This paper presents a new approach to fault location on power transmission
lines. This approach uses two-end unsynchronised measurements of the line and
benefits from the advantages of digital technology and numerical relaying,
which are available today and can easily be applied for off-line analysis.
The approach is to modify the apparent impedance method using a very simple
first-order formula. The new method is independent of fault resistance,
source impedances and pre-fault currents. In addition, the data volume
communicated between relays is sufficiently small enough to be transmitted
easily using a digital protection channel. The proposed approach is tested
via digital simulation using MATLand the applied test results corroborate
the superior performance of the proposed approach
