Accurate non-iterative fault location algorithm for three-terminal line

This paper presents a new fault location algorithm for three-terminal line, which utilises unsynchronised measurements of three phase currents and voltages from three line terminals. The algorithm consists of three subroutines designated for locating faults on particular line sections. The valid subroutine is indicated with use of a selection procedure. The distributed parameter line model is strictly considered for formulating all subroutines. The calculations are simple and do not involve iterative calculations. The presented results of the ATP-EMTP evaluation prove the validity of the fault location algorithm and its high accuracy.