For determining the topology of a network section (1) of an AC network (4) having a network connection point (3), at least one strand (5-9) outgoing from the network connection point (3) with a plurality of energy consumption units (12, 13) and / or energy generation units ( 14/15, 16/18, 17/19, 20/21) and at least one measuring point in which at least one string (5-9), are variations of connection performance of at least one of the plurality of energy consumption units (12, 13) and / or Power generation units (14/15; 16/18; 17/19; 20/21) and variations of the mains voltage measured at the at least one measuring point of the network section (1). Then, dependencies of the variations of the line voltage at the at least one measurement point on the variations of the connection powers of at least some of the plurality of power consumption units (12, 13) and / or power generation units (14/15; 16/18; 17/19; 20/21) certainly.
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