Engenharia Elétrica
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Navegando Engenharia Elétrica por Autor "Borges, Luiz Antônio Campos"
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Monografia Acesso aberto Diagnóstico do estado da isolação dos enrolamentos estatóricos de geradores síncronos por meio da análise das descargas parciais(2018) Borges, Luiz Antônio CamposIn view of the relevance of synchronous generators, the Brazilian electric system for the generation of electric energy and consumption service that is growing in the country, provided by economic development, it becomes vital to use maintenance techniques that reduce the failures and increase the availability of the generation of these equipments, since most of the occurrences of failure registered in synchronous machines happens due to anomalies in the isolation of the stator windings. These anomalies can be detected in advance by monitoring the partial discharges that occur in the insulation system of the windings. This document presents the peculiarities related to the partial discharges with the objective of diagnosing the degradation in the isolation of the stator windings. In order to reach this goal, we first carried out an analysis of the existing literature, presenting basic concepts about synchronous generators and their constructive characteristics, highlighting the isolation of stator windings. Then, the relevant factors that lead to the formation of partial discharges, the monitoring techniques and measurement system of this phenomenon will be presented. We also analyzed the statistical and interpreted graphs of the partial discharges data and finally a case study applied in the one generating unit of the Jaguara hydroelectric plant. After these analyzes as a result of the situation of the insulation system of this unit the study concluded that the level of degradation of the system is in stability even when compared with data of the manufacturer.