The abnormal operation of transformers will lead to serious safety accidents. If regular maintenance and testing work is carried out according to the maintenance methods of transformers, it will ensure the safe and smooth operation of transformers.

Transformers should be maintained once before operation, and transformers in operation or shutdown should be regularly maintained once a year.

Maintenance methods for transformers:

1. Connect the backup transformer, disconnect the high and low voltage circuit breakers of the transformer to be repaired, remove the operation fuse of the power supply, close the grounding switch, fully discharge the transformer, lock the high voltage cabinet, and place a “stop closing” sign at the switch.

2. Maintenance of dry-type transformers, cleaning of ceramic sleeves and casings to ensure cleanliness and tidiness, inspecting the casings, gaskets, and ceramic sleeves for cracks, discharge marks, or aging of rubber pads, and checking for deformation of cables and busbars. Any problems should be promptly resolved.

3. Check if the contact surface of the busbar is clean. If there is an oxide layer on the contact surface, it should be removed and coated with electric composite grease.

4. Check whether the transformer is well grounded, whether the ground wire is corroded, and solve any problems in a timely manner.

5. Check each lead terminal, pin, grounding screw, and connecting bus screw. If there is any looseness, tighten it in a timely manner.

6. Clean the dust around the transformer and accessories, and check if the fire protection facilities and ventilation system are in good condition.