Abstract: An energy storage device is provided with at least one energy storage unit (1). The energy storage unit (1) comprises a thermal storage element (3) made of a solid material and an electrical heating device (5) for heating the thermal storage element (3). According to a first concept, the electrical heating device (5) is adapted to heat the thermal storage element (3) by means of generating an electric current within the material of the thermal storage element (3). According to a second concept, an electric gas insulation (8) is provided, in order to electrically insulate the electrical heating device (5) from the thermal storage element (3). Furthermore, a method for storing energy by means of such an energy storage device is provided.

Abstract: Electrical bushing for medium and high voltage comprising a dielectric bushing main body a conductor extending through the bushing main body and being electrically insulated by the bushing main body, at least a conductive foil concentrically arranged around the conductor along at least a part of its length, and a barrier layer at least partially covering an edge region of said conductive foil, wherein the barrier layer has a dielectric strength greater than the dielectric strength of the dielectric bushing main body and greater than 150 kV/mm.

Abstract: A socket, connectable to a plug-in device, wherein the plug-in device is a bushing and/or a plug-in cable termination, is described. The socket includes a current conduction path and a field control unit.

Abstract: An energy storage device is provided with at least one energy storage unit (1). The energy storage unit (1) comprises a thermal storage element (3) made of a solid material and an electrical heating device (5) for heating the thermal storage element (3). According to a first concept, the electrical heating device (5) is adapted to heat the thermal storage element (3) by means of generating an electric current within the material of the thermal storage element (3). According to a second concept, an electric gas insulation (8) is provided, in order to electrically insulate the electrical heating device (5) from the thermal storage element (3). Furthermore, a method for storing energy by means of such an energy storage device is provided.

Abstract: Electrical bushing for medium and high voltage comprising a dielectric bushing main body a conductor extending through the bushing main body and being electrically insulated by the bushing main body, at least a conductive foil concentrically arranged around the conductor along at least a part of its length, and a barrier layer at least partially covering an edge region of said conductive foil, wherein the barrier layer has a dielectric strength greater than the dielectric strength of the dielectric bushing main body and greater than 150 kV/mm.