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China Factory Suppliers of Large Oil Immersed Power Transformer Continuously Transposed Conductors (CTC)

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Polyvinyl acetal enameled paper insulation CTC, a product offered by leading China suppliers and manufacturers, is an advanced solution for transformer winding applications.

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Continuously Transposed Cable (CTC) is a sophisticated type of winding wire made by weaving a specific number of enameled rectangular wire strips in a dual-layer arrangement, wrapped in specialized insulation material. It is primarily utilized in large oil-immersed power transformers, reactors, and high-capacity dry-type transformers, making it an essential component from reliable Chinese factories.

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CTC conductors effectively maximize winding space usage, minimize volume, and reduce overall costs. Most importantly, they decrease circumferential and eddy losses caused by magnetic field leakage while enhancing the mechanical strength of windings and accelerating winding time.

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Transposed wire is predominantly employed in the winding processes of large oil-immersed power transformers, reactors, and substantial dry-type transformers, emphasizing the innovation found in offerings from China suppliers.

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As a crucial material for transformer winding, Continuously Transposed Conductors (CTC) boast benefits such as optimized space utilization, reduced eddy current loss, high mechanical strength, and shortened coil winding time—features that make them highly sought after from factories in China.

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    Production Scope

    CTC strips: 5–80 (odd or even)

    Max overall dimension: Height: 120mm  |  Width: 26mm  (tolerance ± 0.05mm)

    Dimension of enameled wire — Single conductor:

    Thickness a: 0.90–3.15mm  (tolerance ± 0.01mm)

    Width b: 2.50–13.00mm  (tolerance ± 0.01mm)

    Suggested width/thickness ratio of single conductor: 2.0 < b/a < 9.0

    Suggested thickness of enamel insulation: 0.08–0.12mm

    Thickness of bondable epoxy resin: 0.03–0.05mm

    Product Scope
    • Polyvinyl acetal enameled CTC with paper insulation
    • Polyvinyl-adhesive acetal enameled CTC with paper insulation
    • Polyvinyl-adhesive acetal semi-hard acetal enameled CTC with paper insulation
    • Polyvinyl acetal enameled CTC with special binded
    • Composite CTC with step
    • Composite CTC with screen wire inside
    • Polyesterimide enameled CTC
    • Polyvinyl alcohol enameled CTC with PET film insulation
    Product Description
    Number of strips 7–49
    Single dimension Thickness of conductor a: 1.00–3.15mm  |  Width of conductor b: 3.00–12.50mm
    Suggested ratio of width and thickness 2.5 < b/a < 7.5
    Note Please connect us if your dimension is out of above range. Insulation layers: 24 layers at one time.
    Max thickness of CTC 80mm (excluding insulation)
    Max width 26mm (excluding insulation)
    Max. Height of CTC bundles 80mm (excluding paper insulation)
    Max. Width of CTC bundles 26mm (excluding paper insulation)
    CTC Product Description
    Frequently Asked Questions
    What is the maximum number of strips available for CTC wire?
    Our CTC (Continuously Transposed Cable) supports 5 to 80 strips, available in both odd and even configurations, offering flexibility for a wide range of transformer applications.
    What are the dimensional tolerances for the CTC enameled wire?
    The single conductor thickness ranges from 0.90 to 3.15mm with a tolerance of ±0.01mm, and the width ranges from 2.50 to 13.00mm with the same tolerance of ±0.01mm. The overall height tolerance is ±0.05mm.
    What types of insulation are available for CTC products?
    We offer a variety of insulation types including paper insulation, PET film insulation, special binded insulation, and bondable epoxy resin coating, depending on the specific CTC product type selected.
    What is the recommended width-to-thickness ratio for the single conductor?
    The suggested width-to-thickness ratio (b/a) for the single conductor is between 2.0 and 9.0 for production scope, and between 2.5 and 7.5 for standard product specifications. If your dimension falls outside this range, please contact us for a custom solution.
    What is the maximum CTC bundle dimension that can be produced?
    The maximum height of CTC bundles is 80mm (excluding paper insulation), and the maximum width is 26mm (excluding paper insulation). For the overall dimension including insulation, the max height is 120mm and max width is 26mm.
    What types of CTC products are available for transformer manufacturing?
    We offer a comprehensive range of CTC products including Polyvinyl acetal enameled CTC, Polyvinyl-adhesive acetal enameled CTC, Polyesterimide enameled CTC, Composite CTC with step, Composite CTC with screen wire inside, and more, to meet diverse transformer design requirements.

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