First, check the cleanliness of the casing and magnetic skirt and clean it in time to keep the magnetic casing and insulator clean to prevent flashover.
Second, when the cooling device is running, check that the butterfly valves of the oil inlet and outlet pipes of the cooler are in the open position; the air inlet of the radiator is unobstructed, and the inlet is clean and free of debris; check that the submersible pump rotates correctly, and there is no abnormal noise or obvious vibration during operation; the fan The operation is normal; the automatic switch of the branch power supply in the cooler control box is closed well, and there is no vibration or abnormal sound; the cooler has no oil leakage.
Third, ensure that the electrical connection is tight and reliable.
Fourth, check the tap changer regularly, and check the tightness, burns, scars, rotation flexibility and contact positioning of the contacts.
Fifth, the coil, bushing and arrester of the transformer should be inspected every 3 years.
Sixth, check the grounding reliability of the arrester every year. The grounding of the arrester must be reliable, and the lead should be as short as possible. The grounding resistance should be tested during the dry season, and its value should not exceed 5 Ω.
Seventh, replace the desiccant and oil bath oil of the respirator. Eighth, regularly test fire-fighting facilities.
The above is the daily maintenance work of the transformer.