its iron core adopts multi-step stepping lab-type technology, the laminated piece adopts 45º oblique seam hole-free bandage structure, silicon steel sheet adopts advanced longitudinal and horizontal shear cutting, cutting mouth burr is not than 0.001 inches . The iron core adopts high-strength PET polyester banding design, clip structure adopts plate clamp pieces thus reducing spurious loss. The iron yoke clamp-er adopts a unique clamping banding process, fully guarantees the iron core’s clamping degree.

The transformer's high, medium, low and voltage-regulating coil shall wound on an insulating paper tube. Low-voltage winding mainly adopts spiral structure with axial oil passage. High and medium voltage winding are made by composite wire wire wrapped by highstrength DENNISON paper, which is imported from the U.S. That can greatly increase the filling coefficient of transformer’s steel window, reduce the wire’s eddy current loss and circulation loss and also improve the anti-short circuit capacity of the transformer. There are locking stays inside and outside the winding.

The body insulation structure and winding process are completed in a fully sealed clean workshop, can meet the cleanliness requirements and constant body temperature requirements for high voltage, ultra-high voltage transformers and further ensure the cleanliness and dryness of transformer body. Meanwhile, kerosene vapor-phase drying equipment is used to further ensure cleanliness of the body.