Product Parameters
Conductor Material: 99.95% pure copper (ETP grade) or 99.7% aluminum (1060/1350 series)
Dimensions:
Width: 2.0mm – 25.0mm
Thickness: 0.5mm – 8.0mm
Paper Wrapping Layers: 2 – 8 layers (each layer 0.05mm – 0.12mm thick)
Insulation Class: Class 105 (A), Class 130 (B) (kraft cable paper with impregnated options for higher temps)
Tensile Strength: Copper core ≥ 205 MPa; Aluminum core ≥ 90 MPa
Elongation: ≥ 15% (copper); ≥ 12% (aluminum)
Breakdown Voltage: ≥ 5kV (2 layers); ≥ 15kV (8 layers) (varies with layer count and impregnation)
Standards Compliance: IEC 60554. NEMA MW 1000. GB/T 13035
Product Advantages
Superior Dielectric Performance: Cable paper insulation provides excellent voltage resistance, ideal for high-voltage transformers and reactors where insulation reliability is critical.
Space Efficiency: Flat shape allows 25-30% higher packing density than round wire, reducing the size of electrical equipment.
Cost-Effective Insulation: Paper wrapping is more affordable than enamel or plastic insulation for large-diameter conductors, lowering material costs by 15-20%.
Impregnation Compatibility: Works well with insulating oils and resins, enhancing moisture resistance and dielectric strength when fully impregnated.
Material Flexibility: Choose copper for maximum conductivity (98% IACS) or aluminum for weight savings (30% lighter) in non-critical applications.
Product Features
Uniform Wrapping: Tightly wrapped cable paper with consistent overlap (15-20%) ensures no gaps in insulation, preventing voltage breakdown.
Smooth Edges: Flat conductor has rounded edges (radius ≥ 0.2mm) to prevent paper tearing during wrapping and handling.
Oil Absorption: Unimpregnated paper readily absorbs insulating oil, forming a solid dielectric barrier when used in oil-immersed equipment.
Mechanical Protection: Paper layers cushion the conductor against minor impacts and abrasion during installation.
Environmentally Friendly: Cable paper is biodegradable and recyclable, making it a more sustainable choice than synthetic insulations.
Product Process
Conductor Forming: Copper/aluminum rods are rolled into flat strips, then annealed to achieve the desired ductility.
Surface Cleaning: The flat conductor is degreased and dried to ensure proper adhesion with wrapping paper.
Cable Paper Wrapping: Automated machines wrap cable paper around the flat conductor with precise tension and overlap, ensuring uniform coverage.
Drying: Wrapped wire is dried at 80-100°C to remove moisture from the paper, preventing insulation degradation.
Impregnation (Optional): For enhanced performance, wire is impregnated with insulating oil or resin, then cured to seal the paper.
Quality Testing: Includes breakdown voltage testing, wrapping tightness checks, and conductor dimension verification.
Main Application Fields
Power Transformers: Core and winding conductors in distribution and power transformers, especially oil-immersed types.
Reactors: Current-limiting reactors and shunt reactors where high dielectric strength is required.
Electrical Motors: Large industrial motors with high voltage ratings, using paper-wrapped wire for reliable insulation.
Generators: Stator and rotor windings in small to medium-sized generators.
Distribution Equipment: Bus bars and conductors in switchgear and distribution panels where space is limited.
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