Corrosive Sulphur effect in power and distribution transformers failures and treatments

In the last years, many power and distribution transformers have a failure mode caused by corrosive Sulphur, partial discharges, explosion or gas generation with Kraft and oil degradation. The degradation process has been unexpected, and the degradation has been determinate by IEC Standards with the traditional analysis, however there are not an earlier recognition than traditional methods, of failure for the transformer diagnosis, with a recommendation for the corrective actions and a methodology to determine the effect before the failure happens. There are some papers for the asset aging, in this research, it is possible to determinate a real correlation and caused failure analysis by data mining, dissolved gas analysis (DGA), physical, chemistry and electrical test with the qualitative and quantitative analysis of the corrosive Sulphur in the transformers. This research has been developed and it has considered a failure mode caused analysis by corrosive Sulphur phenomenon, the problem was solved on 61 power and distribution transformers, and the novel contribution is a recommendation detection, corrective maintenance, different procedures with advantages and disadvantages the reparation and expected remaining life in the transformers, it will prevent an engineering failure on power and distribution transformers, for high and medium voltage.