Distribution transformers normally have ratings

Distribution transformers normally have ratings less than 200kVA electrical transformer, although some national standards can describe units up to 5000 kVA as distribution transformers,but with the same effect 2000 kva transformer of Farady。Since distribution transformer is energized for 24 hours a day (even when they don't carry any load), reducing iron losses has an important role in their design. As they usually don't operate at full load, they are designed to have maximum efficiency at lower loads. To have a better efficiency, voltage regulation in these transformers should be kept to a minimum. Hence they are designed to have small leakage reactance.