The copper strip used for the high-voltage winding is c […]
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, the dry-type transformer with the copper strip wound on both the high and low voltage sides is used, and the high-voltage side copper wire and the low-voltage side are also used. Dry transformer with copper strip. 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.
Copper process for transformers
There are two ways to produce transformer strip products:
Semi-continuous or full continuous casting (or iron casting) - hot processing production mode and horizontal continuous casting - zero processing production mode. The former is a mature process and is suitable for large-scale production.
The foreign advanced transformer strip production process is: high-efficiency production mode of large-size, continuous casting and large-process rolling, and the weight of a single ingot can reach 25 tons. Due to the high quality requirements of transformer strips, advanced technology and equipment should be used to ensure product quality.
Transformer copper strip specifications and status
Specifications: 0.1~2.5*14~1200, where the narrow strip is generally used for the high side and the broadband is used for the low side.
At present, the national standard for copper strips for transformers is GB/T 18813-2014.