The engagement of Sea Marconi in the Middle East continues. Right now (26th May 2009) a meeting organised by Saudi Electricity Company and GCC-Cigre – Technical Committee is in progress to deepen the topic of corrosive sulfur in large electrical equipment with insulating fluids. This topic is very sensitive in Arab Countries, for this reason Sea Marconi has been called as an International expert on this matter and, most of all, as holder of really effective countermeasures against the presence of sulfur corrosive compounds.
The meeting, currently in progress, has Vander Tumiatti as speaker, proposing a presentation titled “Corrosion Phenomena in Power Transformers: Diagnosis and Countermeasures“. Details on the dissertation are provide here below:
Abstract:
This paper describes some corrosion phenomena involving copper, insulating oil and solid insulation of oil-immersed transformers and reactors. The paper reports evidences of presence, occurrence and effects of dibenzydisulfide (DBDS) and other corrosive sulfur compounds in insulating mineral oil. Both copper sulfide deposition and dissolved copper formation are investigated, giving evidences derived both from field experience and laboratory tests. A new diagnostic method, called Total Corrosive Sulfur, to quantitatively detect the presence of corrosive compounds in the oil is described.
The available techniques for diagnostic of corrosion phenomena and evaluation of the tendency of the oil to form conductive deposits are described. A review of the available mitigation techniques to reduce the effects of corrosion phenomena is here reported, with regards to their effectiveness. The removal of corrosive compounds or dissolved copper by mean of on-load and off-load selective depolarization is compared with other mitigation techniques.
Keywords:
Dibenzyldisulfide, DBDS, corrosive sulfur, copper sulfide, dissolved copper.
