Specification of transformer aluminium strip
The transformer aluminium strip is in accordance with the following items below:
l Denomination: transformer aluminium strip
l Alloy: 1050, 1060, 1070, 1350 Temper: 0
l Standards applicable:
The transformer aluminium strip is in accordance with conditions specified on this specification and, fo lacks on this procedure it is in accordance with standard EN 10204-3.1.b
l The applicable dimension of coil shall conform to table 1.
Table1 Unit: mm
| Thickness | 0.2 to 3.0 |
| Width | 10 to 1250 |
Ø Characteristics and properties
The coils of aluminum foil is produced in high pure aluminum (99.7%) and is in accordance with the following items:
Table 2 Unit: Weight%
| Si | Fe | Cu | Mn | Mg | Cr | Zn | Ti | Others | Al. | |
| Individual | Total | |||||||||
| Max. 0.20 |
Max. 0.25 |
Max. 0.04 |
Max. 0.03 |
Max. 0.03 |
— |
Max. 0.04 |
Max. 0.03 |
Max. 0.03 |
— | Min. 99.7 |
l Thermal treatment:
The typical Brinell hardness for the material must determinate after annealing process( Hardness Brinell Typical: 18HB).
l Surface finish
l The transformer aluminium strip surface is flat, smooth, polished with MILL-FINISH. The maximum roughness absolute is from 5-7 micron inches.
l The transformer aluminium strip should not present wrinkles, folds, scratches, deformations and specially, on the edges, do not must have burr, scratches or others factors which could harm the isolation material to be assembled over this material. The material is free from any type of damages.
l The transformer aluminium strip surface is free from any impurity, as greases, liquid detergents, powdered metals, incrustations and others, and particularly do not should present chemical products used during pickling process.
Moreover, if used at the final stage, backing antioxidant surface, as a film form, it is chemically compatible with the electric fluids used in transformers and step voltage regulators.
l Edge(ends) shapes
The edge finishing of the transformer aluminium strip shall meet the requirements of the figures below, and the quality level decrease from A to D. The “D” format is the minimum acceptable quality.
ALUMINIUM ACCEPTABLE SHAPES OF THE FOIL EDGES
ALUMINIUM NOT ACCEPTABLE SHAPES OF THE FOIL EDGES
l Waves and lateral curvature
In rolled transformer aluminium strip will not be allowed bending and lateral undulations.
The tolerance of lateral curvature of strip is according table 5( see figure below).
l Amendment
In the same coil, amendments are not acceptable.
