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Paper-insulated Enameled Transposed Conductor1.jpg
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Continuously Transposed Conductor CTC- Paper-insulated

Take enameled flat wire as the base material, stranded by continuous transposition and wrapped with fiber paper/aromatic polyamide paper on the outer layer as the main insulation.Paper-insulated acetal enameled transposed conductor (Most commonly used basic type). It is the most versatile basic type in the industry, with mature technology, moderate cost, good compatibility between the insulation layer and oil-immersed medium, and balanced electrical and insulation performance without additional functions.

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    MATERIAL & STRUCTURE

     • Conductor: Oxygen-free high-conductivity copper (Cu ≥ 99.99%)

     • Strand insulation: Polyvinyl acetal enamel (self-supporting, high adhesion, oil-resistant)

     • Transposition: Continuous regular transposition, factory pre-formed

     • Outer insulation: High-density electrical insulating paper / crepe paper

    Paper-insulated Enameled Transposed Conductor

    DIMENSIONAL DATA

    1. Single Enameled Flat Copper Strand
    • Thickness (a): 0.80 – 3.15 mm
    • Width (b): 3.00 – 13.00 mm
    • Aspect ratio: 2b/a ≤ 5
    • Tolerance (a/b ≤ 3.15 mm): ±0.03 mm

    2. Number of Strands
    • Range: 4 – 80 strands (single or double row)

    3. Enamel Insulation (Inter-turn Insulation)
    • Grade 1: thickness 0.06 – 0.11 mm
    • Grade 2: thickness 0.12 – 0.17 mm

    Selection Decision Table for Transposed Conductors

    Selection Dimension Paper-Insulated Acetal Enameled Transposed Conductor (Basic Soft Type) Paper-Insulated Heat-Bonded Acetal Enameled Transposed Conductor (Soft Type) Paper-Insulated Semi-Hard Heat-Bonded Acetal Enameled Transposed Conductor (Semi-Hard Type) Mesh-Wrapped Transposed Conductor
    Applicable Environment Suitable for both oil-immersed and dry-type transformers Suitable for both oil-immersed and dry-type transformers, better adaptability to oil-immersed type Suitable for both oil-immersed and dry-type transformers, optimal adaptability to oil-immersed high-voltage working conditions Oil-immersed type only, dust accumulation in dry-type application impairs insulation performance
    Heat Dissipation Requirement Medium to low heat dissipation requirement Medium to high heat dissipation requirement High heat dissipation requirement (large-capacity windings) Ultra-high heat dissipation requirement (oil directly reaches conductors)
    Working Condition Vibration Stable, no severe vibration Slight vibration, conventional working conditions Medium and high frequency vibration, high-voltage heavy-duty working conditions Severe vibration, frequent start-stop (traction/special working conditions)
    Transformer Specification Small and medium distribution/power transformers, conventional mutual inductors Medium and large power transformers, rectifier transformers Large/extra-large oil-immersed transformers, UHV/mining transformers Large oil-immersed transformers, wind/photovoltaic step-up transformers, railway traction transformers, metallurgical and marine special transformers
    Winding Compactness/Shape Retention General, auxiliary fixation required after winding Good, no strand loosening due to core wire bonding Optimal, no deformation after shaping with semi-hard & heat-bonded structure Good, high flexibility with close fit, no loosening problem
    Mechanical Resistance Withstands ordinary impact, general vibration resistance Good impact and vibration resistance Withstands strong impact and short-circuit impact, optimal mechanical strength Excellent vibration and deformation resistance, high toughness of mesh structure
    Insulation Stability Sealed insulation with stable performance, general type Sealed insulation, bonding layer improves structural stability Sealed insulation, adapted to high-temperature and high-voltage insulation requirements Insulation performance depends on mesh tape density (customizable), good compatibility with transformer oil
    Winding Forming Efficiency Conventional, suitable for manual/mechanical winding High, no strand loosening and no additional lashing required Ultra-high, good shape retention with one-time forming Ultra-high, high flexibility with fast winding speed
    Cost & Process Standard process, highest cost performance Standard + bonding process, medium cost Custom process, relatively high cost, top-grade type Custom mesh tape process, relatively high cost, dedicated for special working conditions
    Core Adaptation Point Conventional general use, low-cost demand Medium and large capacity, winding compactness requirement High-voltage heavy-duty, extra-large capacity, high shaping precision demand Ultra-high heat dissipation, severe vibration, special oil-immersed working condition demand

    Conventional windings of regular oil-immersed power transformers, medium and low voltage distribution transformers, and general-capacity industrial transformers, suitable for general working conditions such as power grid distribution and general industrial production.

    Paper-Insulated Enameled Transposed Conductors - Classification by Type

    I. By Enamel Coating Material (Mainstream for Transformer/Electrical Conductors)


     1. Paper-insulated acetal enameled transposed conductor (Most commonly used basic type)

     2. Paper-insulated polyurethane enameled transposed conductor

     3. Paper-insulated polyester enameled transposed conductor

     4. Paper-insulated modified polyester enameled transposed conductor

    II. Core Acetal Enameled Series (Classified by Process/Hardness, Customized for Your Product System)


     1. Paper-insulated acetal enameled transposed conductor (Basic soft type, non heat-bonded)

     2. Paper-insulated heat-bonded acetal enameled transposed conductor (Soft type, core wire heat-bonded and shaped)

     3. Paper-insulated semi-hard acetal enameled transposed conductor (Semi-hard type, non heat-bonded)

     4. Paper-insulated semi-hard heat-bonded acetal enameled transposed conductor (Semi-hard type, core wire heat-bonded and shaped, top-grade type)

    QUALITY & COMPLIANCE

    • RoHS & REACH compliant

    • Factory test report available (size, resistance, breakdown voltage, elongation, transposition)

    • Certificate of Conformity (COC) per batch

    • Third-party inspection supported (SGS, BV, etc.)

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    OUR FACTORY

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