The conventional transformer adopts a transformer (oil- […]
The conventional transformer adopts a transformer (oil-immersed transformer) in the form of a wire winding structure, and a transformer (dry-type transformer) in the form of a foil-winding structure wound from a pure copper strip has:
1.Extremely high dynamic and thermal stability, especially in the short circuit state;
2.High space utilization, simple manufacturing process, automatic winding, easy to realize mechanized production, high winding efficiency;
3.The heat distribution is uniform, the volume is small, the weight is light, the capacity is large, the material is saved, the energy saving effect is good, and the no-load loss is small;
4.Good heat dissipation performance, easy welding, no axial force, long service life, no pollution, lifetime maintenance-free and many other advantages, has been widely used in the transmission and distribution project, and will gradually replace the transformer of the wire winding structure.
Correspondingly, the copper strip used for the high-voltage winding is called the high-voltage belt, and the copper strip used for the low-voltage winding is called the low-voltage belt. At present, there are dry-type transformers with high-low voltage sides on both sides, and high-voltage side copper wires. Dry-type transformer with copper strip on the low-voltage side. In addition, the low-pressure side of the oil-immersed transformer is also wound with copper.
Foreign transformer copper strips basically use oxygen-free copper. Due to the limitation of production capacity and the requirement of lowering the manufacturing cost, it is common to use ordinary copper, but it is strict for some impurity elements such as Fe and P which significantly affect the conductivity. Control to ensure the electrical conductivity of the product.