Regensburg 2007 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 12: Symposium “Coated HTS Conductors”
TT 12.4: Vortrag
Dienstag, 27. März 2007, 10:45–11:00, H20
Limitation of fault current in power grids using YBCO coated conductors — •Wolfgang Schmidt1, Hans-Peter Krämer1, Heinz-Werner Neumüller1, Urs Schoop2, Alex Malozemoff2, and Alex Otto2 — 1Siemens AG, Corporate Technology, Erlangen, Deutschland — 2American Superconductor Corporation, Westborough (MS), USA
Resistive type superconducting fault current limiters (FCL) utilize a current-driven transition from the superconducting state to the normal state to limit short circuit currents in electric power grids. The FCL needs not triggering and recovers automatically after the short circuit has been opened. The technical performance of superconducting fault current limiters has been demonstrated within numerous successful projects worldwide. Since the advent of commercial second generation (2G) high temperature superconductor wires based on YBCO thin films, also the economic feasibility comes into reach. We have investigated the fault current limiting performance of 344 superconductors stabilized with stainless steel sheets supplied by American Superconductor Corporation within a co-operation with Siemens Corporate Technology. Bifilar coils have been manufactured and tested with a typical limitation period of 50 ms under stepwise increasing voltage loads to determine the maximum temperature the wires can withstand without degradation. Several coils have been assembled into a limiter model to demonstrate uniform tripping of the individual coils and fast recovery with few seconds. Test results of single coils and of the coil assembly are presented and further developments will be discussed.