Paper-covered rectangular wire is a type of magnet wire made by wrapping insulating paper around a flat conductor (usually copper or aluminum). It combines the excellent fill factor of the flat wire conductor with the high heat resistance and excellent electrical properties of the paper insulation. It is widely used in electrical equipment operating at high voltages and temperatures.
Structural Components:
· Conductor: Typically made of high-purity copper or aluminum, rolled into flat wire of specified dimensions.
· Insulation: The conductor is wrapped with one or more layers of insulating paper. Common paper types include electrical paper, DMD (polyester film composite paper), and aramid paper (such as Nomex).
Paper wrapping can be spiral, overlapping, or longitudinal, depending on the product’s application and voltage level.
Product Features:
High insulation performance: The insulating paper has excellent dielectric strength, effectively preventing breakdown and short circuits.
Excellent thermal stability: Suitable for high-temperature environments, with some high-end products capable of withstanding temperatures exceeding 200°C.
Compact structure and high space efficiency: The flat wire shape allows for tighter winding, effectively improving space utilization.
Excellent mechanical strength: The paper wrapping can withstand the mechanical tension and thermal stresses of the winding process.
Efficient heat dissipation: Compared to round wire, flat wire has a larger contact area, which facilitates heat dissipation.
Applications：
Paper-wrapped rectangular wire is widely used in various electrical equipment, particularly in applications requiring high insulation performance and thermal stability. These applications primarily include:
Transformer windings: especially oil-immersed and dry-type transformers.
Medium and large motors: such as high-voltage motors, traction motors, and wind turbines.
Reactors and filters: demand high current stability and insulation.
Induction heating equipment: requires winding materials with high temperature and frequency resistance.
| Conductor | Paper covered rectangular wire |
| Dimension | rectangular：Thickness/a 0.9.10mmWidth（b）3.0-25mm |
| Insulationmaterials | Kraft paper/Thermally upgraded kraft paper/Nomex paper/Polyester film/ Polyimide film |
| Insulation thickness | Single,double or according to your requirement |
| Standard | IEC, NEMA, GB, JIS, UL |
| Packing | 30kg~150kg Ply-woodspool(250*500/250*600) |