Routine visual inspections should be done monthly, while comprehensive maintenance such as oil testing, electrical testing, and insulation resistance checks should be performed annually or bi-annually, depending on load conditions and operating environment.
Look out for:
Unusual noise or vibrations
Oil leaks or discoloration
Overheating or unusual temperature rise
Burning smell or insulation breakdown
Irregular load fluctuations or tripping
Transformer oil acts as both an Insulator and Coolant. Testing checks for Moisture, Acidity, Dielectric Strength, Furanic and Gas Formation, helping detect early signs of internal faults or insulation degradation before a major failure occurs.
De-energise and isolate the transformer
Use proper grounding
Wear PPE (Personal Protective Equipment)
Ensure no residual voltage remains
Follow lockout/tagout procedures
Neglecting maintenance can lead to:
Overheating and insulation failure
Oil contamination and internal arcing
Short circuits and breakdown of windings
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