Rigid Materials
Transformer Board
Transformer board is a specialized cellulose-based insulation material designed for use in oil-immersed transformers. It has low internal stress, good flatness, and high mechanical and electrical strength. It is used for strips, cylinders, spacers, plates and structural supports in oil-filled distribution transformers.
- Sheet size: 2000mm x 1000mm for 0.50mm – 1.50mm;
- 2000mm x 1000mm or 3000mm x 1000mm for 2.00mm – 3.00mm;
| Property | Unit | Unbleached sulphate pulp | |
|---|---|---|---|
| Thickness deviation | ≤0.5mm | % | ≤±10.0 |
| 0.5mm -1.6mm | ≤±7.0 | ||
| 1.6mm | ≤≤±7.0 | ||
| Apparent density | ≤0.5mm | g/cm3 | 1.10 -1.25 |
| 0.5mm -1.6mm | 1.00 - 1.25 | ||
| 1.6mm - 3.0mm | 1.00 - 1.25 | ||
| Tensile strength MD | 0.5mm - 3.0mm | N/mm2 | ≥90 |
| Tensile strength CMD | 0.5mm | N/mm2 | ≥35 |
| 0.5mm - 3.0mm | ≥50 | ||
| Shrinkage | MD | % | ≤1 |
| CMD | ≤1.4 | ||
| Thickness deviation | ≤6 | ||
| Elongation | MD | % | ≥3.5 |
| CMD | ≥4 | ||
| Ash content | % | ≤1 | |
| PH of aqueous extract | - | 6 - 9 | |
| Oil absorption | 1.0mm - 1.6mm | % | ≥9 |
| 1.6mm - 3.0mm | ≥9 | ||
| 3.0mm - 8.0mm | ≥9 | ||
| Conductivity of aqueous extract | ≤1.6mm | mS/m | ≤10 |
| 1.6mm - 3.0mm | ≤10 | ||
| Electrical strength in oil | 0.5mm - 1.0mm | kV/mm | ≥35 |
| 1.5mm - 2.0mm | ≥30 | ||
| 2.5mm | ≥27 | ||
| 3.0mm | ≥24 | ||
| Moisture content | 0.1mm - 0.5mm | % | 6 - 10 |
| 0.5mm - 1.5mm | 4 - 9 | ||
| 1.5mm - 3.0mm | 5 - 9 | ||