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De Carlo R.M.,University of Turin | Sarzanini C.,University of Turin | Bruzzoniti M.C.,University of Turin | Maina R.,Sea Marconi Technologies S.a.s. | Tumiatti V.,Sea Marconi Technologies S.a.s.
IEEE Transactions on Dielectrics and Electrical Insulation | Year: 2014

Copper-in-oil dissolution and copper-on-paper deposition may affect the insulation of oil-filled power transformers, shunt reactors and high voltage bushings. Dissolved copper increases the dielectric losses in oil, and copper deposition can dramatically increase insulating papers' conductivity. The available literature does not report researches where the mechanisms of dissolution of copper in oil and copper deposition on the surface of solid insulation (Kraft paper) have been elucidated. This study is aimed at the investigation of the tendency of some commercially available unused mineral oils of different compositions to dissolve copper and to deposit it in the cellulose phase. Different conditions of reaction, presence of oxidation inhibitor (of the hindered-phenols family), addition of triazole-type compound (used as corrosion inhibitor) and general oil properties were studied to investigate their influence on copper concentration in oil and onto paper after artificial aging in controlled conditions.

Maina R.,Sea Marconi Technologies S.a.s. | Tumiatti V.,Sea Marconi Technologies S.a.s. | Bruzzoniti M.C.,University of Turin | De Carlo R.M.,University of Turin | And 2 more authors.
Proceedings - IEEE International Conference on Dielectric Liquids | Year: 2011

Mineral oils may react with the copper conductors in oil impregnated transformers, leading both to the formation of dissolved and suspended copper in the oil and to the deposition of copper onto the paper surface of the solid insulation. Available standard methods for copper detection in mineral oil may not be fully effective in assessing the total copper content. Dissolved and suspended copper species in the oil are shown to affect oil's losses to a different extent. Unused oils are investigated to elucidate their tendency to dissolve copper in the oil and to deposit it onto the paper surface. Oils inherent properties, the presence of additives and the reaction conditions may significantly vary the magnitude of the copper dissolution, as well as the transfer of copper to the paper tapes. A tentative relationship between the deposited copper and the papers dielectric properties is described. © 2011 IEEE.

Vercelli M.,University of Turin | Gaino W.,University of Turin | Contartese V.,Green Has Italia s.p.a | Gallo L.,Green Has Italia s.p.a | And 4 more authors.
Acta Scientiarum Polonorum, Hortorum Cultus | Year: 2015

Iron deficiency is a major nutritional disorder in crops. Inorganic Fe-compounds and synthetic Fe-chelates are commonly used to control chlorosis but their use arise environmental concerns. We recently developed a new iron fertilizer using a β-cyclodextrin-based nanosponge complex (Fe-NS). In this study, a pilot trial was performed on hydroponically cultivated horticultural plants in order to evaluate the effect of Fe-NS. Sweet corn and tomato were used as model plants analyzing chlorophyll, dry matter and Fe content. Fe-NS effect was compared to FeSO4 and Fe-DTPA. Fe-NS had a positive effect on re-greening and growth in sweet corn and tomato plants. © Wydawnictwo Uniwersytetu Przyrodniczego w Lublinie, Lublin 2015.

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