Abstract: The invention relates to an electric generator, comprising a rotor; a stator enclosing the rotor; a housing; a water-operated cooling device, comprising a water inlet and a water outlet and channels in the rotor and stator for guiding cooling water through the same; the housing is enclosed; the water-operated cooling device is the only cooling device of the generator.

Abstract: The invention relates to a corona shield for an electrical conductor in a rotating electric machine, comprising an outer corona shield and a terminal corona shield which is mounted adjacent to the outer corona shield, on a high-voltage insulation of the electrical conductor, and also comprising a strip that has a limited electrical conductivity, is arranged around the high-voltage insulation of the electrical conductor, and is impregnated with a resin. The invention is characterized in that a paint having a limited electrical conductivity is arranged at least between the high-voltage insulation and the strip, in the transition zone between the outer corona shield and the strip of the terminal corona shield.

Abstract: The invention concerns a monitoring device for a double-fed electrodynamic asynchronous machine, having a stator and a rotor body held rotatably therein, whose shaft is mounted on at least one bearing, and at least one insulation layer for electrical insulation of the rotor body with respect to a zero potential. The invention is characterised by at least one contact element for tapping an electric voltage, which is applied with respect to the zero potential by means of said at last one insulation layer, and a measuring and signalling unit, which is connected to the contact elements for measuring the applied voltage and is designed for emitting a warning signal depending on the height of said voltage.

Abstract: The invention relates to an electric generator, comprising a rotor; a stator enclosing the rotor; a housing; a water-operated cooling device, comprising a water inlet and a water outlet and channels in the rotor and stator for guiding cooling water through the same; the housing is enclosed; the water-operated cooling device is the only cooling device of the generator.