Identificação de Padrões de Contaminação Por Umidade em Óleo de Transformador Usando Descargas Parciais Como Fontes de Sinais
DOI:
https://doi.org/10.18618/REP.20113.249255Keywords:
Análise de Componentes Principais, Descargas Parciais, Emissão Acústica, Transformada Wavelet, Transformadores de Potência, UmidadeAbstract
Este artigo propõe uma nova técnica de detecção de contaminação por umidade em óleo isolante usando os sinais acústicos das descargas parciais (DP). Para demonstrá-la, um experimento é montado com um sensor piezoelétrico fixado na base de um reservatório que é preenchido com amostras de óleo isolante contaminadas com diferentes níveis de umidade. Um dispositivo gerador de descargas elétricas fica submerso no óleo para simular ocorrências de descargas parciais. Os sinais acústicos detectados são processados usando a Transformada Wavelet Discreta para extrair características de tempo e freqüência. Em seguida, é feito um processamento usando a Análise de Componentes Principais (PCA) de modo a identificar padrões de contaminação por água no óleo de transformador. Os resultados mostram que a técnica é promissora para o desenvolvimento de um sistema de monitoramento on-line de transformadores de potência.
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