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Oil-immersed transformers excel in insulation strength, cooling efficiency, and overload capacity, making them the preferred choice for high-power applications.
1. Pre-Operation Checks
Oil Quality Inspection for Oil-Immersed Transformers
New oil breakdown voltage ≥35kV/2.5mm
Moisture content ≤20ppm
Sealing System Verification for Oil-Immersed Transformers
Replace silica gel if >2/3 discolored
Oil level in conservator must be 1/4~3/4 of gauge mark
2. Operational Monitoring
| Parameter | Threshold for Oil-Immersed Transformers | Consequences of Exceeding Limits |
|---|---|---|
| Top oil temperature | ≤85℃ | Accelerated aging of insulating oil in oil-immersed transformers |
| Winding hot-spot | ≤95℃ | Sharp increase in gas generation inside oil-immersed transformers |
| Dissolved gas | H₂≤150μL/L | Early warning of latent faults in oil-immersed transformers |
3. Exclusive Maintenance for Oil-Immersed Transformers
Breather Maintenance for Oil-Immersed Transformers
Quarterly inspection of breather oil seal
Must close breather valve before replacing silica gel in oil-immersed transformers
Tap Changer Operation for Oil-Immersed Transformers
De-energize oil-immersed transformers before adjustment
Oil sample testing required after operation in oil-immersed transformers
4. Emergency Procedures for Oil-Immersed Transformers
Gas Relay Alarm in Oil-Immersed Transformers
Immediately collect gas samples from oil-immersed transformers
Compare with historical DGA data of oil-immersed transformers
Major Oil Leakage in Oil-immersed Transformers
Emergency shutdown of oil-immersed transformers
Apply specialized leak-sealing compound for oil-immersed transformers
5. Special Scenarios for Oil-Immersed Transformers
Arctic regions: Oil-immersed transformers require low-temperature heaters
Chemical plants: Oil-immersed transformers need corrosion-resistant bushings
Humid environments: Daily breather checks for oil-immersed transformers