摘要：Exact fault location detection is vital for power system restoration and security purposes.
The line parameters plays a key role for accurately detecting fault location in a transmission
line of a power network. In other fault location algorithms, line parameters used are
approximately constant and they varies with weather and loading conditions also. So, an
algorithm which is independent of the line parameters, is more accurate , flexible and
robust.This paper presents a numerical algorithm for locating fault in a short transmission
line with improved accuracy. This algorithm is independent of the line parameters for
locating fault and accuracy of the algorithm is improved by using filtering algorithm. The
performance of the algorithm is tested on several power networks by Simulation carried
out by PSCAD/EMTDC. It is found that the accuracy of the algorithm can be further
improved by using a Butterworth 2nd order filter ,which is used for the better refinement
of collected current and voltage signals and to eliminate unwanted frequency components.
A fault classification approach by use of zero sequence components of power and a faulty
phase detection approach by the study of change of phase currents are also presented in
the paper.
