CTC

Continuously Transposed Conductor (CTC) is utilized in powertransformers and chokes for reduced losses and low winding cost. For applications in oil-filled transformers the conductors are insulated with polyvinyl acetal based enamel.

The stranded conductors are covered with various types of insulating paper or tape. For dry transformers there are enamelled conductors (temp. index 180) available and an overall covering of Nomex® 410 or glass-tape. The mechanical regidity of a CTC under short circuit conditions can be improved by either using conductors with an increased copper hardness or with a thermobondable overcoat or combination of both.

 

min.

max.

Number of strands

5

43

Thickness

mm

1.05

3.15

Width

mm

3.00

12.50

Ratio width/thickness

2

7.5

Cross section strand

mm

4

31

Axial Width

mm

26

Radial Height

mm

50