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Mineral transformer oil has been widely used in the power transformers due to its good insulating property and thermal conductivity. It is well-known that water molecules in the oil have detrimental effect on its conduction and breakdown strength and tend to cause accelerated aging of oil and paper insulation system. The relation of the total amount of water to the electrical properties of oil has...
The dielectric strength of transformer oil can be greatly improved by the modification of nanoparticles under AC, DC and positive impulse voltage, respectively. In comparison with the certain voltage, the combined voltage is more complicated and important for the safe operation of the converter transformer. However, the modification effect of nanoparticles on the breakdown characteristic of transformer...
The electric field distribution of the oil-pressboard structure under impulse voltage provides vital reference for the design of transformer insulation. The electric field distribution under impulse voltage is usually held equivalent to that of the capacitive field and calculated by simulation software. An appropriate margin to the calculation results is then selected according to the allowable strength...
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