Under normal operating and atmospheric conditions, a naturally cooled transformer requires almost no maintenance. A visual inspection of the transformer and the connections is sufficient. It is important to clean them occasionally (dust-free). The frequency of these inspections depends on the atmospheric condition of the room where the transformer is located.
In case of extremely polluting conditions (dust deposition) it may be necessary to clean the transformer. Dumping of dust or other waste on the insulating surfaces can be problematic. If the cooling is prevented, the transformer can overheat. In case of high humidity, the accumulation can also absorb moisture.
The best way to clean the EREA transformer is with a vacuum cleaner. Pressurized air (at low pressure) may also be used, but it should be ensured that the dirt is not blown deeper into the insulation.