Power frequency transformers are basic equipment in power systems, operating at 50Hz/60Hz to undertake important tasks of power transmission and distribution. As the core winding material for power frequency transformers, soft aluminum foil has excellent electrical conductivity, good ductility, and cost advantages, widely used in distribution transformers, reactors, and other fields.
I. Technical Characteristics and Soft Aluminum Foil Requirements
1.1 Operating Characteristics
- Stable operating frequency: 50Hz/60Hz, single frequency
- Relatively stable load: Small load fluctuations
- Continuous operation: Usually long-term continuous operation
- Cost sensitive: Intense competition in distribution transformer market
- High efficiency requirements: Improving energy efficiency standards (SH15, S18)
1.2 Advantages of Soft Aluminum Foil
| Advantage | Description |
|---|---|
| Cost advantage | Aluminum price is about 1/3-1/4 of copper |
| Light weight | Aluminum density is about 1/3 of copper |
| Abundant resources | Aluminum reserves are abundant, stable supply |
| Easy processing | Good ductility, easy to form |
1.3 Core Selection Considerations
| Technical Points | Requirements |
|---|---|
| Conductivity | IACS≥34% |
| Ductility | Elongation ≥20% |
| Thickness Accuracy | Tolerance within ±3% |
| Surface Quality | Smooth, defect-free |
| Cost Effectiveness | Significant advantage over copper |
II. Technical Specifications
2.1 Recommended Grades
| Grade | Purity | Conductivity | Tensile Strength | Elongation | Application |
|---|---|---|---|---|---|
| 1060 | ≥99.60% | ≥35% IACS | 70-110 MPa | ≥15% | Standard |
| 1070 | ≥99.70% | ≥36% IACS | 65-100 MPa | ≥20% | High-Performance |
| 1050A | ≥99.50% | ≥34% IACS | 65-95 MPa | ≥20% | Economical |
2.2 Key Performance Parameters
Electrical: Conductivity ≥34 MS/m (IACS≥34%), Resistivity ≤0.0295 Ω·mm²/m
Dimensions: Thickness 0.3-3.5mm, Tolerance ±0.02mm, Width 20-600mm
Mechanical: Tensile strength 65-110 MPa, Elongation ≥15-25%, Hardness 25-45 HV
III. Process and Foil Matching
3.1 Winding Design Features
- Layer windings: Common layer structure
- Foil windings: High current low voltage, aluminum cost advantage
- Oil channel design: Inter-layer oil channels for heat dissipation
3.2 Temper Selection
| Winding Type | Temper | Elongation |
|---|---|---|
| Foil Winding | O | ≥20% |
| Layer Winding | O/H22 | ≥15% |
| High Voltage | H24/H26 | ≥12% |
3.3 Winding Parameters
Winding tension: 5-15 N/mm². Winding speed: 20-50 m/min. Annealing temperature: 300-500°C. Insulation class: Class F (155°C) or H (180°C).
IV. Industry Standards and Certifications
Standards: IEC 60325, GB/T 8544, JIS H4160, ASTM B373, GB/T 10937
Certifications: ISO 9001, UL, RoHS/REACH, SGS
V. Quality Inspection
5.1 Inspection Items
| Inspection | Method | Standard |
|---|---|---|
| Chemical Composition | Spectroscopy | Grade requirements met |
| Thickness Tolerance | Precision Gauge | ±0.02mm |
| Conductivity | Eddy Current | IACS≥34% |
| Surface Quality | Visual | No defects |
5.2 Common Defects and Prevention
| Defect | Prevention |
|---|---|
| Thickness variation | Optimize rolling process |
| Surface scratches | Careful handling |
| Oxidation | Sealed storage |
| Edge cracks | Control slitting process |
VI. Supplier Selection Recommendations
- Full-process production line
- Thickness control accuracy: ±0.02mm
- Width range: 20-600mm in stock
- ISO 9001 certified
VII. Product Specifications
| Grade | Thickness | Width | Temper | Conductivity |
|---|---|---|---|---|
| 1060 | 0.3-3.5mm | 20-600mm | O/H22/H24 | ≥35% IACS |
| 1070 | 0.3-3.5mm | 20-600mm | O/H22/H24 | ≥36% IACS |
| 1050A | 0.3-3.0mm | 20-600mm | O/H22 | ≥34% IACS |
Conclusion
The selection of soft aluminum foil for power frequency transformers requires focus on balancing conductivity, ductility, and cost-effectiveness.
Our company has 30 years of experience exporting electrical wire and metal foil. We provide 1060/1070/1050A series soft aluminum foil for power frequency transformers with customized sizes and global sample shipping.
Contact:
Email: office@cnlpzz.com
WhatsApp: 0086-19337889070
The technical parameters described are general reference values. Please consult our technical team for specific selections based on your power frequency transformer design requirements.