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Variable-Pressure Vacuum Transformer Coil Drying Oven | Energy-Efficient Vacuum Drying FurnaceEngineered with German Dr. Moll’s variable-pressure principle, this vacuum drying furnace specializes in oil-immersed power transformer bodies (≤110kV). It replaces conventional hot-air cycling, reducing drying cycles by 30-45% (e.g., 110kV/63000kVA in 70-80 hours). The heating system with power control module uses only ~35% of total power during temperature keeping. Extreme vacuum (<50Pa cold, <10Pa system), ±2°C precision, and Siemens PLC enable unattended, stable operation. Special baffle valves, condensation filter, and oil heating ensure no core rust and prolonged vacuum pump life. Key Highlights:
Achieve superior drying quality and lower cost. 
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Description
1. Overview This variable-pressure vacuum transformer coil drying oven adopts the variable-pressure drying principle suggested by Dr. Moll (Germany). It is specialized for drying transformer bodies and coils (oil-immersed, ≤110kV). Compared to conventional vacuum hot air cycling, the drying cycle is saved by about 30-45%, with significant electric consumption reduction. The equipment guarantees process and quality requirements for 10kV, 35kV, and 110kV transformer products. 2. Key Technical Parameters
3. Core Advantages & Features ① Variable-Pressure Drying Principle Automatically repeats pressure alternating modes during heating, periodically reducing tank pressure to create optimal conditions for water evaporation from insulation. This ensures reasonable drying state, shortens time, and effectively prevents iron core rust. ② Energy-Efficient Heating Power control module ensures even, stable temperature. Real power consumption during temperature keeping is only ~35% of total power, with no heating load fluctuation, extending heating tube life. ③ High Vacuum & Condensation Extreme high vacuity (<30Pa cold condition for tank, <10Pa system) with special baffle valves. Low-temperature condensation filter avoids vacuum pump pollution, greatly prolonging pump service life. ④ Siemens PLC Automation Full automatic control of vacuity, heating, and cooling. Supports manual/auto modes; unattended automatic drying. Stable, reliable, domestic advanced automation level. ⑤ Compact & Customized Square tank design, small occupation. Tank size customized per requirement. Door opening mechanism, hydraulic/pneumatic systems integrated. ⑥ Quality & Rust Prevention Variable pressure adjustment solves core rust problem. Processed products reach superior industry quality. Suitable for 10kV, 35kV, 110kV transformer coil/body drying. 4. Main Equipment Components
5. On-Site Requirements
6. Application Scope
→ Contact our engineering team for a detailed quotation, technical layout, or factory demonstration.
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