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Time:2025-04-03 11:03:59 Reading volume:
Temperature control of transformer oil during filtration is crucial. Excessive temperature may cause oil oxidation, aging or additive decomposition. Specific requirements are as follows:
- General standards:
- The maximum temperature does not exceed 65℃ (common range: 50~60℃).
- Some high-precision vacuum oil filters allow a short-term temperature rise to 70℃ (time must be strictly controlled).
- IEC 60422: It is recommended that the oil filtration temperature should not exceed 60℃ to avoid thermal degradation of oil quality.
- GB/T 14542-2017 (Transformer Oil Maintenance Guide): Requires that the oil temperature should be ≤65℃ during oil filtration.
- Oil oxidation: At high temperatures, oil reacts with oxygen to generate acid and sludge, which reduces insulation performance.
- Additive decomposition: Some antioxidants (such as DBPC) may fail at >70℃.
- Uneven evaporation of water: Local overheating may lead to incomplete evaporation of water, affecting the vacuum dehydration effect.
| Filtration process | Recommended temperature range | Description |
|--------------------|------------------|-----------------------------------|
| Vacuum oil filtration (dehydration and degassing) | 50~60℃ | Optimal balance point: fast evaporation of water, low oxidation risk |
| Pressure oil filtration (particle filtration) | 40~55℃ | Avoid high temperature causing filter element blockage or damage |
| Centrifugal oil filtration | ≤60℃ | High temperature may affect the sealing performance of the centrifuge |
- Real-time monitoring: The oil filtration equipment should be equipped with a temperature sensor and an over-temperature automatic alarm or shutdown.
- Preheating control: When starting with cold oil, it needs to be heated slowly (heating rate ≤5℃/hour) to avoid local overheating.
- Ambient temperature: In winter, in a low temperature environment, the oil needs to be preheated to ≥20℃ before filtering to prevent viscosity from affecting the flow rate.
- High water content oil: If the water content is seriously exceeded (>50 ppm), the temperature can be temporarily raised to 65℃ to improve dehydration efficiency, but the processing time needs to be shortened.
- Regeneration of old oil: The temperature needs to be carefully controlled (≤60℃) to avoid further polymerization of oxidation products.
The transformer oil filtration temperature should be strictly controlled below 65℃, and the ideal range is 50~60℃. In actual operation, it is necessary to combine the equipment type, oil quality status and standard requirements, and give priority to ensuring the chemical stability of the oil.