Copper or Aluminum for Low Voltage Dry Type Transformer

low voltage transformer

While numerous specialists contend the particular advantages and disadvantages of involving copper or aluminum in dry-type transformers, it is vital to comprehend that advancements in transformer configuration have guaranteed that both of these two materials can today be applied with equivalent impact in many applications.

There is obviously an expense benefit to choosing aluminum as a channel, as the product’s value will in general be fundamentally more affordable than copper, and more steady after some time. It is thus not unexpected that over 80% of transformer creation throughout the course of recent years – across all markets and applications – consolidates aluminum windings.

Using Copper or Aluminum for Low Voltage Dry Type Transformer

dry-type transformerNonetheless, the contention is at times made that aluminum is substandard as far as conductivity – as it has just 61% of the conductivity of copper – prompting higher energy misfortunes. Winding temperature is, obviously, consistently a worry, however, power transformer manufacturers have had the option to keep up with temperatures beneath the protection rating by planning aluminum twisting transformers with conduits with bigger cross-sectional regions than those made of copper.

The expense of copper base metal has generally been demonstrated to be substantially more unpredictable than the expense of aluminum, with the goal that the price tag of a copper channel by and large is the most costly decision.

Additionally, on the grounds that aluminum has more prominent flexibility and is more straightforward to weld, it is the cheaper assembling decision for any step-up transformer. In any case, dependable aluminum connections require more discipline and mastery with respect to transformer installers than that required for copper associations.

Technical arguments about the advantages and disadvantages of aluminum versus copper have been exchanged this way and that in the electrical business for a long time. The majority of these arguments are irrelevant and some can be arranged just as deception. The motivation behind this Application Brief is to examine a few normal worries with respect to the decision between these two winding materials.

It is likewise contended that the heat conductivity of copper is better than that of aluminum in diminishing problem area temperature ascend in transformer windings. In any case, this is valid just when copper and aluminum windings of indistinguishable size, calculation and configuration are thought about for dry-type transformers.

Conductivity differences in copper and aluminum

For some random transformer KVA sizes, the warm conductivity attributes of aluminum can be exceptionally near those of copper. For aluminum coils to accomplish a similar current-conveying limit as copper, the aluminum loop should be roughly 66% bigger in its cross-sectional region.

Dependable power transformer manufacturers plan and test the problem area qualities of their plans and use cooling surface region, coil geometry, air ducting, and guide shape to deliver OK problem area inclinations paying little mind to winding material.

Transformer producers limit the assortment of guide sizes loaded. Along these lines, a few plans in an aluminum can get lower losses than copper basically in light of the fact that the decision of wire size is restricted. In different designs, copper is more productive.

Hardly any low voltage dry-type transformers makers change the outline size of the center when changing from aluminum to copper, so center loss remains generally comparable no matter what the winding material. On the off chance that equivalent productivity can be acquired by fluctuating the wire size and center losses continue as before, there is not a great explanation to anticipate that one design should be more proficient than the other.


The cost differential between copper and aluminum can frequently make it conceivable to give bigger aluminum conductors, which brings about lower load losses at less expense than if copper conductors were utilized.

The superior cost for copper regularly requires justification, yet these contentions have been disproved. In truth, industry experience essentially doesn’t uphold any of the regularly expressed purposes behind picking copper over aluminum. Aluminum-twisted low voltage step-up transformers will most likely keep on acquiring expanded acknowledgment due to their massive expense advantage over copper.

In any case, great practices when making electrical connections are a benefit to everybody in the business, whether or not aluminum or copper is being utilized. Prior to putting resources into the extra expense of copper transformers, look at the purposes behind copper inclinations in the detail. Contact us today to learn more about industrial transformers, or inquire about transformer products.