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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...
The insulating performance of the liquid dielectric plays an important role in the operation of the transformer. It has been verified by numbers of fault cases occurred in the release testing on transformers, that flashovers and breakdowns of insulating pressboard occurred in the angle rings, shielding rings and outlet device frequently, while an impulse routine test was processing. Study on the distribution...
The valve winding in the converter transformer withstands several types of voltage, including the AC, DC, and the combined AC-DC voltage. It is important to consider the effects of voltage type to the electric field distribution. In this paper, a combined AC-DC source was constructed. The electric field distribution of oil paper insulation model was measured by Kerr electro-optic effect, under combined...
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