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Paper Covered Combined Conductors

Paper Insulated Combined Conductor

Paper Insulated Combined Conductor is a composite winding wire consisting of multiple individually paper-insulated strands assembled in parallel, designed for large-capacity transformers and high-voltage reactors to minimize eddy current losses and enhance thermal dissipation.

Copper / AluminumConductor

RectangularProfile

Kraft / TUP / NOMEX PaperInsulation

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Product Overview

Conductor

Available in high-quality oxygen-free copper or electrical-grade aluminum. Copper has an oxygen content below 20 ppm and conductivity exceeding 100% IACS after annealing, while aluminum conductivity exceeds 62% IACS after annealing. Semi-hard copper is available in C1, C2, and C3 grades.

Winding Requirements

Rectangular conductor thickness ranges from 1.00–6.00 mm, with widths of 4.00–20.00 mm. The width-to-thickness ratio is ≤ 20, and the maximum cross-sectional area is 150 mm². Paper wrapping methods include butt wrapping with a gap of ≤ 0.5 mm, overlap wrapping with an overlap width of 2–4 mm, and interlocking wrapping with 50% mutual interlocking.

Insulation

Multiple individually paper-insulated strands are assembled in parallel to form a combined conductor. Available insulation materials include Kraft paper, high-elongation fiber paper, high-density insulation paper, aramid paper (Nomex), thermally upgraded insulation paper, and PET film.

Technical Specifications

Paper Insulated Combined Conductor – Conductor Dimensions

Rectangular Conductor Thickness (a)	1.00 – 6.00 mm
Rectangular Conductor Width (b)	4.00 – 20.00 mm
Width-to-Thickness Ratio (b/a)	≤ 20
Maximum Cross-Sectional Area	150 mm²

Wrapping Methods

Method	Specification
Butt Wrapping	Gap ≤ 0.5 mm
Overlap Wrapping	Overlap width 2 – 4 mm
Interlocking Wrapping	50% mutual interlocking

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

Insulation Materials

We use premium insulation materials from domestic and international suppliers, including:

Kraft paper
High-elongation fiber paper
High-density insulation paper
Aramid paper (Nomex)
Thermal upgraded insulation paper
PET film

Customers may specify preferred insulation material brands, models, and specifications.

Key Advantages

Continuous Length

Up to 8,000 meters without joints, reducing winding interruptions and improving production efficiency.
Dual Conductor Options

Copper or aluminum conductors available, each with optimized conductivity and mechanical properties.
Customizable

All specifications, insulation materials, and wrapping methods can be tailored to customer requirements.

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 a Paper Insulated Combined Conductor?

A Combined Conductor is a winding wire consisting of multiple conductors arranged in parallel, insulated with paper, enamel, film, or a combination of these materials.

What are the main application fields of this Paper Insulated Combined Conductor?

This Combined Conductor is primarily used in the winding of large power transformers (especially 220kV and above), high-voltage reactors, specialty transformers, and large motor windings. It serves as a core winding material for EHV (Extra High Voltage) and large-capacity power transmission and transformation equipment.

What is the maximum continuous length you can produce for Combined Conductor?

Our standard production supports continuous lengths exceeding 8,000 meters without joints, which significantly reduces winding interruptions during transformer manufacturing.