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Continuously Transposed Conductor (CTC)
Continuously Transposed Conductor (CTC)
Continuously Transposed Conductor (CTC) consists of a group of enamelled rectangular strips, PVA or PVA epoxy with bonding layer type which are connected up parallel to the ends. In this group each strand successively and repeatedly takes on every possible position inside the conductor cross section.
Strands as a whole are wrapped with pure cellulose paper tapes (Diamond dotted epoxy paper, Cindus, Dennison, Kraft & Crepe Paper) for manufacturing low loses winding for electric machines.
Advantages
CTC offer decisive advantages in the design of transformers, compared to the conventional paper-insulated rectangular wires:
- Greater electric efficiency from minimized load losses.
- Improved cooling from efficient heat dissipation.
- Reduced winding time for increased productivity in transformers.
- Improved mechanical strength of the windings due to composite construction.
SINGLE STRIP MIN – MAX
| Thickness | 1.10 – 3.15 mm |
| Width | 3.00 – 12.50 mm |
| Width/Thickness Ratio | 3:1 – 8:1 |
| Proof stress (0.2) | 60 – 260 N/mm |
| Enamel increase | 0.08 -0.18 mm |
CTC conductor MIN-MAX
| Number of wires | 5 – 47 No’s |
| Inter column layer | 0-0.5 mm |
| Height of CTC conductor | 5.50 – 70.00 mm |
| Width of CTC conductor | 6.00 – 26.00 mm |
| Transposing Pitch length | 35 – 225 mm |
CROSS OVER LENGTH MIN – MAX
| Until 6mm width | 25 mm |
| Over 6mm till 8 mm width | 30 mm |
| Over 8mm till 11mm width | 35 mm |
| Over 11mm width | 45 mm |
| Ratio height / width | 1:5 – 6:1 |