Transformer maintenance is crucial for ensuring reliability and preventing failures. It typically includes the following key aspects:

1. Routine Inspection & Testing

✅ Visual Inspection – Check for leaks, corrosion, loose connections, and physical damage.
✅ Oil Level & Quality Check – Measure dielectric strength, moisture content, acidity, and dissolved gases (DGA).
✅ Temperature Monitoring – Ensure proper cooling system function, check winding and oil temperature.
✅ Bushing & Insulation Check – Look for cracks, tracking, or contamination on insulators.
✅ Connections & Terminal Tightness – Prevent overheating and loose connections.

2. Preventive Maintenance

🔹 Oil Filtration & Reconditioning – Maintain dielectric properties and remove contaminants.
🔹 Cooling System Maintenance – Clean radiators, check oil pumps, fans, and temperature sensors.
🔹 Silica Gel Replacement – Maintain proper moisture control in the breather.
🔹 Tap Changer Maintenance – Clean contacts, check for wear, and lubricate moving parts.

3. Predictive Maintenance

🔸 Dissolved Gas Analysis (DGA) – Detect early signs of faults by analyzing gas levels in transformer oil.
🔸 Thermographic Imaging – Identify hot spots and potential overheating issues.
🔸 Partial Discharge Testing – Detect insulation degradation.

4. Corrective Maintenance

⚙️ Leak Repairs – Fix oil leaks in bushings, gaskets, and welds.
⚙️ Component Replacement – Replace deteriorated bushings, cooling fans, or gaskets.
⚙️ Rewinding & Core Repairs – If required for older transformers showing insulation breakdown.