Transformer oil absorbs moisture from air through breather desiccant saturation, gasket leakage, and paper insulation degradation. Moisture above 10 ppm accelerates cellulose ageing. Double stage vacuum purification achieves dissolved water below 5 ppm through sequential low-vacuum and high-vacuum stages.
Two-Stage Vacuum Process
First stage operates at 50-100 mbar to remove bulk free water and light dissolved gases. Heated oil (50-70°C) is sprayed or cascaded as thin film over structured packing, maximizing surface area for mass transfer. Second stage pulls to below 1 mbar, where water’s boiling point drops below 10°C—flash evaporation removes the last 5-10 ppm of dissolved moisture.
Vacuum Pump Selection
Vacuum pump selection is critical: rotary vane pumps achieve 0.5 mbar ultimate pressure; Roots blower booster combinations reach 0.001 mbar for ultra-dry oil specifications. Gas ballast prevents water condensation in pump oil.
Equipment
The Double Stage Purifier achieves <5 ppm moisture. The Oil Regeneration System restores aged oil. Oil Testing verifies dryness. The Oil Filter Press provides pre-filtration. The Hydraulic Oil Filter Press services hydraulic systems.
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