FAQs of Aluminium Foil for transformer winding

Q1: Is an aluminium foil for transformer winding as reliable as a copper winding in the long term?

Yes, and in some cases, more so. Previously, the principal worry was the aluminum oxide layer.
However, advanced termination procedures, like cold pressure welding, result in airtight, stable, and highly conductive junctions.
Furthermore, the better thermal performance of foil windings slows the rate of insulation aging, potentially extending transformer life.

Q2: How are connections and terminations made to aluminum foil?

The most popular and dependable approach is cold pressure welding.
This procedure welds a copper or aluminum terminal straight to the foil using high pressure, resulting in a flawless, oxygen-free bond without the use of heat.
This procedure is better than mechanical crimping or bolting for assuring long-term connection integrity.

Q3: How important is the edge quality of the foil, really?

It's really crucial. A little, sharp burr on the foil's edge functions as a knife in the thin layer of interlayer insulation.
Mechanical vibrations and thermal expansion can eventually force this burr to penetrate the insulation, resulting in an inter-turn short circuit and catastrophic transformer failure.
Sourcing from a source who assures a smooth, rounded, burr-free edge is unquestionable.

Q4: Should I specify 1060 or 1350 alloy for my application?

For most conventional distribution transformers, 1060 alloy offers a perfect blend of conductivity and superior ductility for ease of winding.
Engineers prefer 1350 alloy for high-performance or specification-critical applications requiring maximum conductivity because it has been deliberately engineered and managed for use as an electrical conductor.

Aluminum Foils Strips For Transformers Specifications