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The behaviour of transformer oil and other fluids used for the cooling and insulation of power system equipment is significantly influenced by enforced motion. Not only can charges generated by streaming electrification1 accumulate to prejudice dielectric integrity, but the dielectric strength of the fluid is also altered per se2 by the actions of the flow in a complex, but predictable, manner. Both...
Dielectric liquids subjected to enforced motion in narrow ducts exhibit anomalous but reproducible breakdown behavior[1]. Furthermore the velocity dependent dielectric integrity of such an arrangement is characteristically different for sustained and impulse electric stress[2-4]. The physical mechanisms responsible for electrical breakdown in these circumstances are complex since it is known that...
It has been established that dielectric liquids under sustained electric stress are set into electrohydrodynamic (EHD) motion. This results from the interaction between the electric field and space charge in the liquid. The patterns of such motion for parallel electrode geometry [1 5] reveal the existence of EHD instabilities at intermediate voltages. The variations of break down statistical parameters,...
It has been established by a number of investigators [1]–[4] that the statistics of breakdown of liquid dielectrics change with forced liquid motion. More specifically, the distribution of liquid breakdown voltage shifts with increasing velocity from the extreme value distribution that characterizes stationary fluids to a Gaussian distribution [2],[3]. This is quite significant from the practical...
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