Method and device for fault diagnosis in an electrical network having a ring structure, and computer program product

摘要

Method for fault diagnosis in an electrical network (1, 1 ') having a ring structure with a plurality of lines (L12, L13, L23) and a plurality of nodes (K1, K2, K3), at least two lines being outgoing lines (L12, L13), at least a line is a cross line (L23) connecting a pair of outgoing lines (L12, L13), a node is a collecting node (K1) fed by an AC voltage source (4) to which the outgoing lines (L12, L13) are connected, and at least two nodes are cross-connection nodes (K2, K3) to which the pair of outgoing lines (L12, L13) are connected to the cross line (L23), a node fault location AC resistance value between a fault location (F) on a faulty line and one the node (K1, K2, K3) as a function of cross-AC resistance values, each of which has a cross-AC resistance (Z, Z) of an energy conversion device (7a, 7) connected to an outgoing line (L12, L13) 7b) describe in a negative sequence system, - AC line resistance values, which each describe an AC resistance (Z, Z, Z) of one of the lines (L12, L13, L23), and - outgoing line current values, each of which at the common node (K1) into one of the outgoing lines ( L12, L13) current flowing (I, I) describe in the opposite system, is determined.