Alcutrans supplies Continuously Transposed Cable (CTC), a specialized winding conductor composed of multiple enameled rectangular aluminum wires. These wires are precisely arranged in two columns and continuously transposed using advanced processing technology. The individual rectangular strands, typically insulated with PVF (polyvinylformal) enamel, are combined with specialized insulating materials to form a compact rectangular conductor assembly. Widely used as winding wire in power transformers, CTC ensures efficient performance and reliability in demanding electrical applications.

Structural Configuration
CTC construction varies to match different transformer winding diameters and application requirements.

• Number of Enameled Conductors: 5 – 73 strands
• Strands may be arranged in odd or even configurations
• Configurations are available in different lengths to suit specific transformer designs

Technical Specifications

• Conductor Material: Aluminum
• Thermal Class Options:
  • Class H – 180°C
  • Class E – 105°C
• Single Conductor Dimensions:
  • Thickness (a): 0.90 – 3.15 mm
  • Width (B): 2.50 – 13.00 mm
  • Tolerance: ± 0.01 mm
• Overall CTC Maximum Dimensions:
  • Height: 120 mm
  • Width: 26 mm
  • Tolerance: ± 0.05 mm
• Width-to-Thickness Ratio of Single Conductor:
  • 2.0 < B/a < 9.0
• Enameled Wire Coating Thickness: 0.08 – 0.12 mm

Performance Advantages

• Cost Efficiency
  CTCs can be utilized in smaller and more economical transformer designs. The thin insulation layer helps reduce space requirements for windings, contributing to overall system cost reduction.

• Improved Handling & Winding
  The transposed structure enhances winding performance. It simplifies operation for both machinery and operators, allowing faster and more efficient winding processes.

• Reduced Electrical Loss
  CTCs help minimize transformer electrical losses. They support faster winding times and contribute to lowering eddy current losses, particularly at the winding ends.

• Optimized Heat Distribution
  The improved insulation and structured spacing enable more uniform heat distribution across the winding, helping maintain overall equipment performance.

• Enhanced Mechanical Strength
  Continuously Transposed Cables, including self-bonding types, provide improved mechanical strength compared to alternative conductor solutions.

Application Areas
Continuously Transposed Conductors are used in:

• Medium power transformers
• Ultra-high power transformers
• Electrical equipment
• Transmission and distribution centers
• Military and defense applications