Abstract: A design for a high or medium voltage power transmission network is created automatically. The network comprises a plurality of subsystems that are classifiable as switchgear, transformers, transmission lines, or network controllers such as compensators, where each subsystem comprises a plurality of components, where components exist in different embodiments having different technical and economical characteristics, and where the design comprises, for each subsystem, a selection of components such that the subsystem satisfies given technical and financial criteria.

Abstract: A method is specified for operating a multiphase line which is included in a transmission network and can be disconnected if faults occur, for the transmission of electrical power. The method comprises the following method steps: a) detecting upstream and downstream of the line, data which characterize the operating status of the transmission network, b) processing the detected data in order to identify a fault, c) switching off at least one faulty phase of the line on the basis of the identified fault, and d) activating a balancing compensator which feeds compensation currents into the transmission network such that the currents flowing in the transmission networks form a balanced system. This method has the major advantage that, now, even lines subject to faults can be used for the transmission of electrical power.