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According to our previous experiment, oil flow electrification is closely related to the space charge behaviors in oil-paper insulation system under DC voltage. In this paper, we present a new numerical method to estimate the streaming current in a rectangular paper duct under DC voltage. For the simulation model, we consider the case of laminar flow in a sample of two layers of oil-impregnated-paper...
In order to study the effect of space charge on oil flow electrification under DC voltage, an experimental model with plane electrode was designed. A closed oil circulating system was built to simulate the oil path between the windings inside a converter transformer. The results reveal that polarity of streaming current depends on the sample configuration. If the high voltage electrode was covered,...
Due to the properties of biodegradability and high fire temperature, ester fluids are becoming potential substitutes to mineral oil for power transformers. Laboratory based DGA (dissolved gas analysis) techniques and the online DGA devices have been widely used on mineral oil filled transformers to diagnose faults. It is therefore of importance to understand how these techniques and devices perform...
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