Abstract-This paper presents a proposed solution using fuzzy approach, to assist the process of scheduling inspections in high power transformers (500KV), through the analysis of dissolved gases in the insulating oil, obtained using the technique of gas chromatography, and physico-chemical analysis of the oil. The development of the method was based on the criteria of gas analysis referenced standards, the statistical analysis of data and the tacit knowledge of experts. Sought to produce a solution which combines the results of traditional methods already established in the technical literature with additional situations arising from the physical-chemical analysis of the oil and the knowledge of experts, in order to increase the efficiency of such equipment inspection procedure.