High-Conductivity Aluminum Strip for Transformer Winding

In the field of power transformer manufacturing, aluminum strip has long been the core conductive material for windings due to its core advantages of high conductivity, lightweight, and excellent cost-effectiveness.

Currently, the most widely used transformer aluminum strips in the industry are mainly four grades: 1050, 1060, 1070, and 1350. All belong to the industrial high-purity aluminum series, emphasizing high conductivity, but their parameters, performance focuses, and applicable scenarios differ. How to choose?

I. Analysis of the Four Grades

1. 1050 Transformer Aluminum Strip

1050 aluminum strip is an entry-level transformer conductive aluminum material with an aluminum purity ≥99.5%, representing the basic purity among the four grades. Its standard conductivity is ≥60% IACS, fully meeting the basic requirements of national standard transformer conductive materials. It exhibits stable conductivity with no significant conductivity attenuation issues.

Due to purity limitations, the conductivity of 1050 aluminum strip is at a basic level among the four. Its advantages lie in its extremely high cost-effectiveness, uniform material, good formability, and resistance to cracking and deformation during winding processing.

It is suitable for conventional small and medium-sized distribution transformers and general-purpose low-voltage transformers with less stringent energy consumption requirements, it is a mainstream economical choice for ordinary civilian power equipment, ensuring basic conductivity and heat dissipation while controlling production costs.

2. 1060 Transformer Aluminum Strip

1060 aluminum strip is the most widely used general-purpose model in the transformer industry. With an aluminum purity ≥99.6%, it represents a slight improvement in purity compared to 1050, while significantly reducing impurities. It corresponds to a stable conductivity ≥61% IACS, exhibiting superior conductivity compared to 1050, resulting in lower power transmission losses and less heat generation.

The biggest core advantage of this grade is its ultimate balance between conductivity, mechanical properties, and cost. It not only improves conductivity but also retains excellent plasticity and weldability. After annealing, the 1060 aluminium strip is flexible and suitable for most conventional transformer winding processes, including oil-immersed and dry-type transformers.

It addresses the weakness of 1050strip's conductivity while offering better cost-effectiveness than high-purity aluminum strip, making it widely applicable to medium and low-voltage distribution transformers and general-purpose industrial power transformers. 1060 alloy price is also much cheaper than 1070 or 130 aluminum strip. It is a versatile option that balances quality and cost.

3. 1070 Transformer Aluminum Strip

1070 aluminum strip is the highest purity aluminum material among the four grades, boasting superior conductivity. With an aluminum purity ≥99.7% and impurity content controlled to industry-leading standards, it minimizes electrical resistance. Its conductivity ≥62.7% IACS is the highest among the four grades, exhibiting extremely low conductive loss and optimal power transmission efficiency.

This superior conductivity makes 1070 aluminum strip the preferred material for high-end transformers, effectively reducing transformer load losses, minimizing operating heat generation, and improving overall equipment energy efficiency. Simultaneously, its excellent toughness makes it resistant to breakage and cracking during high-speed winding and precision molding.

It is suitable for high-end applications with stringent energy efficiency and stability requirements, such as new energy transformers, high-voltage power transformers, and high-precision energy-saving transformers, making it a core material for low-loss transformer manufacturing.

4. 1350 Transformer Aluminum Strip

1350 is a special conductive aluminum grade for the power industry, specifically designed for power transmission and transformation, and transformer conductivity applications. Its aluminum purity is comparable to 1060 grade, with a stable conductivity of ≥61% IACS. While its conductivity performance is on par with 1060, its conductivity stability has been specifically optimized.

Compared to general-purpose aluminum strips, 1350 aluminum strip has strict control over harmful conductive impurities, resulting in stronger conductivity uniformity. It exhibits no issues such as localized high resistance or abnormal heating during long-term operation, demonstrating superior conductivity durability. It is specifically suited for high-power power transformers, main transformers in power transmission and transformation, reactors, and other power equipment operating continuously for extended periods.

Its main features are long-term high conductivity stability, aging resistance, and low attenuation, making it a dedicated high-conductivity aluminum material for industrial-grade high-power transformers.

II. Summary of Core Comparison of Conductivity Performance of the Four Major Grades

Ranked by conductivity performance level: 1070 (≥62.7% IACS) > 1060 = 1350 (≥61% IACS) > 1050 (≥60% IACS).

Choose the right model for your specific needs: 1070 for high-end equipment that prioritizes energy efficiency; 1060 for general operating conditions and balanced cost-effectiveness; 1050 for economical conventional equipment; and 1350 for high-power, long-term stable power-specific equipment.

Original source: https://www.alcustrip.com/a/high-conductivity-aluminum-strip-for-transformer-winding.html