(1) Civil construction part:
1. The foundation of the box transformer is complete and without cracks;
2. The trench of the box transformer is clean, free of water, and ventilated The holes are smooth and there are no metal parts.
3. Rusty and well grounded.
(2) Cabinet part:
1. Check whether the box shell is corroded, deformed or have large gaps;
2. Check whether there is leakage, water leakage or frost in the box transformer;
3. The outside of the box transformer should be kept clean and free of stickers, and the door locks of the box transformer should be intact and configured correctly.
4. The box transformer box is grounded and the nameplate is intact.
(3) High voltage part:
1. The name and number of the isolating switch are not damaged.
2． The position indication of the isolating switch is correct.
3. Sulfur hexafluoride switching gas is within the allowable range.
4. Elbow cable joints are in tight contact and intact.
5． The arrester is clean, undamaged and has no discharge phenomenon.
6． The live indicator and short circuit fault indicator indicate correctly.
7． The high-pressure chamber door is closed tightly.
8. The holes for high-voltage incoming and outgoing cables are well sealed.
(4) Transformer part:
1. Key points for inspection of dry-type transformers: Check the bottom and ends of the insulators and windings for dust accumulation. If there is, compressed air with a pressure not exceeding 2 atmospheres should be used to blow away the dust on the ventilation ducts and surfaces. It is forbidden to touch during the operation inspection. During observation, you should pay attention to whether the fastening parts are loose and hot, whether there are cracks, creepage and carbonization marks on the winding insulation surface, and whether the sound is normal.