Full-sealing transformer with 35kV and below has low loss and noise, strong anti-short circuit ability and high operation reliability, the iron core adopts the multilevel-type 45°full-inclining joint overlapping method. The product could meet the special usage requirements of metallurgy, petrochemical system and in humid and filthy area after its surface is removed the rust and oil and conducted the phosphating. The oil tank is in ripple type or in cooling fin type, and adopts the fully sealed oil tank and selected components to insure the safe operation of transformer. The product has beautiful appearance and small volume, which could reduce the floor space, so it's ideal free-maintenance high-quality product of users.