Impedance based Fault Location for weakly meshed distribution networks

Accurate fault location is a challenge for most Distribution Management Systems (DMS). This paper analyses one possible method for Fault Location (FLOC) using impedance information available from Impedance Fault Relay (IFR). This method is applicable for symmetrical as well as un-symmetrical networks. It delivers accurate results for radial as well as meshed networks. The Impedance based FLOC is a combination of graph theory representing the DMS network as a graph of nodes and branches and using creation of nodal admittance matrix to determine relative impedance between any two nodes of the network graph.