Continuously Transposed Cable (CTC) without paper insulation is a winding conductor formed by weaving a defined number of enameled rectangular aluminum strips into two parallel ranks according to specific technical requirements.

The assembled conductors are wrapped using special insulating materials such as insulation paper, rope, or tape, depending on application needs. This structured transposition improves electrical and mechanical performance in transformer windings.

Design & Configuration

• Transposition Number: 5 – 80 strands
  (Odd or even configurations optional)
• Built from enameled rectangular aluminum conductors arranged in two ranks
• Designed to meet specific winding and insulation requirements

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
• Width-to-Thickness Ratio:
  • 2.0 < B/a < 9.0
• Enameled Coating Thickness:
  • 0.08 – 0.12 mm
• Maximum Overall Dimensions:
  • Height: 120 mm
  • Width: 26 mm
  • Tolerance: ± 0.05 mm

Operational Benefits

• Improved Space Utilization
  The use of transposed conductors enhances the winding space utilization ratio, resulting in more compact transformer designs.

• Reduced Volume & Cost
  By optimizing the winding structure, transformer size and overall production cost can be reduced.

• Lower Electrical Losses
  CTC windings help decrease additional circulation and eddy current losses caused by leakage magnetic fields.

• Enhanced Mechanical Strength
  The transposed structure improves the mechanical stability of the winding.

• Time-Saving Installation
  Winding time is reduced due to the improved configuration and handling characteristics.

Application Areas
CTC winding without paper insulation is used in:

• Medium power transformers
• Ultra-high power transformers
• Large-scale oil-immersed power transformers
• Reactors
• Large-capacity dry-type transformers
• Electrical equipment systems

Packing Specifications

Standard Spool Details