Detecção e classificação de faltas em linhas de transmissão baseadas na transformada wavelet.

Abstract

This dissertation presents a method based on discrete wavelet transform for fault detection, clearing time identification and classification in transmission lines. The fault detection is accomplished by rules based on wavelet coefficients energy of the phase currents. The fault clearing time identification is carried out by wavelet coefficients analysis of the neutral and phase currents. The fault classification rules are based on wavelet coefficients energy of the neutral and phase currents obtained in fault clearing time. A fault is differentiated from power quality disturbances such as voltage sags and oscillatory transients. The method has been evaluated for real recordes obtained in various transmission lines of CHESF’s transmission system and good results were obtained.