Trafoboard® HD-PH
Pressboard
High-performance insulation products for oil filled power transformers
The experience of one century
For almost one century Röchling has been manufacturing the insulation material Lignostone® Transformerwood® for use in high-voltage transformers. This outstanding material enjoys an excellent reputation within the international transformer industry.
With Trafoboard® HD-PH Röchling now completes their range of insulation materials to a high-quality laminated pressboard for insulation components in oil-filled high-voltage transformers.
Trafoboard® HD-PH represents a high level of quality, excellent electrical and mechanical properties, high chemical purity and close tolerances.
Trafoboard® HD-PH has a density of 1.15 –1.35 g/cm³ and consists of highly densified pressboard layers made of pure cellulose according to IEC 60641, which are bonded permanently by means of phenolic glue according to IEC 60763 type LB 3.1A.2.
Characteristics
- Phenolic-resin glued pressboard according to IEC 60763-3-1 type LB 3.1A.2
- Made from hot pressed transformer pressboard, 100% unbleached sulphate cellulose, according to IEC 60641-3-1 type 3.1
- Electrically insulating
- Good mechanical properties
Application Examples
Variants
Technical Specifications Trafoboard® HD-PH
| Test Method | Unit | Guideline Value | |
|---|---|---|---|
| Density | DIN EN ISO 1183-1 | g / cm3 | 1.15 - 1.35 |
| Test Method | Unit | Guideline Value | |
|---|---|---|---|
| Flexural strength ┴ (MD) | IEC 60763-2 | MPa | 120 |
| Flexural strength ┴ (CMD) | IEC 60763-2 | MPa | 110 |
| Flexural modulus ┴ (MD) | IEC 60763-2 | MPa | 13000 |
| Flexural modulus ┴ (CMD) | IEC 60763-2 | MPa | 10500 |
| Compressibility (C) | IEC 60763-2 | % | 2.6 |
| Compressibility (Crev) | IEC 60763-2 | % | 93 |
| Test Method | Unit | Guideline Value | |
|---|---|---|---|
| Insulation class | IEC 60085 | / | A |
| Test Method | Unit | Guideline Value | |
|---|---|---|---|
| Shrinkage (MD) | IEC 60763-2 | % | 0.20 |
| Shrinkage (CMD) | IEC 60763-2 | % | 0.30 |
| Shrinkage (Thickness) | IEC 60763-2 | % | 1.50 |
| Moisture content | IEC 60763-2 | % | 5 |
| Oil absorption | IEC 60763-2 | % | 10 |
| pH of aqueous extract | IEC 60763-2 | pH | 7.1 |
| Test Method | Unit | Guideline Value | |
|---|---|---|---|
| Field strength at the onset of PD II | HS-OS ^1) | kV / mm | 10 |
| Conductivity of aqueous extract | IEC 60763-2 | mS/m | 7.1 |
| Electric strength in oil at 90° C II | IEC 60243-1 | kV / mm | > 9 |
