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Diamond Dotted Paper
Made of Kraft paper coated with
heat curable epoxy resin, the epoxy adhesive is
applied to both sides of the paper in a diamond pattern
consisting of 9.5mm x9.5mm
diamonds with 15.9mm center spacing.
The Diamond Dotted Paper, alias such as: epoxy adhesive diamond
Paper, Diamond
Dotted Presspaper, Double sided Diamond Pattern Paper, DDPP,
DPRCP, D.D.P, DPP,
Diamond Dotted Insulating Paper, Varnished Paper, etc.
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.
It is a kind of material with inertia, dry and no conglutination
at normal temperature
(below 30 degree C), The Diamond Dotted Paper will make the
electric conductor
forever felt up as a hard unit under the high temperature by its
internal latency
substance. When the temperature is rising up to 90 degree C, The
Diamond
Dotted Paper begins one-off thaw and then one-off
solidification. When to keep the
temperature at 90 degree C for 90 minutes, the epoxy resin would
paste on
neighboring cable and paper safely. The felt intensity is as
high as to 70psl at 100
degree C (The value at least is equal to 0.275Mpa, America
standard).
Packing:
In pallet
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|
Callper (Inch) |
0.003 |
0.005 |
0.007 |
0.01 |
0.015 |
0.02 |
|
(millimotor) |
0.076 |
0.127 |
0.178 |
0.254 |
0.381 |
0.508 |
|
|
0.08 |
0.13 |
0.18 |
0.25 |
0.38 |
0.5 |
|
Thickness tolerance: ＼mm(10%) |
0.005 |
0.013 |
0.018 |
0.025 |
0.038 |
0.05 |
|
Width tolerance |
＼5mm,all thickness |
|
Apparent density :g/cm3 |
0.9 to 1.1,all thickness |
|
Moisture content,% |
6.0 to 10.0%,all thickness |
|
PH water extract: |
6.0 to 8.0, all thickness |
|
Ash content,% |
1% maximum |
|
Elongation MD% |
4 |
|
CMD |
9 |
|
No-pollution oil of transformer |
Non-pollution |
|
Coating thickness per side mm |
0.006 to 0.012 |
|
Tensile strength ,N/mm2 |
|
|
Machine direction: |
90 |
90 |
80 |
90 |
92 |
95 |
|
Cross machine direction |
30 |
25 |
35 |
35 |
35 |
35 |
|
Mullen burst strength:Min(Psi) |
40 |
65 |
90 |
150 |
200 |
300 |
|
Dielectric breakdown: |
750 |
1100 |
1700 |
2100 |
3000 |
3300 |
|
(volts/layer,dry test) |
|
Dielectric breakdown: |
5.5 |
8.5 |
10.5 |
14 |
20 |
23.5 |
|
(Kilovolts/layer,oil test) |
|
Bond strength:Psi |
Minimum 40 Psi sheer strengh, tested at 100 degrees 450
Kpa |
|
KPa |
|
