Abstract: A method for maintaining a first electrical component includes the following: Temperature measurement values recorded at the first electrical component are stored as a first set of measurement data, and temperature measurement values recorded at least at one second and one third electrical component are stored as second and third sets of measurement data. Taking into account the three sets of measurement data, a verification is carried out to determine whether a maintenance operation is necessary at the first component. There is also described a data-processing system for carrying out the method.

Abstract: A method for monitoring an electrical device connected to an electrical transmission network includes providing measured operating state data of a first electrical device, providing measured operating state data of further electrical devices of the same type as the first electrical device being connected to the transmission network, comparing the operating state data or at least one variable derived therefrom with at least one predetermined data pattern, the operating state data of the first and all further electrical devices being included in the comparison, and providing information about control measures and/or maintenance measures that are to be carried out and are assigned to the data pattern, if the result of the comparison is a match with the data pattern. A data processing device for performing the method is also provided.

Abstract: A converter station has two line-commutated converters for energy transmission via a bipolar high voltage direct current transmission line. In a first operating mode of the converter station the two converters are electrically connected in an anti-parallel circuit to the same pole of the high voltage direct current transmission link and one of the converters is operated as a rectifier and the other converter is operated as an inverter in an network. In a second operating mode the two converters are connected to different poles of the high voltage direct current transmission link and both converters are operated as either rectifiers or inverters in the AC network. In both operating modes a station active power exchanged between the converter station and the AC network is controlled by active power specifications for converter active powers which are exchanged between the converters and the AC network.

Abstract: A converter station includes two line-commutated converters for energy transmission through a bipolar high voltage direct current transmission link. The two converters are electrically connected in an anti-parallel circuit to the same pole of the high-voltage direct current transmission link. One of the converters is operated as a rectifier in an AC grid and the other converter is operated as an inverter in the AC grid. A station reactive power exchanged by the converter station with the AC grid is controlled by real power stipulations for converter real powers which are exchanged between the converters and the AC grid. A method for operating the converter station is also provided.

Abstract: A converter station has two line-commutated converters for energy transmission via a bipolar high voltage direct current transmission line. In a first operating mode of the converter station the two converters are electrically connected in an anti-parallel circuit to the same pole of the high voltage direct current transmission link and one of the converters is operated as a rectifier and the other converter is operated as an inverter in an network. In a second operating mode the two converters are connected to different poles of the high voltage direct current transmission link and both converters are operated as either rectifiers or inverters in the AC network. In both operating modes a station active power exchanged between the converter station and the AC network is controlled by active power specifications for converter active powers which are exchanged between the converters and the AC network.

Abstract: A converter station includes two line-commutated converters for energy transmission through a bipolar high voltage direct current transmission link. The two converters are electrically connected in an anti-parallel circuit to the same pole of the high-voltage direct current transmission link. One of the converters is operated as a rectifier in an AC grid and the other converter is operated as an inverter in the AC grid. A station reactive power exchanged by the converter station with the AC grid is controlled by real power stipulations for converter real powers which are exchanged between the converters and the AC grid. A method for operating the converter station is also provided.