Digitalização e estudo de descargas parciais utilizando transformada wavelet discreta.

Abstract

Partial discharges are electrical discharges that partially bridges the insulation o f high voltage apparatus. I f their amplitudes are high, they may lead to insulation failures in some materials. Partial discharge measurements are nondestructive tests used for the evaluation o f the operating conditions o f high voltage equipments. I n this work, measurements were carried out by using a data acquisition system comprising a partial discharge detecting circuit, a commercial discharge detector and a digitizer. The partial discharges were analyzed by means o f the discrete wavelet transform method used to decompose and represent the partial discharge signals in their different resolutions. I t is shown that the proposed representation is a viable alternative to characterize partial discharge signals.