Accurate fault location algorithm for faults between two lines of double-circuit transmission line based on differential network

The remarkable mutual inductance between two lines of the parallel lines in extra high voltage power system and the shunt capacitance are necessary to be taken into account in fault location. Based on differential network, an accurate fault location algorithm for the situation between two lines of double-circuit transmission lines on the same tower is described, where post-fault voltages and currents derived from one terminal are employed in the location and the shunt capacitance is considered. The algorithm is independent of source impedance and fault resistance. The presented algorithm maintains high accuracy for double-circuit transmission lines and the locating equation leads to the unique solution. The simulation results indicate that the maximal error is less than 0.05% theoretically.