Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: 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.

3
The categories of this paper are: physics
31
The categories of this paper are: ao-sci
28
The categories of this paper are: alg-geom
26
The categories of this paper are: bayes-an
29
The categories of this paper are: funct-an
24
The categories of this paper are: dg-ga
27
The categories of this paper are: comp-gas
7
The categories of this paper are: hep-th
1
The categories of this paper are: cs
16
The categories of this paper are: stat
30
The categories of this paper are: q-alg
2
The categories of this paper are: math
6
The categories of this paper are: astro-ph
13
The categories of this paper are: quant-ph
18
The categories of this paper are: econ
36
The categories of this paper are: cmp-lg