Novel numerical algorithm for overhead lines protection and adaptive autoreclosure

A new fault location numerical algorithm based on one terminal data processing and derived in the time domain is presented. The fault location and its nature (arcing or arcless fault) are estimated using the least error squares technique. The arc, occurring on the fault point, is included into the problem consideration. By introducing the pre-fault load current, the better algorithm performances are achieved. The algorithm is derived for the case of a three phase symmetrical fault. The results of the algorithm testing through computer simulation are presented. The algorithm sensitivity to arc elongation effects are also tested.