Definition
Thermography is a non-contact inspection technique that captures a thermal (infrared) image of a component, connection, or system, revealing surface temperature patterns invisible to the naked eye (a loose electrical connection running hotter than normal, an overheating bearing, or insulation failure) without requiring physical contact or shutdown.
Key facts
- A non-contact technique, allowing inspection of energized electrical equipment without direct contact.
- Reveals relative temperature patterns and hot spots, not internal condition: a follow-up investigation is often needed to confirm cause.
- Common applications include electrical connections, switchgear, motors, and insulation inspection.
- Requires understanding of normal baseline temperature and emissivity considerations to interpret readings correctly.
How does Thermography work in maintenance?
Thermography reveals the surface temperature distribution of a component or system through an infrared camera image, highlighting hot spots or abnormal temperature patterns (a connection running hotter than its neighbors, an unusually warm bearing housing) that indicate a developing electrical or mechanical problem.
What does Thermography require?
Thermographic images are typically compared against a baseline (normal operating temperature) or against similar equivalent points (comparing three phases of a connection, for example) to identify anomalies, which then warrant further investigation to confirm the underlying cause before corrective action is planned.
FAQ
Frequently asked questions
What condition information does a thermal image provide?
Thermography provides it: a non-contact thermal image revealing surface temperature patterns, such as a hot electrical connection or overheating bearing, that indicate a developing problem warranting further investigation.
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