OVERHEAD LINES FAULT LOCATION AND ARC VOLTAGE ESTIMATION NUMERICAL ALGORITHM DERIVED IN TIME-DOMAIN

A new fault location numerical algorithm based on terminal data and de rived in time domain is presented. The fault location and its nature ( arcing or arcless fault) are estimated using least error squares techn ique. The faulted phase voltage is modelled as a serial connection of fault resistance and are voltage. The new approach does not require th e line zero sequence resistance as an input datum. In the paper some i mportant features of are voltage are given. The algorithm is derived f or the most frequent case of single-phase line to ground unsymmetrical fault. The results of algorithm testing by computer simulation and un der laboratory conditions are given. The influences of remote infeed, fault resistance, higher order harmonics, network topology and other f actors are investigated and presented.