The breakdown field of pure oil is very high. When there are impurities and moisture in the oil, the breakdown voltage of the oil drops obviously. There are a lot of insulating materials in the transformer, and the oil contains fiber impurities, in which the fiber containing water is more conductive.
Reducing the water content of oil plays an important role in improving the operation safety of the transformer and slowing down the aging of oil. In order to reduce the water content of the oil, vacuum heating can be used to treat the oil. The oil temperature is heated to 60~70 degrees, and the high vacuum is pumped to reduce the water content in the oil.
The gas content is one of the main control indexes of transformer oil, and the gas content directly affects the insulation performance of the ultra high voltage transformer. The oil content of the transformer oil in operation is best not more than 4%, and the gas content of 500kV transformer oil is controlled within 0.5%. Transformers above grade 60kV require static discharge before vacuum injection and finished products test. The purpose is to eliminate bubbles in the transformer body and oil and prevent bubble discharge during product test.
Improving the uniformity of the electric field can obviously improve the power frequency breakdown voltage of the high quality transformer oil. As for the oil containing impurities, the impurity can not form a "small bridge" under the impact voltage, and the degree of pressure resistance of the oil can be improved by improving the uniformity of the electric field.
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