Abstract: An electrically poorly conductive material for producing external glow-discharge protection for an electrical conductor, includes a base material which is provided with a conductive coating on at least one side. In order to ensure adequate external glow-discharge protection and cost-effective production of an insulating sleeve, even for high rated voltages, the conductive coating is produced essentially from carbon, which has microcrystalline and amorphous structures.

Abstract: A conductor winding configuration for a large electrical machine has a supporting body and at least one winding element. The at least one winding element is inserted into an associated slot in the supporting body and has at least one electrical conductor. The at least one electrical conductor is sheathed by insulation which, for its part, is surrounded by a first protective layer. The first protective layer is in turn surrounded by a second protective layer. The protective layers rest against one another with surfaces that ensure free movement of the protective layers against one another.

Abstract: A supporting element or core stack for an electric winding, in particular for a stator of a turbogenerator, includes a supporting surface to which an electric conductor can be attached. The supporting surface is provided with a coating for corona shielding. A turbogenerator has the supporting element. A method of producing a corona shield for an electric winding disposed on a supporting element, includes providing the supporting element with a coating for corona shielding.