1. Working principle:

The core principle of the vacuum insulating oil purifier is the three-stage collaborative treatment of "vacuum dehydration, pressure filtration, adsorption and regeneration". First, the insulating oil to be treated enters the vacuum separation tank through the oil inlet pump - the vacuum level of -0.08~-0.095MPa is maintained in the tank (equivalent to a low-pressure environment above 3000 meters above sea level), and the dissolved moisture (about 100-300ppm) and dissolved gas (such as oxygen and nitrogen) in the oil are rapidly vaporized at low pressure to form oil-water-gas mixed steam; Subsequently, the steam is cooled to 40-60°C through the condenser (high-efficiency spiral tube or plate heat exchanger), the water condenses into liquid water and is discharged by the drain valve, and the gas is pumped out of the system by a vacuum pump to achieve oil degassing and dehydration (final moisture content ≤5ppm, gas content ≤0.1%). The second stage is pressure filtration, where the degassed oil enters the multi-stage filter element (such as 5-3μm polymer fiber filter media or stainless steel metal mesh) to intercept mechanical impurities (such as metal particles, fibers), colloids and oxidation products, and improves the cleanliness of the oil to NAS level 4-6 (ISO 4406 standard) to ensure that the insulating oil does not block the oil circuit or electrode gap. The third stage is adsorption regeneration (optional module), which deeply adsorbs acidic substances (such as carboxylic acids), trace water residues and polar impurities in the oil by filling activated alumina, zeolite or ion exchange resin, and restores the oxidation resistance and dielectric strength of the oil (≥ 60kV/2.5mm).

2. Core technological innovation:

While traditional Vacuum Oil Purifier rely only on pressure filtration and are difficult to handle emulsified water and dissolved gases, modern insulating oil vacuum purifiers achieve a leap in performance through three major technological innovations:

1. High-efficiency vacuum system: using roots pump + water ring pump series or dry screw vacuum pump, the vacuum degree is increased by more than 30% compared with the traditional equipment, the dehydration efficiency is increased by 50%, and the moisture in the oil can be reduced from 200ppm to less than 10ppm within 30 minutes;

2. Intelligent control technology: integrated online oil quality sensors (such as moisture detector, particle counter, dielectric strength tester), real-time feedback of oil parameters and automatically adjust the vacuum degree, heating temperature (usually 60-80°C) and filtration flow rate to avoid overheating oxidation or under temperature dehydration;

3. Material and structure optimization: The filter element adopts a gradient pore size design (coarse filtration on the outer layer to block large particles, and fine filtration on the inner layer to remove particles), with anti-aging sealing ring and high-temperature resistant stainless steel tank (temperature resistance ≤ 120°C), extending the life of the equipment to more than 10 years; Some models are also equipped with oil regeneration units to repair aging insulating oil through chemical adsorption or ionization technology.