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.

　　因此变压器油的劣化判断仅仅靠耐压击穿试验是远远不够的，还应该经密度、粘度、闪光点、酸价、体积电阻率、含水量、油色及表面张力等测定，来判断变压器油的劣化程度，并及时采取相应措施。具体分析如下：

　　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、密度：变压器油密度一般在0.92以下，密度与温度有关，在20℃时为0.89，运行后与新油密度值比较，以确定变压器油的纯度。

　　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、闪光点：国家变压器油规定闪光点不低于135℃.油的闪光点越高，安全性也越好，但油内可燃气体增加时，闪光点会降低。

　　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、粘度：变压器油的品种不同，粘度也不同。我国规定，在50℃粘度不大于9.4×10-6m2/s。在75℃时粘度不大于5.5×10-6m2/s

　　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、酸价：国标变压器油规定 ，酸价不大于0.051mgKOH/g。当酸价小于等于0.2mgKOH/g时，几乎不可能产生油泥。在达到0.4mgKOH/g时就可能产生油泥。当超过0.4mgKOH/g油泥就会很多，应及时进行油处理或更换变压器油。

　　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、变压器油的绝缘耐压击穿：变压器油在耐压试验装置内绝缘间距为2.5mm，35kv以上设备其绝缘耐压击穿值为40kv，击穿电压值越高，变压器油绝缘性能越好。

　　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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