Flow electrification phenomena in paraffinic based transformer oil

The paper details, the effect of AC and DC energisation on the flow charging characteristics of paraffinic based transformer oil. The Couette device which simulates some of the practical configurations of a transformer, mainly the duct flow condition in the transformer was employed. Flow charging phenomena was quantified by evaluating variations in the charging current, voltage buildup and accumulated charge, under varying flow velocities and energisation. The results of the investigation revealed that the above parameters increased with flow velocity and energisation. However, it was observed that with DC energisation, the polarity of the parameters evaluated depended on the polarity of the applied voltage.