An Annual Maintenance Contract (AMC) for transformers is a service agreement between the transformer owner and a maintenance service provider. The purpose of the AMC is to ensure that transformers receive regular inspection, preventive maintenance, and necessary repairs to maintain their reliability and performance. Here's a general guide for an AMC of transformers:

1. Scope Definition:

• Clearly define the scope of the AMC, including the type and rating of transformers covered, the frequency of maintenance visits, and the specific tasks to be performed.

2. Comprehensive Inspection:

• Conduct a comprehensive inspection of transformers to assess their overall condition.
• Check for signs of physical damage, oil leaks, overheating, and any abnormalities in components.

3. Oil Analysis:

• Collect oil samples for routine oil analysis to assess the condition of the insulating oil.
• Perform dissolved gas analysis (DGA) to detect potential faults and monitor the transformer's health.

4. Electrical Testing:

• Conduct electrical tests such as insulation resistance, power factor, turns ratio, and winding resistance to evaluate the transformer's electrical integrity.

5. Cooling System Inspection:

• Inspect the cooling system components, including radiators, fans, and pumps.
• Ensure proper airflow and cooling efficiency.

6. Tap Changer Maintenance:

• Check the tap changer mechanism for proper operation.
• Lubricate moving parts and inspect contacts for wear.

7. Bushings and Insulators:

• Inspect bushings and insulators for cracks, leaks, or other signs of degradation.
• Check for proper electrical connections.