Fault Location on Double-Circuit Series-Compensated Lines Using Two-End Unsynchronized Measurements

This paper presents an accurate fault-location algorithm for double-circuit series-compensated lines. Use of two-end current and voltage signals is taken into account and a more general case of unsynchronized measurements is studied. Different options for analytical synchronization of the measurements are considered. The algorithm applies two subroutines, designated for locating faults on particular line sections, and in addition, the procedure for selecting the valid subroutine. The subroutines are formulated with the use of the generalized fault-loop model, leading to compact formulas. Consideration of the distributed parameter line model ensures high accuracy of the fault location. The proposed selection procedure allows for reliable selection of the valid subroutine. The developed fault-location algorithm has been thoroughly tested using signals taken from Alternate Transients Program-Electromagnetic Transients Program versatile simulations of faults on a double-circuit series-compensated transmission line. The presented fault-location evaluation shows the validity of the derived fault-location algorithm and its high accuracy.