Bernard Fernandes Kusel

Transmission lines little longer than half-wavelength have been studied as an alternative for power transmission over very long distances. Recent studies about fault location procedures have proved that most impedance-based techniques are not able to correctly identify the fault point in this kind of line. In this paper, the performance of a two-terminal traveling wave-based fault location approach applied to a transmission line little longer than half-wavelength is investigated through simulations in the Alternative Transients Program (ATP), from which several fault scenarios in a 1000 kV AC line 2600 km long are analyzed. The obtained results indicate traveling wave-based approaches are robust to the atypical operation features of half-wavelength power transmission lines, being suitable for fault location applications in this kind of line.

A novel phasor estimation algorithm is proposed, by means of an innovative modification of the traditional full cycle discrete Fourier transformer (FCDFT) algorithm. The main idea is to combine the FCDFT outputs for even and odd sample‐setsobtained for one cycle data window decimated by two and by four. Its performance was compared with the ones of other full cycle algorithms reported in the late literature on the subject. The obtained results reveal the proposed algorithm leads to the best performance, even considering both the decaying DC component of the fault current and the one caused by the current transformer secondary circuit.