Protection Methods
IP20 protective enclosures are typically selected to prevent solid foreign objects larger than 12mm in diameter and small animals such as rats, snakes, cats, and birds from entering, causing short circuits and power outages, thus providing a safety barrier for live parts. If the transformer must be installed outdoors, an IP23 protective enclosure can be selected. In addition to the above IP20 protection functions, it can also prevent water droplets from entering at an angle of up to 60° to the vertical. However, IP23 enclosures will reduce the transformer's cooling capacity; therefore, the reduction in operating capacity should be considered when selecting one.
Overload Capacity
The overload capacity of a dry-type transformer is related to the ambient temperature, the load conditions before overload (initial load), the transformer's insulation and heat dissipation, and the heating time constant. If necessary, the overload curve of the dry-type transformer can be obtained from the manufacturer.