Adaptive distance protection of a double-circuit line using artificial neural nets

Serious power system disturbances are often caused by faults in a weakened power system. In these cases, over-tripping of relays and sympathy trips easily happen because of inappropriate settings. In this paper, the effects of inappropriate settings are shown by the simulation of the distance protection of a double-circuit transmission line. A strategy is presented in this paper for the implementation of artificial neural nets (ANN) in an automated substation keeping the settings of all distance relays in the substation appropriate. The required information and equipment are described. The strategy also serves as a guideline for the use of an ANN