Application of a hybrid fault location technique combining impedance and traveling waves to double-circuit transmission line

This paper presents a hybrid fault location technique for double-circuit transmission lines that combines impedance-based and traveling wave methods to achieve accurate fault distance estimation. The proposed algorithm operates using single-terminal measurements and applies a correlation technique to determine the time difference between incident waves caused by a fault and their subsequent reflections. To enhance the identification of reflected waves, an impedance-based pre-estimation calculates a time window in which the reflections are expected to occur. The proposed technique is implemented in a real event from the Mexican utility, where voltage and current signals are processed to compare the proposed methodology with existing single- and double-terminal techniques reported in the literature. Finally, the results show that the proposed method achieves fault location errors below 1 %.