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Home / Products / Continuously Transposed Conductor (CTC) / Paper Insulated CTC

Continuously Transposed Conductor (CTC)

Paper Insulated CTC

Paper Insulated CTC is a specialized winding wire consisting of a number of individually enameled rectangular conductors arranged in two parallel rows and continuously transposed along the length direction.

Copper / AluminumConductor

RectangularProfile

CustomizedInsulation

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Product Overview

Conductor

Made from high-quality oxygen-free copper or electrical-grade aluminum. Copper conductivity exceeds 100% IACS after annealing, while aluminum conductivity exceeds 62% IACS.

Winding Requirements

Available with 5–64 transposed conductors. Maximum external dimensions are 120 mm in height and 26 mm in width. Single conductor thickness ranges from 0.90–3.15 mm, and width from 2.50–13.00 mm.

Insulation

Each conductor is enamelled and wrapped with insulation materials such as kraft paper, high-elongation fiber paper, high-density insulation paper, thermally upgraded paper,Nomex. Butt, overlap, and interlocking wrapping methods are available.

Technical Specifications

Conductor Configuration

Number of transposed conductors	5–64 strands (optional)
Maximum external dimensions	Height 120mm, Width 26mm, Width tolerance ±0.05mm

Enamelled Wire Dimensions

Single conductor thickness (a)	0.90–3.15mm, tolerance ±0.01mm
Single conductor width (b)	2.50–13.00mm, tolerance ±0.02mm
Recommended width-to-thickness ratio	2.0 < b/a < 9.0
Recommended enamel coating thickness	0.08–0.12mm
Self-adhesive coating thickness	0.03–0.05mm
Transposition Pitch	S = D · π / N S = Transposition pitch D = Minimum diameter of the coil N = Number of single enamelled conductors

Typically, the transposition pitch is 8–12 times the width of a single conductor, and can reach 6 times under specific conditions, with a minimum transposition pitch of 18mm. A precisely controlled transposition pitch ensures uniform current distribution and minimal circulating current losses in the finished transformer winding.

Values shown are typical ranges — exact parameters are confirme.

Material Description

Conductor Materials

① Copper Conductor:
• Made from high-quality oxygen-free copper rods
• Oxygen content < 20 ppm
• Conductivity after annealing > 100% IACS

② Aluminum Conductor:
• Made from high-quality electrical grade aluminum rods
• Conductivity after annealing > 62% IACS

Recommended Proof Strength (Rp0.2) for Semi-Hard Copper:

Grade	Rp0.2 Range	Resistivity Requirement
C1	100 – 180 N/mm²	1/58 Ω·mm²/m (when Rp0.2 < 200 N/mm²)
C2	180 – 220 N/mm²	1/57.5 Ω·mm²/m (when Rp0.2 > 200 N/mm²)
C3	220 – 260 N/mm²

· High-quality aluminum electrical rods, with a conductivity exceeding 62% after annealing

Insulation Materials

High-quality insulation materials from both domestic and foreign suppliers

Kraft paper
High elongation fiber paper
High-density insulation paper
Thermally upgraded paper
Netting Tape
PET film
Nomex
Users can specify the brand, model, and specifications of the insulation materials.

Key Advantages

Wide Strand Configuration

Available with 5–64 transposed conductors, supporting different transformer winding designs and current requirements.
Controlled Transposition Pitch

The standard transposition pitch is typically 8–12 times the single conductor width, with a minimum pitch of 18 mm, helping maintain balanced current distribution.
Copper & Aluminum Conductors

Available in oxygen-free copper with oxygen content below 20 ppm or electrical-grade aluminum with conductivity above 62% after annealing.
Large Conductor Size Capability

The finished CTC can reach a maximum height of 120 mm and width of 26 mm, suitable for large transformer and reactor winding applications.

Typical Applications

Customization & Technical Support

Share your drawings and operating equiprements so ourteam can review the right specification.

Discuss Your Requirements

Conductor dimensions

Insulation requirements

Winding and processing needs

Packaging and delivery requirements

Why Choose Yuheng

Engineering Support

Work with us to select suitable materials and specifications for your application.

Quality & Traceability

Consistent manufacturing processes with material traceability.

Manufacturing

Flexible production to support different specifications and customer requirements.

Delivery Coordination

Work with our team on production scheduling and delivery arrangements.

Frequently Asked Questions

What is Paper Insulated CTC used for?

It is mainly used for windings in large power transformers, reactors, traction transformers, specialty transformers, and high-voltage electric motors.

How many conductors can be used in Continuously Transposed Conductor?

The number of transposed conductors can be customized from 5 to 64 strands according to the winding design.

What insulation materials are available?

Options include power cable paper, fiber paper, high-density insulation paper, Nomex, thermally upgraded paper, and PET film.

Can Continuously Transposed Conductor be customized?

Yes. We support customization of conductor material, dimensions, strand quantity, insulation material, wrapping method, transposition pitch, and packaging.