Kraft paper 、Nomex paper、HPl-Green paper wrapped copper (aluminum) rectangular wire
Kraft paper(the thermal class 105℃)、Nomex paper、 HPl-Green paper(the thermal class 120 ℃) wrapped copper (aluminum) rectangular wire is extruded or drawn from an oli-free copper rod or electrical round aluminum rod with the requested specification mold. Then the copper or aluminum conductor is wrapped with one or more layers of insulated paper. The product is widely used in oil-immersed choke coils and other similar electrical transformers 、electric reactor motor instruments.
Paper Covered Copper (Aluminum) Flat Wire and other related products used in oil-immersed transformers, 120 degrees heat-resistant, we can according to customer requirements produce different insulation thicknesses of the product in order to meet the customer’s needs. Also, we can pack for high-temperature insulation paper (such as mark paper).
1.Standard:Paper Covered Copper (Aluminum) Flat Wire conform to GB7673-2008(IEC60371）and Enterprise Standards
2. Production Range:
Paper-wrapped copper rectangular wire
Narrow side size a:1.18mm-5.6mm
Wide side size b:2.8mm-18mm
paper-wrapped aluminum rectangular wires
Narrow side size a:1.25mm-8mm
Wide side size b:3mm-18mm
In temperature of 20 ℃, the resistivity of copper rectangular wire is no more than 0.017241Ω m²/m, and the resistivity of aluminum rectangular wire is no more than 0.02801Ω m²/m.
4. The size of the conductor should conform to the table as follows：
| Narrow nominal side size a or wide nominalside size b(mm) | Deviation(mm) |
|---|---|
| a(b)＜3.15 | ±0.030 |
| 3.15＜a(b)≤6.30 | ±0.050 |
| 6.30＜a(b)≤12.50 | ±0.070 |
| 12.50＜a(b)＜16.00 | ±0.100 |
5.Insulation thickness
| Nominal Insulation thickness | 0.30 | 0.40 | 0.45 | 0.60 | 0.95 | 1.05 | 1.35 | 1.60 | 1.95 | 2.45 | 2.65 | 2.95 | 3.95 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Max Insulation thickness | 0.33 | 0.44 | 0.50 | 0.65 | 1.02 | 1.13 | 1.45 | 1.70 | 2.05 | 2.57 | 2.78 | 3.10 | 4.15 |
| Min Insulation thickness | 0.27 | 0.36 | 0.40 | 0.56 | 0.88 | 0.98 | 1.29 | 1.52 | 1.86 | 2.33 | 2.52 | 2.81 | 3.85 |
6.Conductor fillet radius r
| Nominal size(mm) | Fillet radius r | |
|---|---|---|
| Nominal size/mm | Deviation | |
| a≤1.00 | a/2 | — |
1.00| 0.5 | ±25% |
|
1.60| 0.65 |
| |
2.24| 0.8 |
| |
| a>3.55 | 1 | |
7.Maximum external size
A maximum external size of no more than the maximum size of the conductor adds double the maximum insulation thickness.
Note: The structure of paper-wrapped copper (aluminum) rectangular wire should conform to the supply and demand requirements. For example, the layers of insulation paper, method of wrapping, insulation thickness, and so on. The surface of the conductor should be without copper powder and other impurities, every layer of the insulation paper should be continuous, firm, and without wrinkles, without a joint point and binding material except the tail end of the insulation paper.
8.Elongation
| Narrow nominal side size a(mm) | Minimum elongation(%) | |
|---|---|---|
| ＞ | ≤ | |
| — | 2.5 | 30 |
| 2.5 | 5.6 | 32 |
Note: Proof strength at non-proportional extension and elongation of semi-hard copper should conform to the following table.
| Type | Proof strength at non-proportional extension (N/mm2 ) | Min Elongation (%) | the resistivity of copper in 20℃ (Ωm²/m) |
|---|---|---|---|
| C1 | 100| 20 | 1/58.0 |
|
| C2 | 100| 20 | 1/57.5 |
|
100| 15 | 1/57.5 |
| |
| C3 | 100| 15 | 1/57.0 |
|
9.Rebound resilience
The rebound angle of conductor should less than or equal to 5°
Note: Except semihard copper.