How should a plant investigate and close electrical thermography exceptions?
An infrared image is a screening observation, not a diagnosis. Safe followup depends on load, comparable equipment, documented conditions and an authorized electrical work process.
Capture comparable operating conditions
Record equipment ID, date, ambient conditions, electrical load, camera settings, emissivity assumptions and accessible viewing position. Compare similar phases and connections under similar loads. An apparent temperature difference can be caused by reflections or dissimilar surfaces.
Classify the anomaly without inventing a universal temperature threshold
Use the site electrical maintenance program, equipment manufacturer guidance, qualified thermographer interpretation and criticality to assign priority. A high consequence feeder with a modest abnormality may need faster action than a noncritical component. Never open energized equipment solely to improve an image without an approved electrical safety assessment.
Plan safe verification and repair
Have qualified personnel review inspection evidence, operating trends and any related alarms. Define the required outage, isolation, arc flash controls and acceptance criteria before intrusive work. Determine whether the cause is loose termination, overload, imbalance, damaged contact or measurement artifact using appropriate methods.
Industrial example
A motor control center scan flags one phase connection hotter than the others. The team confirms similar phase currents, schedules safe isolation, finds a damaged lug and replaces it under an approved work package. The followup scan at comparable load documents the repair outcome.
Close the feedback loop
Attach original and postrepair images to the work order, record the confirmed defect and repeat inspection date. Trend recurring anomalies by asset and failure mechanism rather than counting thermal images as completed repairs.
Implementation checklist
- Capture load and imaging conditions
- Assign risk based priority and qualified reviewer
- Define safe verification and repair criteria
- Retain comparable postrepair evidence
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