Diamond Dotted Paper (DDP)
DIAMOND DOTTED PAPER (DDP)
Description
Diamond dotted insulation paper is made of electrical insulating paper coated with heat curable epoxy resin, the epoxy adhesive is applied to both sides of the paper in a diamond pattern consisting of
Features
· Insulation class A (
· Kraft paper, 100% sulphate pulp
· High purity and mechanical strength
· Color natural
· Baked enamel coating: Epoxy resin , rhombic, one or both sides
· Good compatibility with liquid dielectic after the baked enamel coating has hardened.
· Care should be taken that the that the layers to be baked remain closely pressed against each other during baking time
Applications
It is to be used in oil-immersed transformers for the insulation between of coils .On the insulation layer, there is a layer dotted epoxy resin that will be changed with high temperature change that is to be called as felt
Available
Thickness:
Both in roll and sheet are available
Width:
Technical Data
Specified Properties |
Units |
Standard |
Thickness Tolerance |
Mm |
0.075, 0.08, 0.13, 0.18, 0.20,0.25, 0.30, 0.35 |
Density |
g/mm^3 |
0.95 – 1.15 |
Tensile strength Min |
N/mm^2 |
MD 70 – 90 |
CMD 40 - 50 |
||
Elongation Min |
% |
MD 2.0 – 3.0 |
CMD 7.0 – 9.0 |
||
Breakdown volume Min |
KV/mm |
In air 11-12 |
In oil 45-50 |
||
Oil Absorption Min |
% |
8 |
Moisture Content |
% |
4.0-8.0 |
Resin’s Content Min |
% |
7 , 6 , 5 , 4 , 3.5 |
Ash Content Max |
% |
1 |
Adhesion Strength Min |
kPa |
450 |
dp |
|
1000 |
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