Faulty phase selection for transmission line using integrated moving sum approach

This study presents a transmission line fault classification algorithm using integrated moving sum (IMSUM) technique. The method is based on current signal only. In this method, the decision of moving sum approach-based fault detection unit is used in integration with the proposed method to obtain accurate fault class. Rules are set for all ten types of fault. Considering half cycle computed data from the instant of fault inception classification is possible. High-resistance far-end fault, close-in fault, fault at different inception angle and fault considering variable prefault loading conditions can be easily classified using IMSUM technique. Severe current transformer saturation and weak infeed conditions are also discussed. The method can also be applied to a series compensated line. Any variation in fault and system condition will not alter the decision period of IMSUM technique which is an exceptional attribute for a protective function.