Análise de modos e efeitos de falha aplicado a transformadores de potência

Abstract

This work presents a methodology that aims to provide technical-scientific support to expedite the decision-making regarding the actions of predictive maintenance reinforcements, renewal of power transformers, and extensions of the substation and its connections, propitiating a greater assertiveness of the investments by the concessionaires. The method is organized in three phases, which are subdivided into steps that constitute the activities to be performed. The first phase includes the use of the Failure Modes and Effects Analysis (FMEA) methodology applied to the transformer components, which is intended to define and identify potential system failures, as well as to provide values that will be used to determine the failure rate parameters In the next phase. The second phase corresponds to the use of FMEA applied to the transformer equipment, involving the evaluation of the impact of the loss to the electrical system. The last phase consists of a comparative analysis between the results obtained in the previous phases, with the aim of punctuating and ranking the transformers by their risk value for the system, in order to make possible the optimization of a maintenance schedule. The proposed method was applied to the transformers of the transmission concession area of the CEEE-GT from the analysis of the operation history and failures