Corrosive Sulphur effect in power and distribution transformers failures and treatments

摘要

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.