1050 Aluminum foils for transformer windings, composes of alloy 1050, commonly uses in the construction of transformer windings. Transformer windings consist of conductive material (aluminum or copper) that carries electrical current, and insulating material that electrically isolates different winding turns and layers.
The chemical composition of 1050 Series Aluminum Strip For transformer Winding is Al 99.5%, which has high conductivity and low price, and has become an indispensable material for power transformers.
The transformer 1050 aluminum foil is suitable for not only for low voltage dry type transformers, but also for oil immersed transformers and high voltage transformers.
The electrical conductivity of the 1050 aluminium foil strip is up to 61.0-63.0%, which meets the national standard and can meet the requirements of transformers winding under different voltages and frequencies.
High Conductivity, Cost Optimization, and Zero-Breakdown Reliability
(1060 Aluminum foil is well recognized, but if cost is considered, 1050 aluminum foil (Al ≥ 99.50%) is a very good solution for high-performance. It‘s very economical for low-voltage (LV) and medium-voltage (MV) dry-type tranformer coils:
Best Price & Performance Ratio: Similar electrical conductivity (at least 61.3% IACS) to 1060 grade, at a Raw material cost which makes it a more financially attractive option for total Transformer manufacturing cost.
Guarantees Burr-Free Edge Protection (± 0.005mm): The razor-sharp slitting burrs endanger the inter-layer insulation sheet (DMD, PET, Nomex ®). Our on-line active edge-chamfering rolling shape the foil edge to a arced profile that removes any puncture dangers.
Soft O-Temper with high Ductility (Elongation ≥ 25 % – 35 %): Fully annealed to O temper, sufficient plasticity for high tension automatic coil winding without edge cracking or web end deformation.
Oil-Free & Clean Surface (Dyne Level≥38dynes/cm}): with vacuum de-greasing and thermal treatments the surface will be 100% oily free and will give a perfectly wet table surface for resin encapsulation or vacuum pressure impregnation (VPI).
Dimensions of 1050 Aluminum Foils For Transformer Windings
| Thickness | Nominal Width | |||||
| ≤100 | >100–300 | >300–500 | >500–1250 | >1250–1650 | >1650–2000 | |
| Width Tolerance (+) | ||||||
| >0.20–0.60 | 0.5 | 0.6 | 1 | 3 | 4 | 4 |
| >0.60–1.00 | 0.5 | 0.6 | 1 | 3 | 4 | 4 |
| >1.00–3.00 | 0.5 | 0.6 | 1 | 3 | 4 | 4 |
Chemical Component :
| Elements | Si | Fe | Cu | Mn | Mg | Cr | Zn | Ti | Others | Al |
| % | 0.25 | 0.4 | 0.05 | 0.05 | 0.05 | – | 0.07 | 0.05 | 0.15 | 99.5 |
Mechanical properties :
| Temper | Tensile Strength (Rm/MPa) | Yield Strength (MPa) |
| 1050-O | 65-95 | Min20 |
| 1050-H12 | 85-125 | Min65 |
| 1050-H14 | 105-145 | Min85 |
| 1050-H16 | 120-160 | Min100 |
| 1050-H18 | Min135 | Min120 |
Precision Processing Technology
Burr-Free Rotary Carbide Slitting & Micro-Arc Edge Chamfering
Standard shear slitting will produce sharp micro-burrs. These microburrs will erode insulation when
Automatic shear slitting milling is an alternative method that does not produce a sharp edge, as shown:
Tungsten carbide slitting: The detail of and the process of Precision Rotary Cutter under the fixed closed loop tension control is Active Micro-Arc Edge Rounding: Secondary online mechanically polish edges into an arc radius (R >= t/2), one or more sharp corners possible.
Inline laser inspection An intrachip optical profile (also known as a inline laser inspection) guarantees the burr height stays at 0.005 mm.
Inert Gas Vacuum Annealing & Degreasing
To prevent coil delamination and partial discharge in resin-cast transformers:
Alloyed at 380 °C – 420 °C in a vacuum furnace with an inert atmosphere, so that the organic lubricant residue were evaporated.
100 Dyne Pen Tested: Ensures that there is enough surface energy in order 38 dynes/cm to allow a type of insulating varnish or epoxy resin to stick without dielectric bubbles.
Quality Control & Mill Test Certification (MTC)
All 1050 Transformer Aluminum Foils are supplied with full EN 10204 3.1 Mill Test Certificate:
Eddy current conductivity test: Confirmed to ASTM E1004 ( must be or better). Edge microstructure inspection: Using an optical microscope, burrs, tears, or micro-cracks are checked.
Tensile & Ductility Testing: Using a universal testing machine to confirme the tensile strength and elongation of the head/tail sample.
Export sea-worthy packing. Coils shall be wrapped with moisture-proof VCI film, silicates with silica gel desiccants and shall be fixed in wooden case with eye to sky or eye to wall arrangement.
Primary Industry Applications
Cast Resin Dry-Type Power Transformers (F-Class & H-Class Low-Voltage Windings)
Oil-Immersed Distribution & Power Transformers
Amorphous Alloy Core Transformers requiring high space fill factor
Low-Voltage Industrial Reactors & Solar/Wind Inverter Inductors
