TRANSMISSION-LINE FAULT LOCATION FOR SINGLE-PHASE-TO-EARTH FAULT ON NON-DIRECT-GROUND NEUTRAL SYSTEM

A new method for locating single-phase-to-earth fault on transmission line of non-direct ground neutral system is presented. The method empl oys the faulted phase network and zero-sequence network as the fault l ocation model. It effectively eliminates the effect of load and fault resistance on the accuracy of fault location. The technique embodies a n accurate location by measuring only one local end data. The method i s used in a procedure that provides the automatic determination of fau lted line and phase, rather than requires engineer to specify them. Si mulation results have shown the effectiveness of the algorithm under t he condition of earth fault.