Aluminum Strip for Dry-Type Transformers

 In power transmission and distribution, renewable energy supply, and industrial power distribution systems, dry-type transformers are increasingly replacing traditional oil-immersed transformers. Their core advantages—being oil-free, fire- and explosion-resistant, easy to maintain, and suitable for indoor environments—have made them essential power infrastructure components across various applications.

The soft aluminum strip for transformer is a specialized core material used to wind transformer coils, primarily for epoxy resin-cast dry-type transformers. It is compatible with the vast majority of mainstream models on the market, covering the full spectrum of high- and low-voltage specifications. Compared to oil-immersed transformers, dry-type transformers impose stricter requirements on the flexibility, electrical conductivity, and surface flatness of aluminum strips to accommodate the sealed casting and curing manufacturing processes.

I. Key Application Scenarios for Dry-Type Transformer Aluminum Strips

Market demand for dry-type transformer aluminum strips is concentrated in four key sectors: commercial buildings, solar power plants, data centers, and industrial facilities. Performance requirements for the strips vary significantly across these scenarios.

1. Commercial Buildings

Commercial buildings—such as shopping malls, office towers, and urban complexes—feature high population density and demand strict fire safety and maintenance-free operation, making them prime markets for dry-type transformers. With stable load profiles, these applications require aluminum strips that offer good flexibility, uniform conductivity, and oxidation resistance to ensure long-term, low-loss equipment operation.

2. Solar Power Plants

Photovoltaic power generation is characterized by intermittency and fluctuation, leading to frequent voltage and load surges. Specialized aluminum strips with high conductivity and fatigue resistance are required to enhance the transformer's overload and short-circuit resilience. This prevents winding degradation caused by frequent operational shocks and ensures stable power grid integration.

3. Data Centers

Data centers require uninterrupted 24/7 power supply, placing extreme demands on equipment reliability and energy efficiency. The use of high-precision, low-resistance, and low-loss aluminum strips effectively controls temperature rise, minimizes the risk of power supply failures, and ensures the stable operation of sensitive equipment.

4. Industrial Facility Scenarios

Industrial settings—such as chemical processing, metallurgy, and smart manufacturing—involve heavy loads, frequent mechanical shocks, and demanding operating conditions. High-quality aluminum strip with high strength, heat resistance, and corrosion resistance is essential. It ensures that transformer winding remain undeformed and cool during continuous, high-load operation, thereby extending the equipment's service life.

II. Mainstream Aluminum Alloys for Dry-Type Transformer Winding

Dry-type transformer winding utilize high-purity industrial aluminum strip (O-temper/soft annealed), offering a combination of high conductivity, ease of bending, and stable performance. The industry primarily employs four alloy grades—1050, 1060, 1070, and 1350—selected to suit specific operating conditions.

1. 1050 Aluminum Strip: Cost-Effective Choice

1050 EC grade aluminum strip (aluminum content ≥99.5%): Offers excellent cost-performance and formability. As a standard, general-purpose option, it is widely used in small-to-medium power transformers for commercial buildings and standard factory facilities, representing the highest market volume.

2. 1060 Aluminum Strip: Right for Most Conditions

1060 aluminum strip (aluminum content ≥99.6%): Features a balance of conductivity, strength, and corrosion resistance. With performance superior to the 1050 grade, it is suitable for most medium-to-high power commercial and industrial dry-type transformers and serves as a mainstream industry choice.

3. 1070 Aluminum Strip: High-Performance Option

1070 aluminum strip (aluminum content ≥99.7%): Characterized by high purity, low energy loss, excellent short-circuit resistance, low heat generation, and high stability. It is specifically designed for high-end, high-reliability power supply scenarios, such as data centers and photovoltaic power plants.

4. 1350 Aluminum Strip: High-Purity Option

1350 aluminum strip: A high-purity aluminum material dedicated to electrical applications. It offers top-tier conductivity and aging resistance with extremely low impurity levels, making it suitable for demanding, high-load conditions found in high-end precision transformers, high-power step-up transformers for new energy, and specialized industrial transformers.

Original source: https://www.alcustrip.com/a/aluminum-strip-for-dry-type-transformers.html