Influence of Thin Layer Deposits and Temperature on Static Electrification Phenomena of Transformer Oils
Résumé
The static electrification phenomenon is studied versus the temperature and the properties of the solid/liquid interface. The investigations are achieved on a test cell with a rotating metallic disk coated on both sides with thin layers issued from three kinds of materials (aluminium, silicon and polytetrafluoroethylene (Teflon)). It is shown that the current characterising the static electrification increases with temperature and rotating velocity. The currents measured with aged oil are higher than that with fresh oil. For a disk coated with pure aluminium, all measured currents are negative with fresh oil and positive with aged oil. For a disk coated with silicon or polytetrafluoroethylene, changes of the currents polarity have been observed.
Domaines
Energie électrique
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