How does the oil filter filter insulating oil?

The process of oil filter to filter insulating oil mainly removes impurities, moisture, gas and other pollutants in the oil by physical and chemical methods, thereby restoring or improving the insulation performance of the oil. The following are the main steps and principles of oil filter to filter insulating oil:

1. Pretreatment

- Purpose: Remove large particles of impurities and some moisture.

- Method: Use a coarse filter or sedimentation tank for preliminary filtration.

2. Heating

- Purpose: Reduce the viscosity of the oil, improve fluidity, and facilitate filtration.

- Method: Heat the oil to a certain temperature (usually 50-70℃) through a heating system.

3. Vacuum degassing

- Purpose: Remove dissolved gas and moisture in the oil.

- Method: Introduce the oil into a vacuum tank. Under vacuum conditions, gas and moisture escape from the oil and are pumped out by a vacuum pump.

4. Fine filtration

- Purpose: Remove tiny particles and colloidal substances.

- Method: Use a multi-layer filter element or filter paper for fine filtration. The pore size of the filter element is usually 1-5 microns.

5. Adsorption treatment

- Purpose: To remove acidic substances, oxides and other chemical pollutants from the oil.

- Method: Use adsorbents (such as activated alumina, silica gel, molecular sieves, etc.) for adsorption treatment.

6. Cooling

- Purpose: To reduce the oil temperature and prevent overheating.

- Method: Cool the oil to a suitable temperature through the cooling system.

7. Post-treatment

- Purpose: To further remove residual impurities and moisture.

- Method: Use a high-efficiency filter or centrifuge for final filtration.

8. Monitoring and analysis

- Purpose: To ensure that the filtered oil meets the use standards.

- Method: Use analytical instruments to detect the cleanliness, moisture content, gas content and electrical properties of the oil.

Main components of the oil filter:

1. Heating system: used to heat the oil and reduce viscosity.

2. Vacuum system: used for degassing and dehydration.

3. Filtration system: includes coarse filters and fine filters to remove particulate impurities.

4. Adsorption system: used to remove chemical pollutants.

5. Cooling system: used to cool the treated oil.

6. Control system: used to monitor and adjust the entire filtering process.

7. Oil storage tank: used to store the oil to be treated and the treated oil.

Filtering effect:

- Cleanliness: remove solid particles in the oil and improve the cleanliness of the oil.

- Moisture content: reduce the moisture content in the oil and improve the insulation performance.

- Gas content: remove dissolved gas and prevent bubble formation.

- Chemical stability: remove acidic substances and oxides to extend the service life of the oil.

Through the above steps, the oil filter can effectively filter the insulating oil, restore its insulation performance, and ensure the safe operation of the transformer.