Method and device for identifying the location of a fault on a line of an electrical power supply network

A method for identifying a location of a fault on a faulty line of an electrical power supply network having a plurality of lines, a plurality of inner nodes each connecting at least three of the lines to one another, and at least three outer nodes, wherein the outer nodes each bound a line and being provided with measurement devices being used to measure high-frequency current and/or voltage signals, which method comprises:

• using the measurement devices to detect respective times at which traveling waves arrive at the outer nodes on a basis of the high-frequency current and/or voltage signals measured, after the fault has occurred on the faulty line;
• selecting one of the outer nodes as a starting node for a search for the fault location;
• starting from the starting node, paths to the other outer nodes being determined, the paths formed from the plurality of lines and the inner nodes, and the paths on which the fault location could be located, in principle, are selected;
• mapping the electrical power supply network to at least one tree structure in order to identify the paths;
• and
• identifying, a line on which the fault location could be located, in principle, for each of the paths selected using the respective times at which the traveling waves arrive, and a potential fault location is determined for a respectively identified line.