Diamond Dotted Paper/DDP Insulation Paper for Transformer Layer Insulation
Date: 18-06-28
By: ZTELEC GROUP
Diamond Dotted Paper/DDP is made of electrical insulation paper with Diamond-shape epoxy resin dotted in both sides.
The epoxy resin used in DDP contains a kind of incubative hardener material, it is a dry ad crisp material at normal temperature(below 35 degree)
This product has good dielectric properties and good machenical properties after being heat-solidification. It can be used as coils and between layers of oil immersed power and distribution transformers.
thickness: 0.05 mm 0.08 mm 0.13 mm 0.15 mm 0.17 mm 0.25 mm
| Item | Index. | Unit | Value | |||||
| 1 | Thickness and tolerance | mm | 0.08±0.005 | 0.13±0.007 | 0.18±0.010 | 0.20±0.010 | 0.25±0.010 | |
| 2 | Density | g/cm3 | 0.85~1.10 | |||||
| 3 | Single thickness | μm | 10~15 | |||||
| 4 | Moisture content | % | 4.0~8.0 | |||||
| 5 | Oil-absorption | % | ≥20 | |||||
| 6 | Bond strength | at room temp. | kPa | ≥650 | ||||
| 100°C±2°C | ≥400 | |||||||
| 7 | Pollution for transformer oil | – | no pollution | |||||
| 8 | Tensile Strength | lengthwise | N/10mm | ≥60 | ≥110 | ≥160 | ≥180 | ≥230 |
| crosswise | ≥30 | ≥50 | ≥70 | ≥80 | ≥100 | |||
| 9 | Tearing Strength | lengthwise | Mn | ≥450 | ≥900 | ≥1350 | ≥1500 | ≥2000 |
| crosswise | ≥500 | ≥1000 | ≥1500 | ≥1700 | ≥2300 | |||
| 10 | Breakdown voltage | in air | KV | ≥0.88 | ≥1.37 | ≥2.00 | ≥2.10 | ≥2.25 |
| in oil | ≥4.40 | ≥7.00 | ≥9.00 | ≥9.80 | ≥11.50 | |||