What is the differences between copper transformer and alu. Transformer

Transformer according to the winding material can be divided into two kinds of copper wire winding transformer and aluminum wire winding transformer, then copper winding and aluminum winding transformer what is the difference?

What is the difference between copper transformer and aluminum transformer?
First, performance is different
1, copper winding transformer: good electrical conductivity, high mechanical strength, high thermal conductivity, high price.
2, aluminum winding transformer: aluminum resistivity is large, poor strength, low price.
Second, different characteristics
1, copper winding transformer: The most prominent is that the transformer's short-circuit resistance is strong, that is, the transformer's dynamic stability and thermal stability are also strong.
2, aluminum winding transformer: aluminum is more active, easy to be oxidized.
Three, the size is different
1, copper winding transformer: copper wire transformer volume should be small.
2, aluminum winding transformer: aluminum winding transformer volume is relatively large.

Copper transformer or aluminum transformer?
In order to save costs can buy aluminum winding transformer. Of course, after the end of the life of the transformer, the residual value of the aluminum transformer is also lower than that of the copper transformer, and the residual value of the copper transformer may be higher than when you buy it if the copper price fluctuates greatly.

In fact, whether the transformer uses copper wire or aluminum wire, the cross-sectional area of the iron core is the same, and there will be no change. There is only a little difference in the volume of the transformer, the volume of the aluminum transformer is relatively large, and the volume of the copper transformer is smaller.

General purpose residential lighting transformers, and even some transformers containing a class of load, can completely use aluminum coil power transformers. The benefits are self-evident. What we are concerned about is the duty cycle factor of its winding, winding strength, short-circuit resistance and overcurrent resistance, weather resistance index, outlet oxygen index and so on. The aluminum winding transformer used over the years is not wrong, but the oil-immersed type is more rare than the dry type.