In the production process of transformers and transformers, the main reasons for the pollution of insulating oil are as follows:
1 、 vacuum oil tank and insulating oil pipeline is not clean. In the production process, the transformer insulation oil is injected into the vacuum oil tank through a special oil pipeline. In the process of oil filling, the insulation oil adsorbed on the inner wall will be aged and deteriorated due to the influence of the heating and cooling temperature of the insulating oil. The inner walls may become unclean by dirt and moisture in the air.
2, transformers, transformers, tanks, oil storage cabinets and porcelain sets are not clean inside, or no drying, when the insulating oil into the transformer and transformer internal, it was contaminated.
3, in the process of vacuum oiling, the water in the transformer and transformer body is not completely removed in the vacuum heating process, and has not achieved the desired results. Transformer, instrument transformer body is not clean, insulating oil pollution.
4, transformers, transformers, transformers, such as rust and other small debris is not cleared, insulating oil pollution. This is a very important reason for the pollution of insulating oil. Today's oil immersed power transformers, transformers are laminated core, the core directly with the insulation oil contact, the core of the dirt is very easy to be brought to the insulating oil.
Basic parameters of hydraulic oil
Appearance (color), oil color, often can reflect the degree of refinement and stability. For base oil, the higher the general refining degree is, the more clear the hydrocarbon oxides and sulfides are removed and the lighter the color is.
Viscosity reflects the internal friction of oil, which is an indicator of oil content and liquidity. Under the premise of no additional functional additives, the greater the viscosity, the higher the oil film strength, the worse the liquidity.
A viscosity index indicates the extent to which oil viscosity varies with temperature. The higher the viscosity index, the lower the viscosity of the oil is affected by the temperature, the better the viscosity temperature performance, the worse the contrary.
Flash point is an indicator of evaporation of an oil product. The lighter the fraction of oil, the greater the evaporation, and the lower the flash point. On the contrary, the heavier the fraction of oil, the smaller the evaporation, the higher the flash point.
Point refers to the highest temperature in the cooling conditions prescribed under the oil to stop the flow of the. The solidification of oil products is very different from the solidification of pure compounds. The oil does not have a definite freezing temperature. The so-called "coagulation" is simply a loss of fluidity as a whole, and not all components become solid. High pour point oil can not be used at low temperature. On the contrary, in the area of high temperature is not necessary to use low pour point oil.
Acid value, base value and neutralization value, acid value are indicators that indicate that the lubricating oil contains acidic substances, and the unit is mgKOH/g.