Selection Guide for Aluminum Strip Used in Dry-Type Transformers
Aluminum strip is widely used in dry-type transformer windings due to its light weight, cost efficiency, and good electrical conductivity. However, choosing the right aluminum strip requires careful evaluation of alloy, temper, dimension, and surface quality. This guide covers all essential selection criteria.
Recommended Alloys
- 1060 or 1070: High purity aluminum (≥99.6%), excellent conductivity and flexibility
- 1350: Specially used in power transformer applications, conductivity up to 61% IACS
Temper and Mechanical Properties
The most common temper is O (annealed), which provides softness for tight winding without cracking. It also improves bonding with insulation materials and reduces internal stress during coil manufacturing.
Thickness & Width Range
- Thickness: Typically 0.2mm to 3.0mm, depending on the winding layer and voltage grade
- Width: Customizable from 10mm up to 800mm
- Tight tolerance control is important for even layering and magnetic symmetry
Surface Quality & Edge Treatment
The aluminum strip should have a clean, burr-free, and smooth surface. Edge options include:
- Round edge: Safer for insulation layer, reduces corona discharge risk
- Slit edge: Cost-effective, suitable for less critical applications
Insulation Compatibility
The strip must bond well with epoxy resin, NOMEX paper, or polyester film. Pre-treatment or degreasing may be required before winding to ensure insulation performance.
Coil Packing & Handling
Export coils are packed with moisture-proof layers and protective wooden or steel pallets. Ensure coils remain dry and damage-free during transit to avoid oxidation.
Choosing the right aluminum strip ensures your transformer has high efficiency, safety, and service life. Our factory offers custom specs, short lead times, and global delivery. Contact us today for a free sample and technical consultation!
