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Time：2025-05-12 14:10:52 Reading volume：
Transformer oil degassing equipment introduction
Transformer oil degassing equipment is a device specially used to remove dissolved gases (such as O₂, N₂, H₂, CH₄, CO, etc.) and trace moisture in transformer oil to improve the oil's insulation strength, antioxidant capacity and equipment operation reliability.
- Dissolved gas hazards:
- O₂: accelerates oil oxidation and forms acidic substances.
- H₂, CH₄, C₂H₂: fault gases that may cause partial discharge or explosion.
- N₂: reduces the insulation performance of the oil.
- Moisture influence:
- Reduce dielectric strength (for every 10 ppm increase in moisture, the breakdown voltage decreases by about 10%).
(1) Vacuum degassing method (mainstream technology)
- Principle: Heat the oil (50~70℃) in a high vacuum environment (≤0.1 mbar) to evaporate and separate the dissolved gas and water.
- Key steps:
1. Heating: reduce oil viscosity and improve gas release efficiency.
2. Atomization/thin film evaporation: increase the oil surface area (such as spraying, centrifugal film).
3. Vacuum extraction: exhaust gas and water through a vacuum pump.
- Effect:
- Gas content ≤0.1% (volume ratio), water ≤10 ppm.
(2) Membrane separation degassing (emerging technology)
- Principle: Use selective permeable membranes to separate gases (such as polyimide membranes that preferentially permeate H₂ and O₂).
- Advantages: low energy consumption, suitable for small systems.
- Limitations: low efficiency in treating high-viscosity oil.
(3) Ultrasonic degassing (auxiliary technology)
- Principle: Ultrasonic cavitation promotes gas precipitation, often used in conjunction with a vacuum.
- Applicable scenarios: trace gas removal (such as H₂).
| Components | Function |
|-------------------|---------|
| Vacuum pump | Maintain a high vacuum environment (commonly used rotary vane pump, Roots pump) |
| Degassing tower/tank | Atomize or evaporate oil in a thin film to increase gas-liquid contact area |
| Heating system | Constant temperature control (50~70℃) |
| Condenser | Condensate and recover volatile light oil |
| Gas detector | Online monitoring of O₂, H₂ and other gas content |
| Control system | Automatically adjust vacuum degree, temperature, and flow |
1. Oil inlet → 2. Preheating (50~70℃) → 3. Coarse filtration (25 μm) → 4. High vacuum degassing (≤0.1 mbar) → 5. Fine filtration (1~5 μm) → 6. Oil output detection.
| Parameters | Requirements |
|------------------|----------|
| Vacuum degree | ≤0.1 mbar (absolute pressure) |
| Processing temperature | 50~70℃ (avoid oil oxidation) |
| Gas residue | ≤0.1% (volume ratio) |
| Water residue | ≤10 ppm |
| Processing capacity | 1000~10000 L/h (depending on transformer capacity) |
- New oil treatment: degassing before injection into the transformer.
- Inspection and maintenance: removal of fault gases (such as H₂, C₂H₂) generated during operation.
- Fault recovery: oil regeneration of damp or cavitation transformers.
- Large power plants: Choose a high-flow (≥5000 L/h) vacuum degassing system, such as the GlobeCore VFD series.
- Mobile maintenance: Vehicle-mounted degassing equipment (such as the Pall PSS series).
- High-precision requirements: Combined with membrane separation + vacuum composite technology.
- Explosion-proof design: ATEX standards must be met when handling combustible gases (H₂).
- Vacuum tightness: Regularly check O-rings and valves.
- Waste oil treatment: Light oil recovered by condensation must be professionally disposed of.
Transformer oil degassing equipment uses high vacuum + heating + atomization technology to efficiently remove harmful gases, and is a key equipment to ensure the safe operation of transformers. When selecting, it is necessary to match the technical solution according to the oil volume, gas type, and accuracy requirements, and strictly follow the IEC 60422 standard for maintenance.
