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power Transformer inspection checklist

Visual Inspection

Check for any physical damage or corrosion on the transformer body and components.

Inspect the cooling system for leaks or blockages.

Ensure that all connections and terminals are tight and properly insulated.

Inspect the bushings for any signs of damage or deterioration.

Check the condition of the gaskets and seals.

Inspect the tap changer mechanism for any abnormalities or malfunctions.

Verify that all warning labels and nameplates are in place and legible.

Inspect the oil level and condition, including color and odor.

Check for any signs of oil leakage or contamination.

Inspect the transformer for any signs of overheating such as discoloration or burnt marks.

Electrical Inspection

Measure and record the winding resistance for all phases.

Inspect the insulating materials for signs of degradation or aging.

Perform a dielectric strength test on the transformer oil.

Verify the insulation resistance between windings and ground.

Check the operation and accuracy of all protective relays.

Inspect the control circuits and wiring for any defects or loose connections.

Perform a power factor test to assess the condition of the insulation.

Measure and record the voltage ratio and phase displacement.

Inspect the grounding system for proper installation and conductivity.

Mechanical Inspection

Check the condition and alignment of the core and windings.

Inspect the condition of the cooling fans or radiators.

Verify the operation of the pressure relief devices.

Inspect the condition of the conservator and its accessories.

Check the condition and operation of the Buchholz relay.

Inspect the condition and operation of the pressure/vacuum gauge.

Verify the operation and condition of the temperature monitoring devices.

Inspect the condition and operation of the explosion venting system.

Documentation and Testing

Review the transformer maintenance records and history.

Perform a polarity and turns ratio test.

Conduct a short-circuit impedance test.

Verify the accuracy of the temperature indicators and alarms.

Test the operation of the on-load tap changer.

Check the accuracy and calibration of all measuring instruments.

Document all inspection findings and testing results.

It is important to note that this checklist is a general guideline, and specific inspection procedures may vary depending on the transformer type, size, and manufacturer's recommendations.

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