10kV series, capacity range 30-3150kVA distribution transformer products. The iron core uses high-conductivity grain-oriented silicon steel sheet. The core column stacking adopts the oblong stacking method. Compared with the circular core column stacking method, the length of the iron yoke can be reduced. The iron yoke stacking of the iron core adopts the stepped stacking method. Compared with the circular iron yoke stacking method, the angle weight of the transformer core can be reduced, thus reducing the total weight of the iron core.The high and low voltage windings adopt the unified winding process scheme to improve the ampere-turn balance, reduce the axial short circuit force and simplify the winding compaction structure. The performance of the transformer conforms to European energy efficiency standards and Chinese energy efficiency standards. This series of distribution transformers has a series of advantages, such as low no-load loss, energy saving, convenient maintenance, low noise and strong environmental protection effect. It is the upgrading product of the current old series of distribution transformers.