the inductive FCLs and current-limiting transformers
employing BSCCO cylinders do not return to the normal operation in the time
required. For the recovery even with a non-current pause in the circuit, the
cylinders are needed with the critical current density by an order higher than
the existed ones.Comment: 15 pages, 5 figure
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