Accurate location of faults on series-compensated lines with use of two-end unsynchronised measurements

Abstract

This paper presents accurate fault location algorithm for series compensated lines. Use of two-end current and voltage signals with a more general case of unsynchronised measurements is considered. Two ways of synchronisation of measurements are presented. The subroutines of the developed algorithm are formulated with use of the generalised fault loop model, leading to compact formulae. High accuracy of fault location is assured due to strict considering the distributed parameter line model. The distance to fault calculation is independent on the parameters of the compensating bank. Multi-criteria efficient procedure for selecting the valid subroutine is presented. The developed fault location algorithm has been thoroughly tested using signals taken from ATP-EMTP versatile simulations of faults on a series-compensated transmission line. The example of fault location is presented and discussed.