The core principle of the Transformer Oil Filtration Machine is the three-stage collaborative process of "vacuum dehydration + pressure filtration + adsorption regeneration." First, the insulation oil to be processed is pumped into the vacuum separation tank — the tank maintains a vacuum of -0.08 to -0.095 MPa (equivalent to a low-pressure environment above 3000 meters in altitude). Water dissolved in the oil (about 100-300 ppm) and dissolved gases (such as oxygen and nitrogen) quickly vaporize under low pressure, forming an oil-water-gas mixed vapor. The vapor then passes through a condenser (high-efficiency spiral tube or plate heat exchanger) and cools to 40-60°C. The moisture condenses into liquid water and is discharged through a drain valve, while the gas is removed by the vacuum pump system, achieving degassing and dehydration of the oil (final water content ≤ 5 ppm, gas content ≤ 0.1%). The second stage is pressure filtration. The degassed oil is passed through multi-stage filter elements (such as 5-3 μm polymer fiber filters or stainless steel mesh) to capture mechanical impurities (such as metal particles and fibers), gums, and oxidation products, raising the oil cleanliness to NAS 4-6 level (ISO 4406 standard), ensuring no particle blockage in oil channels or between electrodes. The third stage is adsorption regeneration (optional module), which uses activated alumina, molecular sieves, or ion exchange resins to deeply adsorb acidic substances (e.g., carboxylic acids), trace moisture residues, and polar impurities in the oil, restoring its antioxidant properties and dielectric strength (≥60 kV/2.5 mm).

The High Vacuum Transformer Oil Degassing Machine achieve performance breakthroughs through three major technological innovations:

1. Efficient Vacuum System: Using a combination of Roots pump + water ring pump in series or a dry screw vacuum pump, the vacuum level is improved by over 30% compared to traditional devices, and dehydration efficiency is increased by 50%. The moisture content in the oil can be reduced from 200 ppm to below 10 ppm within 30 minutes.

2. Intelligent Control Technology: Integrated online oil quality sensors (such as moisture detectors, particle counters, and dielectric strength testers) provide real-time feedback on oil parameters and automatically adjust vacuum level, heating temperature (usually 60-80°C), and filtration flow rate, preventing overheating oxidation or insufficient dehydration.