Abstract: The invention is directed to an electrical liquid contact for an electrical machine such as an electric unipolar machine with a horizontal shaft. The liquid contact includes a ring gap which is sealed laterally by ring gaps which extend at an angle or radially and in which the metallic liquid present therein is set in rotation. This is accomplished by a circulating pump located outside the ring gap. In addition, the speed of rotation in the ring gap is matched to the pressure of the liquid by changing the cross-sectional area of the passage through which the liquid flows.

Abstract: A current limiting device for a network which comprises a magnetically shielded superconductor coupled to the network with the shielding means having controllable magnetizing coils by which they can be transversely magnetized up to saturation.

Abstract: Device for securing a superconductive exciter winding in a thermally insulating, thermally elastic and short-circuit proof manner within the rotor of a turbogenerator wherein the rotor has a body part thereof formed as a hollow cylinder, including a plurality of telescoping intermediate cylinders disposable within the hollow cylinder spaced from and coaxial to one another and to the hollow cylinder, the intermediate cylinders forming cold shields and damping means, the hollow cylinder being closed at both ends thereof, a support cylinder located within and spaced from the innermost of the telescoping intermediate cylinders and adapted to support a superconductive exciter winding on the inner side thereof, means for connecting the cylindrical rotor body part through the intermediate cylinders to the support cylinder force-lockingly yet resiliently in radial direction and free to expand in axial direction, the spaces between the cylinders being evacuated so as to insulate the cylinders thermally one from the ot