Navegando por Autor "SANTOS, Renato Lélio da Silva"

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    Estudio de la influencia del ciclo de arranques y paradas en el estator de generadores síncronicos
    (INSTITUTO DE TECNOLOGIA, 2013) SANTOS, Renato Lélio da Silva; OLIVEIRA, Roberto Célio Limão de; LEITE, Jandecy Cabral; AZEVEDO, Manoel Socorro Santos; ESTEVES, Anderson Fernandes; MACIEL, Paulo Henrique de Lima; MAGALHÃES, Edilson Marques
    Synchronous generators undergo frequent start-stop cycles due to maintenance or external factors, causing thermal variations that affect stator insulation. This study, conducted at the Balbina hydroelectric plant in Amazonas, Brazil, examines insulation aging trends in stators through partial discharge testing. Results indicate that continuous operation increases the generators’ lifespan.
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    O Estudo da Influência do Ciclo de Partidas e Paradas no Estator de Geradores Síncronos
    (Universidade Federal do Pará, 2011) SANTOS, Renato Lélio da Silva; OLIVEIRA, Roberto Célio Limão de
    Synchronous generators are subjected to different stop situations, such as forced shutdowns, shutdowns due to external conditions, and scheduled shutdowns for corrective and preventive maintenance. The temperature variations to which the synchronous generator is subjected, especially in the stator, affect its insulation, which does not keep up with these constant changes due to different expansion coefficients. This work seeks to identify a trend in the progression of aging of the insulation of stator windings in machines that undergo repetitive starts and stops and remain with their reserve power off for many hours. The study was applied to the five synchronous generators of the Balbina hydroelectric plant, belonging to the Eletrobrás group, which presents this problem. This study confirms the partial discharge analysis tests of synchronous generators carried out periodically to diagnose problems in their stator windings that present different magnitudes and confirms the hypothesis that machines that present higher magnitudes of partial discharges in their stators are those that undergo more amounts of starts and stops and hours with reserve power off.