Paper Insulated PVF CTC

Paper insulated PVF continuously transposed conductors (CTC) are the most mainstream winding material for large oil-immersed power transformers and shunt reactors. Each flat copper strip is coated with Class 120 polyvinyl acetal (PVF) enamel as inter-strand insulation, then multiple strands undergo precise continuous transposition, finally wrapped with multi-layer thermally upgraded electrical kraft paper for overall outer insulation.

This design ensures every copper strand evenly shares current in the bundle, drastically eliminating skin effect and proximity effect, cutting eddy current loss by 25%–35% vs solid flat copper wire. The PVF enamel matches perfectly with mineral transformer oil, no aging or swelling under long-term oil immersion.

JWHK adopts Italy PROTECO transposition system and Germany Queins constant tension wrapping machine, achieving ±0.1mm ultra-precise transposition pitch and uniform paper overlap rate. Single joint-free continuous length can reach over 4000 meters.

1. Ultra-Low Loss & High Energy Efficiency

Continuously Transposed Conductor balances current distribution across all strands, suppresses eddy loss and local overheating, directly lowering transformer no-load & load power consumption, fully meeting national & international high-efficiency transformer standards.

2. Excellent Oil Immersion Compatibility

PVF polyvinyl acetal enamel has stable chemical inertia in mineral transformer oil, no hydrolysis, no insulation degradation after 20+ years submerged operation. Multi-layer interleaved paper wrapping forms orderly oil cooling channels to accelerate heat dissipation.

3. Outstanding Short-Circuit Mechanical Resistance

High-yield oxygen-free copper + tight transposition bundling makes the whole winding act as an integrated rigid beam, capable of resisting huge electrodynamic shock during sudden short-circuit faults, avoiding strand displacement or insulation breakage.

4. Stable & Traceable Intelligent Production

MDC/DNC full digital production system records every transposition pitch, wrapping tension, enamel baking temperature data for full batch traceability; AI online dimension inspection rejects out-of-tolerance products 100%.

1. Oxygen-Free Copper Rod Drawing → Precision flat strip sizing
2. PVF Enamel Coating & High-Temp Curing (Class 120 standard)
3. Italy PROTECO Automated Continuous Transposition (±0.1mm pitch accuracy)
4. Germany Queins Constant-Tension Multi-Layer Paper Wrapping
5. Online Digital Length Counting & Dimension Inspection
6. Electrical Test: Breakdown Voltage, Insulation Resistance, Conductivity
7. Moisture-Proof Export Spool Winding & Packing

• 110kV / 220kV / 500kV / 1000kV Large Oil-Immersed Power Transformers
• High-Capacity Distribution Oil Transformers
• Oil-Immersed Shunt Reactors & Series Filter Reactors
• Nuclear Power Station Auxiliary Transformers

• Inner Spools: Heavy-duty solid wooden spools / Iron spools (prevent conductor bending deformation)
• Outer Package: IPPC fumigated wooden pallets, export wooden crates, Euro standard pallets
• Protection: Full moisture-proof PE film + shock-absorbing foam corner guards
• MOQ: 1 Ton; Lead Time: 2–4 weeks standard, 1–2 weeks urgent priority production
• Shipping Modes: Sea freight, air freight, full-container truck land transport, door-to-door global delivery

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