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Transformer preventive maintenance checklist

1. Visual Inspection

Check for signs of oil leaks around the transformer.

Inspect for physical damage to the transformer casing.

Examine grounding connections and ensure they are secure.

Inspect cooling fins and radiators for dirt, debris, or blockages.

Verify that all labels and identification plates are legible.

2. Electrical Testing

Perform insulation resistance testing on windings.

Conduct power factor testing on bushings.

Measure circuit breaker operation and settings.

Test secondary connections for tightness and corrosion.

Monitor transformer temperature to ensure it operates within specified limits.

3. Fluid Analysis

Collect and analyze insulating oil samples for dielectric strength.

Test for moisture content in the insulating oil.

Check for dissolved gases (DGA) in the oil to identify potential issues.

Inspect for particulate contamination in the oil.

Review historical fluid analysis reports for trends.

4. Mechanical Components

Inspect and test the operation of cooling fans and pumps.

Check the condition of the tap changer and its operation.

Verify that ventilation paths are clear and unobstructed.

Inspect and test all mounting and support structures for integrity.

Ensure that all access panels and doors close securely.

5. Documentation and Reporting

Update maintenance logs with findings and actions taken.

Document any anomalies or issues that require follow-up.

Review and update maintenance procedures as necessary.

Schedule follow-up inspections or repairs based on findings.

Communicate results with relevant stakeholders and team members.

6. Safety and Compliance

Ensure all safety protocols are followed during inspections.

Verify that personal protective equipment (PPE) is used.

Confirm that work areas are clear and safe for maintenance activities.

Review compliance with local and national electrical standards.

Conduct a review of emergency response procedures related to transformer operations.

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