Transformers are a major source of power supply to any industry.
The conversion of voltage level can cause serious damage to a person or to the nearby area if not kept under tight protection measures. It is the duty of safety inspector to run the following condition assessments on the transformer with the following checklist −
Main transformer inspection check list
| Task | Yes | No | N/A | Comments |
| Main Tank | ||||
| Paint System in Good condition | ||||
| Rust Observed | ||||
| Tank grounds in Good condition | ||||
| Conduits and fittings secure | ||||
| External core ground provider | ||||
| Oil Leakage observed | ||||
| Cooling system | ||||
| Radiator or cooler fins cleaned | ||||
| All valves to main tank open and secure | ||||
| All fins in place and operational | ||||
| All oil pumps in place and operational | ||||
| Oil flow indicators function properly | ||||
| Excessive vibration or noise observed | ||||
| Leaking of oil if any | ||||
| Oil Preservation | ||||
| Positive pressure of inert gas | ||||
| Proper setting of regulator of Nitrogen blanket | ||||
| Correct pressure check of gas blanket | ||||
| Bushing | ||||
| All clean and zero defect | ||||
| Proper check of oil levels | ||||
| Oil leakage if any | ||||
| De-energized tap changer (DETC) | ||||
| Location of Position indicator tap | ||||
| Locking mechanism checked | ||||
| Load Tap Changer (LTC) | ||||
| Location of Position indicator tap | ||||
| Silica gel breather | ||||
| Oil leakage if any | ||||
| Control Cabinet | ||||
| Connections/components in good condition | ||||
| Weather tight seals checked | ||||
| Strip heaters checked | ||||
| Protective devices | ||||
| Oil Temp indicator reading | ||||
| Oil Temp indicator set points | ||||
| Winding Temp indicator reading | ||||
| Winding Temp indicator set points | ||||
| Buchholtz relay alarm/trip | ||||
| Gas detector alarm/trip |
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