3.1.3. Step C: Brainstorming Actions to Close the Gaps

The main gap in the current maintenance strategy is the shortcoming in detecting faults in the initial stage during the transformers' useful life to prevent failures. In this context, the interpretation and evaluation of the analysis results are currently based on the standard guidelines that recommends corrective action when the measured value of a measurable variable exceeds its caution limit. For example, standard guideline IEC 60422 [15] recommends starting corrective action such as oil regeneration or oil replacement as soon as the acidity value, which is considered the indication key of oxidation deposits on the windings, exceeds its caution limit. However, this corrective action can be no more useful to solve the issue early because the deposits may have already, partially or entirely, formed. Another gap is the lack of the maintenance team's competence in the implementation of sustainable maintenance. Accordingly, a list of possible actions can be indicated to close most of the mentioned gaps. The suggested possible actions in order to comply with the sustainability principles and to approach the vision are:

