Research on Transformer Oil Breakdown Voltage Detection Method Based on Digital Images

The breakdown voltage of transformer oil is an important indicator reflecting its insulation performance, and can only be measured through destructive tests at present. This article proposes a non-destructive method using digital images to measure the breakdown voltage of transformer oil. Firstly, a semiconductor laser with a wavelength of 632nm is used to excite the scattering phenomenon in transformer oil. The image information is filtered through image cutting and filtering. Finally, the number of pixels is selected as an indicator of light intensity to establish a relationship between it and the breakdown voltage of transformer oil. Research has found that the stronger the scattered light intensity, the higher the concentration of impurities in transformer oil. Under the action of an electric field, impurity channels are more likely to form and lead to breakdown of transformer oil. The breakdown intensity of transformer oil has a good negative correlation with the brightness of scattered light intensity, and the breakdown voltage of transformer oil can be calculated using formulas. The method proposed in this article can achieve non-destructive measurement of transformer oil breakdown voltage, which has certain engineering significance.