1. Why Predictive Thermography Matters
Every electrical and mechanical failure is preceded by abnormal heat generation. Before a busbar joint fuses, an insulated cable melts, or a bearing seizes, the junction temperature rises significantly above ambient levels due to increased electrical resistance ($P = I^2R$) or mechanical friction.
Infrared Thermography allows certified engineers to inspect live electrical installations and rotating equipment under full operational load without interrupting factory production.
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2. The Delta-T (ΔT) Severity Matrix
Thermal scanning is not just about capturing pretty false-color pictures; it requires scientific quantification of temperature differences ($Delta T$). Athul Energy utilizes the standardized ASTM E1934 / NFPA 70B severity criteria:
| Severity Level | Temperature Rise ($Delta T$) Above Baseline | Recommended Corrective Action |
| Minor (Advisory) | 1°C to 10°C | Repair during next scheduled maintenance shutdown. |
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| Moderate (Intermediate) | 11°C to 20°C | Schedule inspection and maintenance within 7 to 14 days. |
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| Critical (Serious) | 21°C to 40°C | Urgent maintenance required within 24 to 48 hours. |
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| Emergency (Danger) | > 40°C | Immediate intervention required. High risk of flashover, insulation melt, or fire. |
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3. Electrical Switchboard Inspection Protocols
For an infrared scan to be valid, the following electrical conditions must be observed:
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4. Mechanical Thermography: Bearings & Couplings
Beyond electrical panels, thermal imaging provides indispensable insights for mechanical equipment:
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5. Best Practices During an Infrared Survey
1. Conduct surveys at peak production hours when transformers and switchgear carry maximum current. 2. Pair every thermal radiograph with a standard digital photograph for exact component identification. 3. Record ambient temperature, relative humidity, and operating current on the report. 4. Verify hot spots using contact surface pyrometers to cross-reference optical emissivity.
Athul Energy deploys NABL-calibrated Level-II FLIR cameras with high spatial resolution to deliver comprehensive thermal inspection dossiers.
