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Paper Covered Combined Conductors

Paper Insulated Enameled Combined Conductor

Enameled Paper Insulated Combined Conductor is composed of multiple individually enamel-insulated conductors combined and wrapped with insulated paper, with each conductor featuring dual insulation of both enamel film and paper layer.

Copper / AluminumConductor

RectangularProfile

Kraft / TUP / NOMEX PaperInsulation

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Product Overview

Conductor

Available in oxygen-free copper or electrical-grade aluminum. Copper conductivity exceeds 100% IACS, while aluminum conductivity exceeds 62% IACS after annealing.

Winding Requirements

Rectangular conductor thickness: 1.00–3.00 mm; width: 5.00–18.00 mm.

Insulation

Each conductor has dual insulation consisting of enamel and paper wrapping. Available paper materials include electrical kraft paper, high-elongation fiber paper, high-density insulation paper, aramid paper (Nomex), thermally upgraded insulation paper, and PET film.

Technical Specifications

Enameled Paper Insulated Combined Conductor – Conductor Dimensions

Rectangular Conductor Thickness (a)	1.00 – 3.00 mm
Rectangular Conductor Width (b)	5.00 – 18.00 mm
Round conductor diameter	2.00~5.00mm

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:

Electrical 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.
Dual-layer insulation (enamel + paper)

It eliminates partial discharge via the enamel film, ensures safety through layer redundancy, providing reliable protection for demanding applications such as UHV and nuclear power equipment.

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's the difference from ordinary paper-covered wire?

Ordinary paper-covered wire has only a single paper insulation layer, while Enameled Paper Insulated Combined Conductor adds an enamel film underneath, providing thicker and more reliable insulation with effective prevention of partial discharge.

Where is this Combined Conductor used?

Enameled Paper Insulated Combined Conductor is mainly used in 500kV and above UHV transformers, converter transformers, nuclear power equipment, and other high-end power apparatus with extremely high safety requirements.

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.