Abstract: An apparatus for monitoring a power capacitor having a housing with a housing interior to be gas-tightly closed off at a housing opening, includes a sensor device outputting a signal as a function of a gas pressure in the housing. An adapter mechanically connects the sensor device to the housing at the housing opening and fluidically connects it to the housing interior. The adapter has a cylindrical adapter body divided into a plurality of functional longitudinal sections and a feed-through for the fluidic connection extending over the plurality of longitudinal sections. A first longitudinal section, disposed in a region of the housing opening after connecting the adapter to the housing, caps or closes off the feed-through in a plane perpendicular to a longitudinal axis of the adapter body and fluidically connects it to the housing interior in at least one plane parallel to the longitudinal axis.

Abstract: A method for discharging an intermediate circuit capacitor of an intermediate voltage circuit converter with an electronic power converter is disclosed, wherein a main switch arranged between an AC power supply network and a primary winding of a transformer is opened and a line contactor connected between a first terminal of a secondary winding of the transformer and a first AC voltage-side connection of the electronic power converter is closed. A second terminal of the secondary winding of the transformer is connected to a second AC voltage-side connection of the electronic power converter. A pre-charging contactor connected in series with a pre-charging resistor is connected in parallel with the line contactor. Two switchable power semiconductors of the electronic power converter, which are located diagonally opposite each other in different branches of the electronic power converter, are switched on.

Abstract: A method for discharging an intermediate circuit capacitor of an intermediate voltage circuit converter with an electronic power converter is disclosed, wherein a main switch arranged between an AC power supply network and a primary winding of a transformer is opened and a line contactor connected between a first terminal of a secondary winding of the transformer and a first AC voltage-side connection of the electronic power converter is closed. A second terminal of the secondary winding of the transformer is connected to a second AC voltage-side connection of the electronic power converter. A pre-charging contactor connected in series with a pre-charging resistor is connected in parallel with the line contactor. Two switchable power semiconductors of the electronic power converter, which are located diagonally opposite each other in different branches of the electronic power converter, are switched on.