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Transformer PPM checklist

Visual Inspection

Check for any visible physical damage on the transformer body, windings, and bushings.

Inspect for any signs of oil leakage or excessive moisture.

Verify that the transformer is properly grounded.

Ensure that all warning labels and safety signs are in place.

Inspect the condition of the transformer's exterior, including paint, corrosion, and cleanliness.

Oil and Cooling System

Measure the oil level and ensure it is within the recommended range.

Check the oil color and clarity; if it appears dirty or contaminated, consider oil replacement.

Inspect the oil pressure gauge and ensure it is functioning correctly.

Verify that the cooling fans or radiators are clean and free from debris.

Check the cooling system pumps for proper operation and any signs of leakage.

Electrical Connections

Inspect the condition of the primary and secondary bushings.

Verify the tightness of all electrical connections, including taps, leads, and grounding connections.

Check for any signs of overheating or discoloration on the terminals or connections.

Measure the insulation resistance between windings and between windings and the ground.

Protective Devices

Test the operation of the Buchholz relay, if applicable.

Verify the functionality of the pressure relief devices.

Inspect the operation of the temperature monitoring devices, such as thermometers or temperature gauges.

Test the operation of the overcurrent and differential relays.

Ensure that all protective devices, such as fuses and circuit breakers, are in good working condition.

General Checks

Verify that the transformer nameplate data is accurate and legible.

Check the accessibility and functionality of all control switches and indicators.

Review the maintenance records and log any recent repairs or inspections.

Verify the tightness of all external connections and terminals.

Measure the insulation resistance between windings and between windings and the ground.

Documentation and Reporting

Document all findings, including any abnormalities or issues discovered.

Report any critical or urgent maintenance requirements to the relevant personnel.

Prepare a detailed report summarizing the inspection results and recommended actions.

Submit the report to the appropriate engineering department or management for review and further action.

Note: This checklist may still vary depending on the specific requirements and standards of the engineering organization.

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