Abstract: The invention is concerned with a resistive fault current limiter (FCL) based on thin superconducting films. The FCL comprises constrictions (2) with a reduced critical current, separated by connecting paths (3). Upon occurrence of a fault current, the former turn resistive simultaneously and build up a resistance which allows the applied voltage to drop entirely only over the constrictions. Only at a later stage, the connecting paths become resistive and dissipate energy. The thickness and width of an electrical bypass determine said normal resistivities of the constrictions and the connecting paths.

Abstract: In high-temperature superconductor arrangements having a superconductor 1 and having an electrical bypass 2, their thermal coefficients of expansion &agr;SC, &agr;BP are chosen such that the bypass applies compressive pressure to the superconductor. According to the invention, this situation occurs even when there is a considerable temperature difference &Dgr;T between the bypass and the superconductor, as can be induced by fault currents in the case of current limiters. The thermomechanical compressive pressure prevents the formation or enlargement of cracks in the superconductor. The bypass is preferably made of steel, and is soldered or bonded onto the superconductor with a force fit.