In electric power systems, the shunt reactors are the equipment responsible for the reduction or even cancellation of undesirable capacitive effects in the operation of the lines. Then one realizes the importance of such equipment and the need to keep them running smoothly. A major fault generates a high cost of corrective maintenance, drop in performance indicators, in addition to fines by the regulator - Agência Nacional de Energia Elétrica - ANEEL.The life cycle of a shunt reactor involves eight steps - Planning, Specification, Procurement, Fabrication, Installation, Commissioning, Operation and Decommissioning. In this work will be addressed aspects only of the management of the exploration phase, which includes the set of processes and operation maintained according to the perspectives of the company where this study was conducted. The aging of the reactor can occur in various ways, however the lifetime of a reactor is mainly conditioned by two factors: the speed of aging and loss of robustness of its materials and components, and the operating conditions imposed on it over time. To avoid damage to the reactors, the electric companies have adopted procedures for preventive and predictive maintenance, which, when based on diagnoses of different evaluation methods have a fundamental impact on the life and reliability of the reactors. As a condition of degradation of a reactor is a continuous process in time, this can be classified into five stages: new, normal, abnormal, defective and failed. A condition index (CI) can be attributed to each of these stages of degradation, according to results of diagnostic tests to analyze the state of reactor operation and estimation of its current position in relation to its life cycle. This dissertation deals with the development of a methodology for the systematic analysis by combining fourteen different diagnostic methods and map the results to a model of condition that guide the life cycle of the reactor. The methodology was applied in ten reactors of 500 kV in two Eletrobras-Eletronorte substations in Transmission System of Pará, company where this study was conducted.
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