The system UVM-R-0.7 serves for full regeneration and improving of transformer oil’s acid number by means of adsorbent of electrical insulating oil, viscosity of which does not exceed 70 cSt at temperature 50癈. The system restores oil to its virgin properties. The system is able to effectively remove contaminants such as acids and sludge from the oil as well as rectifying the color and restoring oxidation stability of the oil. The system is used while installation, repair and operation of oil-filled high-voltage equipment (power transformers, high-voltage switches etc.).