Medição de Emissões Acústicas Provenientes de Descargas Parciais em Sistema Ponta-Plano e Correlação com o Método Elétrico

Abstract

The evaluation of the operating condition of medium and high voltage equipment based on diagnosis of Partial Discharges (PDs), obtained from the measurement of ultrasonic acoustic emissions, has been the object of analysis of many works available in the technical literature. In this sense, this work presents a practical investigation of the occurrence of PDs, detected through acoustic and electrical methods, in a point-flat system subjected to different voltage levels, gaps and environmental conditions. This methodology is adopted to correlate the measured data with the acoustic (unconventional) and electrical (conventional) methods, in order to demonstrate the effectiveness of the former and contribute to obtaining diagnoses with high precision and reliability. The occurrence of PDs signatures, in the time domain for the acoustic and electrical methods, were obtained for the scenarios under analysis, both indicating, with good approximation, the incidence of the phenomenon. The analysis in the frequency domain of the results acquired with the acoustic method also corroborated the diagnosis of PDs in the evaluated scenarios.