What is the role of Transformer oil filtration?

Transformer oil, commonly known as transformer insulating oil, is also called electrical insulating oil. Its main functions are cooling and insulation, and it also has the effect of eliminating arcs generated when the circuit is cut off.

Under the influence of external impurities, contact with air and the high operating temperature of the equipment itself, the quality of transformer oil (insulating oil) may gradually deteriorate, so Transformer oil filtration is particularly important.

• What is the role of Transformer oil filtration?

• What is the whole process of Transformer oil filtration?

• Why pay attention to the acid value when carrying out Transformer oil filtration?

What is the role of Transformer oil filtration?

The purpose of Transformer oil filtration is to remove the moisture and impurities in the transformer oil, improve the electrical strength of the oil, protect the paper insulation in the oil, and also improve the physical and chemical properties of the oil to a certain extent.

Under the action of heat and electric field, the transformer oil is gradually oxidized to form various oxides, alcohols, aldehydes, acids, etc. in contact with oxygen, and finally insoluble colloids and sludge are formed. These acidic substances reduce the insulation performance of the transformer, so it is necessary to filter the transformer oil through the transformer oil filter, and also do the exhaust treatment. Because the gas will affect the insulating properties of the transformer insulating oil. Some filtration equipment also has the function of dehydration, and can also filter out the water in the middle.

What is the whole process of Transformer oil filtration?

When carrying out Transformer oil filtration, the water vapor discharged from the upper part of the vacuum separator is first cooled and dehumidified by the condenser, and then enters the cooler for cooling again, and the condensed water enters the water storage tank for discharge. Finally, it is discharged into the air by the vacuum pump.

The dry oil in the vacuum separator after vacuum vaporization and dehydration is raised from negative pressure to positive pressure by the oil transfer pump. After filtering, the clean oil is discharged from the oil outlet to complete the entire oil purification process.

Why pay attention to the acid value when carrying out Transformer oil filtration?

The acid value is the amount of acidic substances contained in the oil, and the number of milligrams of potassium hydroxide required to neutralize the acidic substances in 1 g of oil is called the acid value. The acid number includes both organic and inorganic acids contained in the oil, but in most cases the oil contains no inorganic acids. Therefore, the oleic acid value actually represents the amount of organic acids in the oil. The organic acid contained in the new oil is mainly cyclic acid. During storage and use, the organic acids generated by the oxidation of oil are fatty acids. For new oil, acid value is a sign of the degree of refinement, and for operating oil, it is a sign of the degree of aging of the oil, and it is one of the important indicators to determine whether the oil needs Transformer oil filtration.

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