It is generally believed that copper has better electrical conductivity, higher mechanical strength, higher thermal conductivity and higher price than aluminium, which is also the fact that aluminium is more active and easy to be oxidized. Copper is used as transformer winding, so that the volume of the whole transformer is small and the installation position is saved. The most prominent is that the transformer's short-circuit resistance is stronger, that is to say, the dynamic stability and thermal stability of the transformer are also stronger. Of course, this is relative. Aluminum winding transformer can also ensure its dynamic and thermal stability to meet the requirements of national standards as long as it pays attention to this problem in electromagnetic calculation and structural design.


 
In fact, no matter the transformer uses copper or aluminium wires, the cross-sectional area of the core is the same, there will be no change. But the volume of transformer is a little different, the volume of aluminium transformer is relatively larger, and the volume of copper transformer is smaller.
 
Also, the cost is different, the price of aluminium winding transformer is low, the price of copper-wire winding transformer is high, and aluminium-wire transformer can save production costs.
 
Aluminum wire transformers generally use enameled wire 180 degrees, copper wire is good only 130 degrees, so copper wire transformers are easy to break down, those who say aluminium wire transformers are not good are generally old ideas do not keep up with the new era, foreign large enterprises such as ABB have been used more than a decade or two years ago, domestic enterprises are generally large enterprises reuse, because there are many technical problems generally small enterprises fundamentally understand. There will never be a lot of problems. Many people were afraid of using the aluminium wire transformer that technology did not keep up with before, and there are many problems. Now they shake their heads at the mention of aluminium wire transformer in China. But our society needs to improve. We have lagged behind ABB and other enterprises for more than ten or twenty years. We can't lag behind in the traditional feudal thinking. I don't know where the landlord bought it.