MARINELLI FILHO, Nelson2025-10-172025PIMENTEL, Eduardo Fernandes. Análise técnica da manutenção preventiva em subestações: foco em transformadores, disjuntores e chaves seccionadoras. 2025. 103 f. Dissertação (Mestrado em Engenharia, Gestão de Processos, Sistemas e Ambiental) – Instituto de Tecnologia e Educação Galileo da Amazônia – ITEGAM, Manaus, 2025.https://rigalileo.itegam.org.br/handle/123456789/1218This dissertation presents a technical analysis of preventive maintenance in substations, focusing on transformers, circuit breakers, and disconnect switches. Substations, essential for power transmission and distribution, are exposed to continuous operation under adverse conditions, leading to potential wear and failures. The study, of an applied and technical nature, is based on ABNT standards, manufacturers' manuals, and best practices from the electrical sector. The results demonstrate that preventive maintenance reduces failures, increases reliability, and extends equipment lifespan, serving as a strategic investment for the safety and efficiency of substations.pdf.Manutenção preventivaSubestações elétricasTransformadoresDisjuntoresChaves seccionadorasDissertaçãoEngenharia da produção