Phasor Domain Single-Ended Transmission Line Fault Location Method Based on Harmonics without Remote Side Information

Abstract

Based on the harmonics within the power system, in this paper, a phasor domain single-ended transmission line fault location method is proposed. The method does not require communication channels from the remote terminal, and works without remote side voltages, currents, or source impedances. First, the apparent impedance at the fundamental frequency seen by the relay at the local terminal is presented. Second, with the apparent impedance at an example harmonic, additional information is introduced to the fault location problem, resulting in 4 real equations and 4 real unknowns. Finally, the unknowns are solved via Newton's method, including the fault location. Numerical experiments verify that the proposed single-ended fault location method presents higher fault location accuracy compared to the existing single-ended fault location method without remote side information in <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">t</sup> he IEEE C37.114 standard, with different fault types and fault locations.