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Particle deposition occurs very rapidly and it modifies significantly the breakdown voltage and the metals content of transformer oil. This leads to unrealistic values not representative of the oil's condition in the transformer. It has been shown that particles in oil homogenization can be successfully achieved by 25 min of ultrasonic agitation for a I-liter volume of oil. This simple, rapid and...
Series of experiments have shown that when liquid flows over the surface of solid body, both the liquid and the solid body become electrified, mainly because of friction. The quantity of charge and its polarity depends on mutual induction of the two bodies, also on their dielectrical previousness.
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