How To Check Dry-type Transformer?

1. Is there any abnormal sound or vibration?
2. Whether there is any discoloration caused by local overheating, harmful gas corrosion, etc. that may cause creepage traces and carbonization on the insulation surface.
3. Check whether the air cooling device of the transformer is operating normally.
4. There should be no overheating in the high and low voltage joints. There should be no leakage or creepage in the cable heads.
5. The temperature rise of the winding should be based on the insulation material grade used in the transformer, and the temperature rise should not exceed the specified value.
6. The supporting porcelain bottle should have no cracks or traces of discharge.
7. Check whether the winding clamp is loose.
8. Indoor ventilation and iron core air ducts should be free of dust and debris, and the iron core should be free of rust or corrosion.