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China CTC Suppliers - High-Quality Continuously Transposed Conductor for Large Oil Immersed Power Transformer Factory

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Polyvinyl acetal enameled paper insulation continuously transposed cable (CTC) is a superior winding solution used in a variety of electrical applications. As a leading product among China suppliers, CTC comprises multiple strips of enameled rectangular wires organized in a unique design and encased in high-quality insulation material. This innovative cable is primarily utilized in large oil-immersed power transformers, reactors, and high-capacity dry-type transformers.

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The CTC conductor enhances the efficient use of winding space, minimizes overall volume, and reduces costs. Most importantly, it significantly lowers the circumference losses and eddy current losses that can occur due to magnetic field leakage. Moreover, it improves the mechanical strength of windings and decreases the time required for coil winding production.

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As manufactured by state-of-the-art factories, continuously transposed conductors (CTC) are essential materials for transformer windings, boasting excellent space utilization, low eddy current losses, high mechanical durability, and faster winding times. Choose our CTC solutions for an optimal mix of performance and reliability.

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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
    Please contact 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 CTC strips available?
    The production scope supports CTC strips ranging from 5 to 80 (odd or even), providing broad flexibility for transformer winding applications.
    What are the overall dimensional tolerances for CTC conductors?
    The maximum overall dimension is a height of 120mm and a width of 26mm, with a dimensional tolerance of ±0.05mm. Individual conductor thickness and width tolerances are maintained at ±0.01mm.
    What types of enameled CTC products are offered?
    We offer a comprehensive range including polyvinyl acetal enameled CTC with paper insulation, polyesterimide enameled CTC, composite CTC with step, composite CTC with screen wire inside, and polyvinyl alcohol enameled CTC with PET film insulation, among others.
    What is the recommended width-to-thickness ratio for single conductors?
    For the production scope, the suggested width/thickness ratio (b/a) of a single conductor is between 2.0 and 9.0. For standard product specifications, the recommended ratio is between 2.5 and 7.5.
    What insulation thickness is recommended for enamel and epoxy resin coatings?
    The suggested thickness for enamel insulation is 0.08–0.12mm, while the thickness of bondable epoxy resin is recommended at 0.03–0.05mm for optimal performance.
    Can custom CTC dimensions outside the standard range be manufactured?
    Yes. If your required dimensions fall outside the standard production range, please contact us directly. Our engineering team will assess feasibility and provide a tailored solution to meet your specific requirements.

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