EN AW 1070 Aluminum Windings for Transformers

EUROLAB laboratory provides testing and compliance services within the scope of EN AW 1070 standard. The aluminum foil transformer is an important value engineering breakthrough in the industry. Conventional copper wire is replaced by aluminum foil in the transformer coil. It helps increase reliability and also reduces the total material cost by 15 to 20 percent.

Copper shows low creep. Under the overload and temperature conditions of distribution transformer windings, the creep rates of aluminum can be 25 times higher than copper. This results in aluminum-wound distribution transformers that have a higher failure propensity than those with copper windings.

Copper wires do not have a galvanic effect because they are the same element as connectors, which are usually made of copper or brass (an alloy of copper). Aluminum loses material through the galvanic effect, resulting in loss of contact.

Copper-wound distribution transformers are always smaller and lighter than aluminum-wound ones of equivalent capacity and energy performance. Since the resistivity of copper is 0,6 times that of aluminum, the cross section of the aluminum conductor must be 1,66 times larger than that of the copper conductor for the same resistance.

This results in a larger transformer core and volume, resulting in a larger transformer tank than the copper design. While aluminum is lighter than an equal volume of copper, in distribution transformers this advantage disappears with the increased volume (and therefore weight) of the conductor, steel core, tank and oil.

EUROLAB assists manufacturers with EN AW 1070 test compliance. Our test experts, with their professional working mission and principles, provide you, our manufacturers and suppliers, the best service and controlled testing process in our laboratories. Thanks to these services, businesses receive more effective, high-performance and quality testing services and provide safe, fast and uninterrupted service to their customers.