Aluminum Foil for Dry Transformer Winding

Dry-type transformers rely on air convection for cooling. Dry-type transformers are widely used in local lighting, high-rise buildings, airports, docks, CNC machinery and other places. Its cores and windings are not immersed in insulating oil. The cooling methods are divided into natural air cooling (AN) and forced air cooling (AF).

From an economic point of view, the economic efficiency of aluminum in transformer windings depends on the price ratio of aluminum and copper. For transformers less than 2.5 MVA, aluminum windings are more economical than copper windings. In fact, 90% of the transformer capacity in the world is less than 2.5 MVA.

Aluminum foil for transformer is 1xxx high-purity aluminum foil. Generally the aluminum grades are 1070, 1060 and 1050 aluminum alloy. The product has strict requirements on parameters such as alloy composition, conductivity,edge quality, and surface flatness. The excellent quality of aluminum foil ensures the stability of various performances of dry-type transformers and guarantees the cost-effectiveness of products after replacing copper foil.

When foil winding, the aluminum foil must be stretched to maintain a certain tension and be wound into a winding coil smoothly and flatly. The thicker the aluminum foil, the greater the tension required. The maximum tension of the foil winding machine is limited. It is dangerous to exceed the maximum tension of the machine. If the tension is too small, the wound coil will be too loose and cannot meet the size requirements.

Therefore, this is not to say that you have to increase the thickness of the 1070 aluminum foil, because transformer designers can comprehensively consider the thickness, cross-section, current density, temperature rise, etc. of the aluminum foil, rather than simply adjusting the thickness to design and calculate the winding characteristics of the transformer.

Specification:

Alloy: 1060-O, 1050, 1050A, 1070, 1070A, 1350

Application: Aluminum foil for dry-type transformers, aluminum strip for transformers

Thickness: 0.2mm--3.0mm

Width: 20mm-1650mm

Packing: wooden pallet, inner diameter 300mm or 500mm.

Resistivity is less than or equal to 0.028.