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Electrification of mineral oil and pressboard during power transformers operation may lead to high energy electrical discharges and finally, to the transformers failures. This paper presents the results of a study concerning the influence of pressboard roughness and ageing condition on the mineral oil electrification. The experiments were performed on unaged and thermally aged (1000 h at T = 135 °C)...
The static electrification phenomenon is a result of the mineral oil flow through the solid insulating components and cooling ducts. The contact of streaming high resistivity mineral oil with the solid surface of the paper insulation generates electrical charge accumulation, which can produce electrical discharge that affects the insulation system properties. Many experimental results indicate that...
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