Specification
aluminum wire for transformer winding
Source：Original
Editing：frank
Time：2020-08-03 16:26
The application of aluminium wire for transformer winding 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. In the case of the same cross section, aluminum is much lighter than copper. , The resistivity of the two at 20℃ is copper: 0.017241Ω·mm2/m; aluminum: 0.02801Ω·mm2/m. As long as the aluminum with a larger cross-section is selected, the same or even lower loss value as copper can be guaranteed . For epoxy resin cast dry-type transformers, since the coefficient of thermal expansion and contraction of aluminum is closer to that of epoxy resin than copper, the crack resistance of aluminum wire for transformer winding is better than that of copper winding. some. Moreover, since the mechanical strength of the dry epoxy resin casting winding itself is very good, there is no difference in mechanical strength between copper and aluminum.
Aluminum wire transformers can operate safely and reliably. As long as the aluminum wire transformer can withstand the requirements of heat resistance during 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 and the process must be adjusted accordingly, especially when the welding technology is advanced, it can achieve high temperature resistance (increased heat resistance) and low loss, and aluminum wire transformers will definitely be widely used. Users must also have the corresponding understanding. Users think that aluminum wire transformers have a high temperature and short life, and they dare not use them. However, users praise imported aluminum wire transformers, but worry about domestic aluminum wire transformers. There must be a unified understanding between the transformer factory and the user, and the promotion and application of aluminum wire transformers can proceed smoothly. Many transformer companies are already using aluminum wire or aluminum foil to produce transformers, especially epoxy cast dry-type transformers, whose aluminum wire for transformer winding is very common. The reason why our country has eliminated aluminum winding transformers is due to the small price difference between copper and aluminum in the 1980s and 1990s (less than 1:2, and now it is close to or more than 1:3). The external dimensions are small (because the conductor specifications are smaller than aluminum), the silicon steel sheet is relatively saved, and the previous aluminum winding welding technology is not good enough, so the aluminum winding transformer is clearly eliminated.
At present, various power-consuming departments have become accustomed to copper-winding transformers. Just because copper is more expensive than aluminum, it is believed that copper is better than aluminum. Therefore, manufacturers that use aluminum wire are cutting corners. As a result, transformer manufacturers are afraid of being misunderstood and dare not use aluminum windings. In fact, this is unfair. As long as the technical parameters of the transformer are consistent, the use of copper or aluminum in the windings is the same for customers. Of course, the manufacturer must clearly tell the user what material the winding uses when quoting.
Aluminum wire transformers can operate safely and reliably. As long as the aluminum wire transformer can withstand the requirements of heat resistance during 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 and the process must be adjusted accordingly, especially when the welding technology is advanced, it can achieve high temperature resistance (increased heat resistance) and low loss, and aluminum wire transformers will definitely be widely used. Users must also have the corresponding understanding. Users think that aluminum wire transformers have a high temperature and short life, and they dare not use them. However, users praise imported aluminum wire transformers, but worry about domestic aluminum wire transformers. There must be a unified understanding between the transformer factory and the user, and the promotion and application of aluminum wire transformers can proceed smoothly. Many transformer companies are already using aluminum wire or aluminum foil to produce transformers, especially epoxy cast dry-type transformers, whose aluminum wire for transformer winding is very common. The reason why our country has eliminated aluminum winding transformers is due to the small price difference between copper and aluminum in the 1980s and 1990s (less than 1:2, and now it is close to or more than 1:3). The external dimensions are small (because the conductor specifications are smaller than aluminum), the silicon steel sheet is relatively saved, and the previous aluminum winding welding technology is not good enough, so the aluminum winding transformer is clearly eliminated.
At present, various power-consuming departments have become accustomed to copper-winding transformers. Just because copper is more expensive than aluminum, it is believed that copper is better than aluminum. Therefore, manufacturers that use aluminum wire are cutting corners. As a result, transformer manufacturers are afraid of being misunderstood and dare not use aluminum windings. In fact, this is unfair. As long as the technical parameters of the transformer are consistent, the use of copper or aluminum in the windings is the same for customers. Of course, the manufacturer must clearly tell the user what material the winding uses when quoting.
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