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Transformer copper foils uses the best electrolytic copper or special copper alloy as raw materials. Fully protect the electrical conductivity of the transformer copper foils, conductivity 97-102% IACS(international annealed copper standard value) used in the power industry high and low voltage transformer line dry type transformer, shallow sea, deep sea, long-distance multi-channel and microwave system communication cable. The narrow and thin belt with large roll diameter (the length can reach more than 2000 meters) and the width is greater than 600mm. It is similarly as application of enemeled copper wire.
The requirements of transformer copper strips are as follows:
1. Strip shape should be flat and true, allowing slight waves, strip side bending degree should not be greater than 2mm/m
2. Strip edge: cut edge, rounded edge, round edge
1) The cutting edge should be cut neatly, split edge and rolled edge, thickness ≥0.4mm, edge burr < 0.05mm; Thickness < 0.4mm; Edge burr < 0.03mm
2) Rounded corners, the edge should not be sharp, rough or protruding edge
Copper Foils For Transformer Winding Technical parameters
| Name | Copper Foils |
| Grade | Cu-ETP/C-11000/E -Cu58 |
| Temper | Soft(O),Hard(H) |
| Dimension | Thickness: 0.1-4.0mm; width: 20-1500mm |
| Standard | ASTM,EN 13599,GB-T 18813-2002 |
| Packing: In coil, Inner Diameter: 300mm, 400mm, 500mm, etc. | IEC, NEMA, GB, JIS |
The standard of Copper Coils
| INDUSTRY | USA | ITALY | CHINA | EURONORM | JAPANESE | |
| STANDARD | ASTM B5, B152 | UNI 5649 | GB/T | EN 1652 | DIN 1976 | JIS |
| C1100 | C11000 | Cu-ETP | T2 | CW004A | E-Cu 58 | C1100 |
Transformer Copper Foils Features
1. Super Thin, No Burrs and no scratch
2. Totally annealed
3. High strength
4. Above 99.80% IACS high electric conductivity
5. Excellent side camber 2mm/meter
The manufacturing process of transformer copper strips
it includes continuous up-casting, continuously extruded, milling face, rolling, welding, milling face, high annealing, rolling, low-temperature annealing, Cleaning and Passivation, aligning, cutting, chamfering, the main method by welding, the width for improving copper strips, meets the width requirement of transformer copper strips.
