Two-end unsynchronized fault location algorithm for double-circuit series compensated lines

This paper presents an accurate fault location algorithm for double-circuit series compensated lines. Use of two-end current and voltage signals with taken into account 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 the procedure for selecting the valid subroutine. The subroutines are formulated with use of the generalized fault loop model, leading to compact formulae. Taking into account the distributed parameter line model assures high accuracy of fault location. Application of 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 ATP-EMTP versatile simulations of faults on a double-circuit series compensated transmission line. The presented fault location example shows the validity of the derived fault location algorithm and its high accuracy.