A transformer oil purifier (also called transformer oil filtration machine) is a specialized piece of equipment designed to purify and regenerate the insulating oil inside power transformers. Its core function is to remove contaminants from the oil and restore its physical and electrical properties, thereby ensuring the safe and stable operation of the transformer.
Key Functions of Transformer Oil Purifier
Contaminant Removal
Water removal: Free water and dissolved water in the oil are the main factors that reduce the oil's dielectric strength. The purifier uses technologies like vacuum dehydration, coalescence separation, and adsorption to eliminate water.
Particle removal: Solid impurities (e.g., metal particles, dust, insulation debris) are filtered out through precision filter elements to prevent abrasion of transformer internal components and insulation damage.
Gas removal: Dissolved gases (e.g., air, methane, hydrogen) are extracted via vacuum degassing, which avoids partial discharge and oil aging caused by gas bubbles.
Oil Regeneration (for aging oil)Advanced oil purifiers are equipped with regeneration systems (e.g., using silica gel or activated clay adsorbents) to remove acidic substances, sludge, and oxidized by-products from aged oil. This restores the oil's acidity value, dielectric strength, and viscosity, extending the oil's service life and reducing the need for oil replacement.
Core Working Principles
The operation of a transformer oil purifier typically combines vacuum technology, filtration technology, and adsorption technology:
The transformer oil is pumped into the purifier system.
Large solid particles are removed through primary filtration.
The oil enters a vacuum chamber, where low pressure causes water and gas to vaporize and be discharged, achieving dehydration and degassing.
Fine filtration removes micro-particles, and the optional regeneration unit adsorbs aging products.
The purified oil is pumped back into the transformer.
Significance in Transformer Operation
Maintains the oil's high dielectric strength, preventing insulation breakdown and transformer faults.
Reduces the rate of oil oxidation, extending the service life of both the oil and the transformer.
Improves heat dissipation efficiency of the transformer (contaminants can hinder heat transfer).
Lowers maintenance costs by reducing the frequency of oil replacement and transformer downtime.