Accurate fault location algorithm on power transmission lines with use of two-end unsynchronized measurements

Abstract

This paper presents a new approach of fault location on power transmission line. This approach uses two-end unsynchronized measurements of the line and uses the advantages of digital technology and numerical relaying which are available today and can easily be applied for off-line analysis. The approach is based on modifying the apparent impedance method using a very simple first-order formula. It is shown that 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 to be easily transmitted using a digital protection channel. The proposed approach was tested via digital simulation using MATLAB. Applied test results corroborate the superior performance of the proposed approach.