Kraft Paper Covered Rectangular Copper Conductor
ISO-CU-KRF-F105
CROSS-SECTION & LAYERS
Paper Insulated Wires
The core and insulation layers are shown to scale as a representation; refer to the datasheet for exact thickness and tolerance values.
APPLICATIONS
Where Is This Product Used?
The gold area in the scenes shows where the conductor sits in the machine.
ALSO Oil-type power transformers
Distribution transformers
Shunt reactors
Current and voltage transformers
Tap-changer connections
Product Description
Kraft paper insulated flat copper conductor is the basic element of oil-type power transformer windings. Cellulosic paper is wound onto the conductor at a defined number of layers and overlap; when the transformer tank is evacuated and filled with oil, the oil penetrates the paper's pores and a paper-oil insulation system that works together is formed.
The dielectric strength of this system is far above the value paper provides alone; because the oil fills the air voids between the paper fibres, it pushes the onset of partial discharge to high voltage levels. The determinant of insulation quality is therefore the thoroughness of the drying and oil-filling process.
The papers used comply with the electrical-purpose cellulosic paper requirements under IEC 60554; the conductor is produced from EN 13601 referenced electrolytic copper. The product is shipped in moisture-proof packaging and must be stored in a controlled environment before winding.
Applications
Oil-type power transformers, distribution transformers, shunt reactors, current and voltage transformers, tap-changer connections.
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ISO-CU-DNS-F105Technical Documentation
| Conductor Material | Electrolytic Copper (Cu-ETP, 99.9%) |
| Standard | IEC 60554 |
| Conductor Size | 2 – 16 mm |
| Thickness / Grade | 0.80 – 5.60 mm |
| Surface | Annealed |
| Product Code | ISO-CU-KRF-F105 |
| Thermal Class | Class 105 (A) |
| Build Increase | 0.80 – 5.60 mm |
| Conductor Section | 1.50 – 90.00 mm² |
| Insulation Type | Multi-layer kraft paper |
| Winding Type | Helical paper winding, 50% overlap |
| Test Certificate | EN 10204 3.1 + paper declaration of conformity |
| Packaging | Reel sealed with moisture-proof film |
Kraft Paper Insulation Structure
| Winding Layer | Tape Width (mm) | Overlap Ratio (%) | Total Build Increase (mm) | Thermal Class |
|---|---|---|---|---|
| 2 layers kraft paper | 15 | 50 | 0.25 | Class 105 (A) |
| 4 layers kraft paper | 20 | 50 | 0.50 | Class 105 (A) |
| 6 layers kraft paper | 20 | 50 | 0.75 | Class 105 (A) |
| 8 layers kraft paper | 25 | 50 | 1.00 | Class 105 (A) |
| 12 layers kraft paper | 25 | 50 | 1.50 | Class 105 (A) |
Conductor Dimension and Weight Table (uninsulated section)
| Width b (mm) | Thickness a (mm) | Corner Radius r (mm) | Section (mm²) | Approx. Weight (kg/km) |
|---|---|---|---|---|
| 3.15 | 1.25 | 0.40 | 3.80 | 33.8 |
| 4.00 | 1.60 | 0.50 | 6.19 | 55.0 |
| 5.00 | 2.00 | 0.65 | 9.64 | 85.7 |
| 6.30 | 2.24 | 0.65 | 13.75 | 122.2 |
| 8.00 | 2.50 | 0.80 | 19.45 | 172.9 |
| 10.00 | 3.15 | 0.80 | 30.95 | 275.1 |
| 12.50 | 4.00 | 1.00 | 49.14 | 436.9 |
| 16.00 | 5.00 | 1.25 | 78.66 | 699.3 |
Our Kraft Paper Covered Rectangular Copper Conductor product is supplied in accordance with internationally accepted manufacturing and inspection standards. Dimensional tolerances, material chemical analysis and mechanical values meet the requirements of the relevant standard.
- Manufacturing standard: IEC 60554
- Conductor material: Electrolytic Copper (Cu-ETP, 99.9%)
- Thermal class: Class 105 (A)
- Wall thickness: 0.80 – 5.60 mm
- Diameter range: 2 – 16 mm
- Visual inspection and dimensional control are carried out before shipment.
If your project requires a different standard, you can consult our technical team for alternative products.
On request, the products we supply are shipped together with an EN 10204 3.1 material certificate. Our quality management system and product documents are updated regularly; batch-based traceability is provided.
Communicating your certificate request at the quotation stage speeds up the shipment process.
ISO 9001:2015 Quality Management System
ISO 14001 Environmental Management System
ISO 45001 Occupational Health and Safety Management System
EN 10204 3.1 Material Certificate
IEC 60317 Declaration of Conformity
IATF 16949 Automotive Quality Management System
REACH Declaration of Conformity
RoHS Declaration of Conformity
Note: The values in the datasheet are nominal. For requests outside the standards and dimensions above, reach us through the quote form; non-catalogue dimensions are planned according to the production schedule.