Title :
Tests of 100 kW High-T/sub c/ superconducting fault current limiter
Author :
Paul, W. ; Baumann, T. ; Rhyner, J. ; Platter, F.
Author_Institution :
ABB Corp. Res., Baden, Sweden
fDate :
6/1/1995 12:00:00 AM
Abstract :
An inductive superconducting fault current limiter has been built and tested. It mainly consists of a copper coil, a superconducting tube, and an iron core which are concentrically arranged. The device is essentially a transformer with the secondary winding being the tube. The tube has diameter of 20 cm, a height of 35 cm, and is made of Bi2212 ceramic, fabricated by partial melting. The ceramic has the voltage current characteristic V-I/sup /spl alpha// with /spl alpha//spl ap/5. The critical current density defined by the 1 /spl mu/V/em criterion is about 1400 A/cm/sup 2/. Depending on the number of turns of the coil, the nominal current of the device was between 130 A and 250 A. In short circuit tests in a 480 V circuit, the prospective fault current of 8 kA was limited to about 5 times the nominal current. The test results are in good agreement with detailed simulations of both the normal operation (e.g. impedance, AC-losses) and the behaviour under fault conditions (i.e. evolution of the current).<>
Keywords :
current limiters; electron device manufacture; high-temperature superconductors; overcurrent protection; power system protection; power transformers; short-circuit currents; superconducting coils; switchgear testing; transformer cores; transformer windings; 100 kW; 130 to 250 A; 20 cm; 35 cm; 480 V; 8 kA; Bi; V-I characteristic; ceramics; coil; critical current density; fabrication; fault current limiter; high-T/sub c/ superconductor; iron core; partial melting; secondary winding; short circuit tests; superconducting tube; transformer; Ceramics; Circuit simulation; Circuit testing; Copper; Critical current density; Fault current limiters; Fault currents; Iron; Superconducting coils; Transformer cores;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
