Definition of 1350 O Aluminium Foil for Transformer Winding
1350 O aluminium foil is a high-purity annealed soft aluminum conductive material specially developed for the low-voltage winding of power transformers, reactors, inductors and other electrical equipment. The grade 1350 stands for wrought aluminum alloy with minimum aluminum purity of 99.50%, while the "O" temper represents fully annealed processing. Through high-temperature annealing, internal rolling stress inside the aluminum strip is completely eliminated, endowing the material with high ductility, uniform mechanical properties and stable electrical conductivity. It has gradually become the mainstream alternative to copper winding materials in the transformer industry, widely adopted by manufacturers of dry-type transformers, oil-immersed transformers, box-type substations and new energy power equipment, balancing production cost, processing efficiency and equipment operational safety.
Detailed Chemical Composition of 1350 Alloy Aluminium Foil
1350 aluminum alloy implements strict impurity control standards to guarantee consistent conductivity batch by batch, which is the core reason why it is preferred over 1060 series for large-capacity power transformers.
Core Advantages of 1350 O Aluminium Foil for Transformer Winding
Stable high conductivity: Low winding DC resistance reduces transformer load loss and no-load loss, conforming to international energy-saving transformer design standards.
Excellent ductility of O temper: Adapts to fully automatic high-speed winding equipment, coils are wound tightly and neatly, effectively reducing manual adjustment and rejection rate.
Remarkable cost advantage: Aluminum raw material price is much lower than copper; under the same current-carrying capacity, the overall manufacturing cost of transformer windings can be reduced by 30%~50%.
Uniform heat dissipation & anti-corrosion: High-purity aluminum has uniform thermal conductivity to avoid local hot spots; dense natural oxide film provides good corrosion resistance, suitable for coastal, humid and outdoor operation environments.
100% recyclable & eco-friendly: Aluminum can be recycled repeatedly with low energy consumption, complying with RoHS, ISO9001 and other global environmental certification requirements.
Main Application Scope
Low-voltage side winding of cast resin dry-type distribution transformers
Low-voltage coil for oil-immersed power transformers and box-type substations
Reactors, current transformers, filter inductors supporting photovoltaic and wind power generation systems
Rectifier transformers, industrial frequency conversion transformers and large power inductive equipment
Conclusion
1350 O aluminium foil has become the designated conductive material for transformer low-voltage winding relying on stable electrical performance, reliable mechanical ductility and standardized production process. Reasonable confirmation of alloy grade, temper, size tolerance and edge treatment is the premise to guarantee long-term safe and stable operation of transformers.