How does an uneven electromagnetic field affect transformer oil?

The transformer is designed according to the principle of electromagnetic induction, and its signal moves along the direction of the magnetic induction line of the electromagnetic field. However, there are more and more household appliances in life, and more and more electricity is used. When using electricity, the electric wave Some related electrical signals will also interfere with the direction of the transformer's magnetic field, which will directly affect the direction of the transformer's movement. This is called the inhomogeneity of the transformer's magnetic field. It is most affected by temperature and will directly affect the transformer oil.
In the range of 60-80°C, the breakdown voltage of wet three-phase transformer oil may appear the maximum value. This is because when the temperature exceeds 80°C, the vaporization of water in the oil increases, the solubility of the oil increases, the possibility of suspended water is small, the water is basically in a dissolved state, and the dissolved water has little effect on the breakdown voltage of the oil, while When the temperature is lower than 60°C, there is more water in the suspended state in the oil. Therefore, when testing three-phase transformer oil samples, it should be carried out at room temperature, and when heating the filter oil, the oil temperature should not exceed 60°C.
When the purity of the transformer oil is high, improving the uniformity of the electric field can significantly increase the power frequency breakdown voltage, but in poor quality oil, the accumulation and arrangement of impurities have distorted the electric field, and the uniformity of the electric field has caused The benefits are not significant. When the impurity-containing oil is subjected to the impact voltage, because the impurities have no time to form a small bridge, improving the uniformity of the electric field can also increase its breakdown voltage.
There are many unstable phenomena in transformer oil, especially the nature of transformer oil itself determines that it is relatively volatile and unstable. In addition, transformer factories cut corners and falsified materials to make the quality of transformer oil even less guaranteed. We still have to be cautious. Treat transformer oil.