Análise comparativa de métodos para religamento monopolar adaptativo de linhas de transmissão.

Abstract

The predominance of monopolar fault occurrences in transmission lines highlights that the utilization of methods that can identify the fault nature, mitigate the problem as fast as possible and cause less impact in the power system are necessary. To fulfill such premises, the Adaptative Single-Pole Auto Reclosing maneuver is an alternative to tripolar and monopolar protection with fixed dead time. This work initially presents a brief discussion about the existing solutions to the exposed problem and a comparative discussion of obtained results for different Adaptative Single-pole Auto Reclosing methods. This study proves to be important because it allows ascertaining different techniques that are addressed to enable systems protection. For this purpose, the chosen base methods, necessary alterations and used procedures are made explicit. The adopted methodology includes the implementation of Windowed Discrete Fourier Transform based routines to harmonic evaluation, filters, sampling rate variation and phasor estimation algorithms applied in transmission line signals with reactive compensation. After the exposure and discussion of the obtained results, comparison parameters between methods are defined, demonstrating which one was most successful in the tested applications. To evaluate the methods, real signals from monophasic faults occurrences in transmission lines were used.