Infrared Thermography
Component-Based Thermal Inspections
Infrared thermography allows equipment temperature patterns to be evaluated while electrical systems remain energized and operating under load. These inspections can identify abnormal heating, unexpected temperature differences, and other thermal conditions that may indicate developing equipment problems.
RATTLIR provides thermal inspections of high-voltage electrical infrastructure, medium-voltage switchgear, and critical industrial equipment. Our approach focuses on evaluating individual components, understanding their expected thermal behavior, and documenting conditions that may require further attention.
A Component-Based Approach
RATTLIR's thermal inspections go beyond simply searching for hot spots. Individual components are evaluated based on their function, operating conditions, and expected thermal characteristics.
Each component is measured and compared against corresponding components on other phases or similar equipment operating under comparable conditions. Temperature differences (ΔT) are recorded and evaluated using applicable NETA guidelines, with consideration given to equipment loading, operating conditions, and measurement limitations.
Findings are assigned criticality ratings to help determine the need for further investigation, continued monitoring, or planned corrective maintenance.
These measurements also provide trendable data for future inspections, allowing changes in component temperatures and ΔT values to be tracked over time. This helps identify developing conditions and supports long-term maintenance planning.
Thermal Inspection Examples
Developing equipment problems aren't always apparent during routine visual inspections. The following examples illustrate how infrared thermography can reveal abnormal thermal conditions and provide information that helps maintenance personnel determine where further investigation may be needed.
Bolted Connection
A localized hot spot was identified at a bolted electrical connection by comparing its temperature with corresponding connections on the other phases. This thermal pattern is consistent with increased contact resistance and may indicate a loose or deteriorating connection.
Disconnect Switch
A thermal inspection identified elevated temperatures at a high-voltage disconnect switch, consistent with increased contact resistance. Early identification allowed the facility to address the condition during a planned shutdown, before equipment damage occurred.
GSU Oil Cooler
An abnormal thermal pattern was identified on a GSU oil cooler when compared with the other coolers. Although the inlet piping indicated warm oil entering the cooler, the expected temperature gradient across the cooling surface was absent. This condition was consistent with restricted or inadequate oil circulation through the cooler
Discuss Your Thermal Inspection Needs
Whether you're planning a comprehensive switchyard assessment or evaluating specific equipment concerns, RATTLIR can develop an inspection scope tailored to your facility and operating conditions.
Contact RATTLIR to Discuss and Inspection.
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