The application of aluminum electromagnetic wires in transformers is very common in European and American countries, because the price of aluminum is much cheaper than copper, and the density of aluminum is much smaller than copper. Under the same cross-section, aluminum is much lighter than copper. The resistivity at 20 ℃ is copper: 0.017241Ω · mm2 / m; aluminum: 0.02801Ω · mm2 / m, as long as the aluminum material with a larger cross-section is selected, it can guarantee the same or even lower loss value as copper.
 
For epoxy resin cast dry-type transformers, since the coefficient of thermal expansion and contraction of aluminum is closer to that of copper than that of copper, the resistance of aluminum windings to cracking is better than that of copper windings. And because the mechanical strength of the dry epoxy casting winding itself is very good, the difference in mechanical strength between copper and aluminum is gone.


 
aluminium electromagnetic wire transformer winding can operate safely and reliably.
 
IEC standards and national standards do not exclude aluminum as a conductor. In GB1094.5-2008 item 4.1 and IEC60076-5: 2006, the provisions and calculation methods for the heat resistance of copper windings and aluminum windings to withstand short circuits are given. And related parameters, from which it can be analyzed that aluminum conductors can be used as transformer conductors.
 
As long as the aluminium electromagnetic wire transformer winding can withstand the requirements of heat resistance under short-circuit current, and can withstand the dynamic stability requirements of mechanical force during short-circuit, it is qualified.
 
As long as the design is reasonable, the process must also be adjusted accordingly, especially in the technical welding of the early welding, which can achieve high temperature resistance (improved heat resistance level) and low loss,aluminium electromagnetic wire transformer winding will be widely used. Users should also have a corresponding understanding. Users believe that the temperature of aluminum wire transformers rises and the life is short, so they dare not use them. However, users are full of praise for imported aluminum wire transformers, but they are worried about domestic aluminum wire transformers. The transformer factory and the user must have a unified understanding, and the promotion and application of aluminum wire transformers can be carried out smoothly.