In order to increase the substation's transformation capacity, Furnas substation in the city of Campinas, received a new bank of 345/138/13.8 kV, 150 MVA, single-phase autotransformers with on load shunt tap-changers comprised of two phases manufactured by Jeumont/Vatech (France) in 2001 and one phase by ASEA in 1975. Moving with the general trend of migration from preventive to predictive maintenance, the Jeumont transformers were specified by Furnas, using a contract amendment, for delivery already equipped with sensors and on-line monitoring systems. This scope also included the modernization of the ASEA phase by installing sensors for monitoring and substitution of electromechanical devices with intelligent electronic devices (IEDs). The benifits achieved by operating with this on-line monitoring system in the field will be shown, including the finding of a defect in one of the phases of the bank during the period when the system was being installed, with a part of the data capture system already in operation. We will also show how the readings obtained in the implementation phase helped in investigating the causes for the occurrence.
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