Electrical Heat-resistant Diamond Dotted Insulating Paper(Thermal DDP)
- Details
The base paper of thermal DDP is the highly polymerized(DP value)cellulose paper produced from the nitrogenous Finland insulating wood pulp,and diamond coated with special modified epoxy resin on the surface,then cured by phase B.So the thermal DDP has good heat stability,mechanical and electrical properties.It is mainly used for natural ester new energy such as high ignition point vegetable oil and high overload oil-immersed transformers.
Product Solidification Conditions<Actual coil temperature>
First of all,to cure under ttemperature 90℃±5Cfor 3 hours,and then rise temperature to 125℃±5Cand keep6hours to cure.
Storage
The product should be stored in dry,clean and well-ventilated warehouse under 25℃.The fire,heat sources and direct sunshine should be avoided.The shelf life is recommended to be one year.The longer storage period must be approved bylab test before using.
| No. | Property | Unit | Requirements | ||||||
| 1 | Base material thickness and tolerance | mm | 0.085±0.005 | 0.13±0.007 | 0.18±0.015 | 0.25±0.020 | 0.38±0.020 | 0.05±0.000 | |
| 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 | Ash | % | ≤0.60 | ||||||
| 6 | Conduictivity of water extract | mS/m | ≤10 | ||||||
| 7 | pH PH value of water extract | 一 | 6.58.5 | ||||||
| 8 | oil absorption | % | ≥20 | ||||||
| 9 | Nitrogen content | % | ≥1.5 | ||||||
| 10 | Bonding strength | Normal | kPa | ≥650 | |||||
| 100℃±2℃ | ≥400 | ||||||||
| 11 | Pollution of transformer oil | 一 | No pollution(△tanδ<0 .001) | ||||||
| 12 | Tensile strength | M D | N/10mm Width | ≥90 | ≥120 | ≥180 | ≥240 | ≥260 | ≥400 |
| C D | ≥30 | ≥60 | ≥90 | ≥110 | ≥240 | ≥300 | |||
| 13 | Elongation | M D | % | ≥2.0 | |||||
| C D | ≥4.0 | ||||||||
| 14 | Breakdown Voltage | In air | kV | ≥0.90 | ≥1.40 | ≥2.20 | ≥2.60 | ≥3.70 | ≥5.00 |
| In oil | ≥5.50 | ≥8.00 | ≥10.00 | ≥13.00 | ≥20.00 | ≥22.50 | |||
