As an important medium for transformer insulation and cooling, the quality of transformer oil is directly related to the safe and stable operation of the transformer, but the oil deterioration or deterioration caused by various reasons will threaten the safe operation of the transformer.
Therefore, it is not enough to judge the deterioration of transformer oil only by pressure resistance test. It should be measured by density, viscosity, flash point, acid value, volume resistivity, water content, oil color and surface tension, to judge the deterioration of transformer oil and take appropriate measures in time. The specific analysis is as follows:
1, density: the density of the transformer oil is generally below 0.92, the density is related to the temperature, and it is 0.89 at 20 C. After running, it is compared with the new oil density to determine the purity of the transformer oil.
2, flash point: the national transformer oil flash point is not less than 135 degrees. The higher the flash point of the oil, the better the better, but when the fuel gas increases, the flash point will be reduced.
3, viscosity: the varieties of transformer oil are different, and the viscosity is also different. In China, the viscosity is less than 9.4 * 10-6m2/s at 50 C. At 75 C, the viscosity is not more than 5.5 x 10-6m2/s
4, price: the requirements of transformer oil, the acid value is less than 0.051mgKOH/g. When the acid value is less than or equal to 0.2mgKOH/g, almost could not produce sludge. Oil sludge may be produced when 0.4mgKOH/g is reached. When the sludge is over 0.4mgKOH/g, there will be a lot of oil sludge, so oil treatment or replacement of transformer oil should be done in time.
5, the insulation and withstand voltage breakdown of transformer oil: the insulation distance of transformer oil in the pressure test device is 2.5mm, the insulation resistance of the equipment above 35kV is 40kV, the higher the breakdown voltage value, the better the insulation performance of transformer oil.
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