COSTA JÚNIOR, Carlos Tavares da2025-03-072010https://rigalileo.itegam.org.br/handle/123456789/520This work emphasizes the importance of monitoring and diagnosing the quality of electric power from the viewpoint of harmonic distortion present in low-voltage three-phase electrical installations. The proposed methodology analyzes and diagnoses the level of harmonic disturbances by evaluating the total harmonic distortion (THD) indicator, supported by an expert system based on a Fuzzy inference system. The study presents a systematic approach to assessing power quality, using regulatory standards and recommendations, and demonstrates the effectiveness of Fuzzy logic in formulating precise and standardized diagnostics.Qualidade de EnergiaDistorção HarmônicaTHD (Total Harmonic Distortion)Lógica FuzzySistema de Inferência Fuzzypdf.Engenharia Elétrica, Sistemas de Energia, Elétrica, Controle e Automação, Qualidade de Energia, Inteligência Artificial