DDP Diamond Dotted Insulating Paper
If you are interested in our products or need technical supports and service,please contact us as bellowing:
- Details
Diamond dotted insulation paper(DDP)is made by coating special modified epoxy resin on the high-performance and low dielectric loss insulating paper.It is widely applied in inter-layer insulation and turn insulation of oil-immersed power transformers.It is able to prevent the displacement of coillayers after winding and curing,so as to ensure the steady mechanical and electrical performance of insulation structure.
| No. | Property | Unit | Requirements | ||||||
| 1 | Base material thickness and tolerance | mm | 0.08±0.005 | 0.13±0.007 | 0.18±0.010 | 0.25±0.010 | 0.38±0.020 | 0.50±0.030 | |
| 2 | Base material tightness | g/cm³ | 0.85～1.10 | ||||||
| 3 | Thickness of single side adhesive | Hm | 5~15 | ||||||
| 4 | Moisture | % | 4.0～8.0 | ||||||
| 5 | 0il absorbency | % | ≥20 | ||||||
| 6 | Bonding strength | Normal | kPa | ≥650 | |||||
| 100℃±2℃ | ≥400 | ||||||||
| 7 | Contamination of transformer oil | 一 | No pollution(△tanδ<0.001) | ||||||
| 8 | Tensile strength | MD | N/10mm Width | ≥60 | ≥110 | ≥160 | ≥230 | ≥260 | ≥400 |
| CD | ≥30 | ≥50 | ≥70 | ≥100 | ≥180 | ≥300 | |||
| 9 | Tear strength | MD | mN | ≥450 | ≥900 | ≥1350 | ≥2000 | ≥3600 | ≥5800 |
| CD | ≥500 | ≥1000 | ≥1500 | ≥2300 | ≥4100 | ≥6500 | |||
| 10 | Breakdown Voltage | In air | kV | ≥0.88 | ≥1.37 | ≥2.00 | ≥2.25 | ≥3.50 | ≥4.50 |
| In oil | ≥4.40 | ≥7.00 | ≥9.00 | ≥11.50 | ≥19.00 | ≥22.00 | |||
