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Run: Transformer Oil Sampling and DGA Submittal Inspection

Transformer oil sampling and DGA submittal inspection template for verifying sample integrity, chain of custody, and lab interpretation before you rely on th...

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Inspection Identification and Sample Context

Transformer identification recorded critical (required)

Verify transformer asset ID, location, voltage class, and unit designation are documented on the inspection record.

Sampling date and time recorded critical (required)

Record the exact date and time the oil sample was collected.

Note (optional)

Sampling purpose documented

Identify whether the sample was routine trending, post-event, alarm follow-up, acceptance testing, or corrective maintenance.

Sampling personnel are trained and authorized critical (required)

Confirm the person collecting the sample is trained on transformer oil sampling procedures and authorized by the site program.

Yes No N/A

Sampling Safety and Field Conditions

Work area made safe before sampling critical (required)

Verify applicable electrical safety controls were in place, including required PPE, approach boundaries, and any lockout-tagout or energized work controls as applicable.

Yes No N/A

Sampling port and surrounding area clean and accessible critical (required)

Inspect that the sampling valve, fittings, and surrounding surfaces are clean, dry, and unobstructed before collection.

Yes No N/A

Sample container is clean, sealed, and appropriate for DGA critical (required)

Confirm the container is suitable for dissolved gas analysis, intact, and free of visible contamination or damage.

Yes No N/A

Ambient conditions noted if relevant

Document weather, temperature, or site conditions that could affect sampling quality or handling.

Sampling Method and Sample Integrity

Sampling line flushed before final sample collection critical (required)

Verify the sampling line or valve was flushed per site procedure to remove stagnant oil before the final sample was taken.

Yes No N/A

Air excluded from sample during collection critical (required)

Confirm the sample was collected in a manner that minimizes air ingress and bubble formation.

Yes No N/A

Sample volume adequate for laboratory DGA critical (required)

Record the collected sample volume and verify it meets the laboratory's minimum requirement for gas chromatography analysis.

Sample identification label complete critical (required)

Confirm the sample label includes asset ID, sample date/time, sampler name or ID, and unique sample number.

Yes No N/A

Chain of Custody and Laboratory Submittal

Chain-of-custody form completed critical (required)

Verify the chain-of-custody form is complete, legible, and matches the sample label and asset identification.

Yes No N/A

Sample custody transfer documented critical (required)

Record each handoff from collector to courier to laboratory, including date/time and responsible party.

Shipping method protects sample integrity critical (required)

Confirm the sample was packaged and shipped to prevent leakage, breakage, heat exposure, and contamination.

Yes No N/A

Laboratory receiving confirmation obtained

Document laboratory receipt date/time and confirmation that the sample was accepted for DGA testing.

Note (optional)

DGA Results and Interpretation

Required dissolved gas results reported critical (required)

Verify the report includes the key gases needed for transformer condition assessment, including hydrogen, methane, ethane, ethylene, acetylene, carbon monoxide, and carbon dioxide as applicable.

IEEE C57.104 interpretation included critical (required)

Confirm the report or review notes include interpretation consistent with IEEE C57.104 guidance and any applicable trending comparison.

Yes No N/A

Duval triangle assessment documented

Record whether the Duval triangle result indicates thermal fault, partial discharge, arcing, or no clear fault signature.

Note (optional)

Recommended follow-up action documented critical (required)

Document the next action, such as resample, trend monitoring, maintenance review, or urgent engineering evaluation.

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