Continua l’impegno della Sea Marconi nei paesi medio-orientali. Proprio in questo momento (26 maggio 2009) è in corso un meeting organizzato da Saudi Electricity Company e GCC-Cigre – Technical Committee per approfondire la tematica dello zolfo corrosivo nelle grandi apparecchiature elettriche con fluidi isolanti. Questo tema è molto sentito nei paesi arabi, per questo motivo Sea Marconi è stata chiamata come esperta internazionale sulla materia e soprattutto come detentrice di contromisure realmente efficaci contro la presenza dei composti corrosivi dello zolfo.
Il meeting attualmente in corso vede come speaker Vander Tumiatti, il quale espone una presentazione dal titolo “Corrosion Phenomena in Power Transformers: Diagnosis and Countermeasures“. Di seguito i dettagli della dissertazione:
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.
