A detailed Air Cooled Transformer SEMI ANNUAL preventive maintenance checklists 1. Visual Inspection
Visual Inspection
- Look for cracks, dents, or deformation.
- Check for any loose or missing screws.
- Assess the overall integrity of the housing.
- Examine painted surfaces for flaking or discoloration.
- Look for any signs of rust on exposed metal.
- Document areas needing protective coatings.
- Check for tight seals around access points.
- Verify that no covers are missing.
- Test the latch or fasteners for functionality.
- Remove any loose materials or trash.
- Check for vegetation or obstructions.
- Ensure clear pathways for maintenance access.
- Inspect for oil stains or puddles.
- Check hoses and connections for signs of wear.
- Mark areas needing immediate attention.
- Check for dirt, debris, or foreign objects.
- Ensure airflow is unobstructed.
- Clean any clogged areas as necessary.
- Check for wear, tears, or degradation.
- Ensure materials are securely attached.
- Replace damaged insulation as needed.
- Check all grounding points for tightness.
- Inspect for rust or corrosion on connectors.
- Ensure proper grounding path continuity.
- Inspect wiring insulation for melting.
- Look for discoloration on nearby surfaces.
- Identify components showing signs of heat stress.
- Check that all safety labels are present.
- Ensure text is clear and readable.
- Replace faded or damaged labels.
- Inspect vents for blockages or restrictions.
- Verify airflow through ventilation openings.
- Clean any obstructed pathways.
- Check bolts and screws for tightness.
- Inspect supports for any damage.
- Replace any worn or damaged hardware.
- Check for nests or droppings.
- Inspect for gnaw marks on insulation or wiring.
- Implement pest control measures if necessary.
- Inspect for cracks or abrasions.
- Check for proper securing of wiring.
- Replace damaged wiring as needed.
- Check for cracks or bends in blades.
- Clean dust buildup from cooling fins.
- Ensure fans are functioning correctly.
- Use a level to check transformer alignment.
- Adjust mounting as necessary.
- Ensure all connections are aligned properly.
- Check for proximity of other equipment.
- Inspect for any structural damage nearby.
- Ensure clear space for maintenance access.
Electrical Connections
Cooling System
Operational Testing
- Inspect all indicator lights for proper functionality.
- Verify that all meters are displaying expected readings.
- Check for any flickering or abnormal color changes in lights.
- Ensure all indicators are clean and unobstructed for visibility.
- Connect the transformer to a known load condition.
- Monitor performance metrics such as voltage and current.
- Assess stability and response to load changes.
- Document any anomalies during the load test.
- Use calibrated thermometers to check temperature at key points.
- Compare readings against manufacturer specifications.
- Look for hotspots or unusual temperature gradients.
- Record temperature data for trend analysis.
- Log voltage, current, and temperature readings systematically.
- Include date and time for each recorded parameter.
- Ensure records are kept in a safe, accessible location.
- Use standard forms for consistency in data collection.
- Check that all cooling fans are running smoothly.
- Listen for unusual noises that may indicate issues.
- Ensure airflow is unobstructed and adequate for cooling.
- Confirm that fan controls are responding correctly.
- Listen carefully for any grinding or rattling noises.
- Feel for excessive vibrations on the transformer casing.
- Investigate any irregularities immediately to prevent damage.
- Document any findings for further analysis.
- Use a multimeter to accurately measure voltage levels.
- Compare findings against specified operational limits.
- Document all measurements, noting any irregularities.
- Report any deviations to maintenance personnel.
- Manually test relays and breakers to ensure they trip as designed.
- Monitor performance during normal and fault conditions.
- Check settings against manufacturer specifications.
- Document the results of the assessment.
- Use an earth resistance tester to check grounding integrity.
- Verify that resistance values are within safe limits.
- Inspect all grounding connections for corrosion or wear.
- Document the grounding test results for records.
- Use a harmonic analyzer to measure output harmonics.
- Compare results against regulatory compliance limits.
- Document any excessive harmonics for further investigation.
- Report findings to ensure compliance with specifications.
- Use a megohmmeter to test insulation resistance.
- Record resistance values for both primary and secondary windings.
- Compare results with manufacturer specifications.
- Investigate any low resistance readings immediately.
- Test all alarms for audible and visual functionality.
- Verify that monitoring systems are accurately displaying data.
- Check backup systems for proper operation.
- Document the status of each auxiliary device.
- Obtain the latest manufacturer specifications for reference.
- Compare operational data with specifications systematically.
- Identify any performance discrepancies and document them.
- Prepare a report for maintenance review.
- Gradually increase load while monitoring performance.
- Record voltage, current, and temperature at each load level.
- Assess the transformer's stability and response.
- Document findings for future reference.
Use in Manifestly