Performance requirements of box - type transformer oil

Box-type transformer oil is a mixture of hydrocarbon compounds, transformer oil properties of the transformer oil has a greater impact on the function. To ensure the normal functioning of the pad mounted transformers oil, the step voltage regulators of transformer oil usually have the following requirements: 1. Density as small as possible in order to facilitate the precipitation of oil in water and impurities. 2. Viscosity should be moderate, too much will affect the convection cooling, too small will reduce the flash point. 3. Flash point should be as high as possible, generally should not be less than 135 ℃. 4. The freezing point should be as low as possible. 5. Acid, alkali, sulfur, ash and other impurities in the lower the better, to try to avoid their insulating materials, wires, tanks and other corrosion. 6. The degree of oxidation can not be too high. The degree of oxidation is usually expressed in terms of acid value, which is the amount of potassium hydroxide (mg) required to absorb the free acid in 1 gram of oil. 7. Stability should not be too low, the stability of the acid value of the test is usually expressed in the sediment, which represents the ability of anti-aging oil.