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Paper Covered Wire

Thermally Upgraded Paper Covered Wire

Thermally Upgraded Paper Covered Wire is a high-performance winding wire designed for transformer windings, offering electrical insulation for power transformers, reactors, and distribution transformers.

Copper / AluminumConductor

Round / RectangularProfile

TUP Insulation

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Product Overview

Conductor

Made from high-quality oxygen-free copper or electrical-grade aluminum, offering high electrical conductivity after annealing.

Winding Requirements

Available in various conductor sizes and paper wrapping methods, including butt wrapping, overlap wrapping, and interlocking wrapping, to meet different transformer winding requirements.

Insulation

Uses thermally upgraded insulation paper to provide electrical insulation and improved thermal endurance for transformer windings.

Technical Specifications

Paper covered wire – Conductor Dimensions

Parameter	Range
Rectangular Conductor Thickness (a)	0.80 – 12.00 mm
Rectangular Conductor Width (b)	3.00 – 25.00 mm
Width-to-Thickness Ratio (b/a)	≤ 20
Maximum Cross-Sectional Area	200 mm²
Round Conductor Diameter	2.00 – 5.00 mm

Enameled Paper Covered Wire – Conductor Dimensions

Parameter	Range
Rectangular Conductor Thickness (a)	1.00 – 3.00 mm
Rectangular Conductor Width (b)	5.00 – 18.00 mm
Round Conductor Diameter	2.00 – 5.00 mm

Paper Wrapping Methods

Wrapping 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. Customers may specify preferred brands, models, and specifications:

Electrical kraft paper
High-elongation fiber paper
High-density insulation paper
Aramid paper (NOMEX)
Thermally upgraded insulation paper
PET film

Key Advantages

Enhanced Thermal Performance

Thermally Upgraded Paper Covered Wire uses thermally upgraded insulation paper to provide improved thermal endurance for transformer windings operating under elevated temperature conditions.
High-Conductivity Conductors

Available with copper conductivity exceeding 100% IACS or aluminum conductivity exceeding 62% IACS after annealing, supporting efficient power transmission.
Long Continuous Length

Paper Covered Wire can be manufactured in continuous lengths of up to 8,000 meters without joints, reducing winding interruptions and minimizing potential connection points.
Large & Flexible Conductor Sizes

Available in rectangular conductors up to 12.00 mm thick, 25.00 mm wide, and 200 mm² cross-sectional area, supporting different transformer winding designs.

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 Thermally Upgraded Paper Covered Wire used for?

Thermally Upgraded Paper Covered Wire is mainly used in power transformers, distribution transformers, reactors, traction transformers, and rectifier transformers.

What conductor materials and sizes are available?

Copper and aluminum conductors are available, with rectangular sizes up to 12.00 mm in thickness, 25.00 mm in width, and 200 mm² in cross-sectional area.