METHOD FOR MONITORING AN ELECTRICITY SUPPLY GRID

A method for monitoring a three-phase electricity supply grid, wherein the electricity supply grid has a grid topology with spatially distributed grid nodes, and a plurality of the grid nodes are in the form of observation nodes at each of which at least one voltage is able to be acquired in terms of absolute value and phase, comprising the steps of acquiring in each case at least one node voltage at each observation node, such that a plurality of node voltages are acquired, wherein each node voltage is characterized by a node phase angle as phase angle of the node voltage, and each node phase angle describes a respective phase angle with respect to a reference phase angle of a voltage, such that a plurality of node phase angles distributed over the grid topology are present, ascertaining at least one phase angle relationship that in each case describes a relationship between at least two of the node phase angles distributed over the grid topology, and checking the electricity supply grid for a grid disturbance on the basis of the at least one phase angle relationship.