Protection methods for dry-type transformers

IP20 protective casing is usually used to prevent solid foreign objects with a diameter greater than 12mm and small animals such as mice, snakes, cats, and birds from entering, causing malignant faults such as short circuits and power outages, providing a safety barrier for live parts. If the transformer needs to be installed outdoors, an IP23 protective casing can be selected. In addition to the IP20 protection function mentioned above, it can also prevent water droplets from falling within a 60 ° angle with the vertical line. But the IP23 shell will reduce the cooling capacity of the transformer, so attention should be paid to the reduction of its operating capacity when selecting.