Heat Shrinkable Creepage Extension Sheds ( Rain Sheds
/ Skirts) are manufactured from high
quality cross linked polyolefin material
that offer exceptional non tracking behavior,
insulation and long term service reliability.
They possess advantageous physical properties,
excellent aging stability and
very good resistance against chemicals.
Due to its excellent combination of properties
as an inbuilt character of the base polymer,
find proven applications in electrical segment
of industries.
The
following are few typical applications
where these extension sheds are used:
- As
an integral part of Heat Shrinkable
terminations upto 72 kv voltage
class for Indoor & outdoor
application where they provide
extension to creepage path of
the cores of the cable terminations.
- To
provide extension creepage length
and to avoid continuity during
rainy season.
|
|
|
Code
|
ØA
|
D
|
D
|
H
|
L
|
T
|
|
(min)
|
s
(min)
|
f
(max)
|
min
|
|
f
(min)
|
| GRS - 130-1 |
91 |
36 |
12 |
17 |
10 |
2.6 |
| GRS - 130-2 |
127 |
51 |
21 |
20 |
10 |
3.5 |
| GRS - 130-3 |
143 |
67 |
31 |
24 |
10 |
3.5 |
| GRS - 130-4 |
143 |
75 |
35 |
24 |
10 |
3.5 |
All dimensions are in mm.
D: Internal diameter s: as supplied; f: after free recovery
TECHNICAL SPECIFICATION
|
Properties
|
Value
|
Standard
|
|
Physical
|
|
|
| Tensile
Strength |
12
N/mm2 (MPA) |
ASTM
D638 |
| Ultimate
Elongation |
350%
(Min.) |
ASTM
D638 |
| Density |
1.15
+/- 0.2 gm/cm3 |
ASTM
D792 |
| Hardness |
45
+/- 10 Shore D |
ASTM
D2240 |
| Water
Absorption |
0.5
% (max.) |
ASTM
D570 |
|
Thermal
|
|
|
Accelerated
Ageing
Tensile Strength
Ultimate Elongation |
(120oC
for 500 Hrs)
11 N/mm2 (Mpa) (min.)
300 % (Min.) |
ASTM
D2671
ASTM D 638
ASTM D 638 |
Low
temperature Flexibility
(-40oC for 4 Hrs.) |
No
Cracking |
ASTM
D2671 |
Heat
Shock
(250oC for 30 Min.) |
No
Cracking or flowing |
ESI
09-11 |
| Shrink
Temperature |
125oC |
IEC
216 |
| Continuous
Temperature limit |
-40oC
to + 100oC |
IEC
216 |
|
Electrical
|
|
|
| Dielectric
Strength |
12
KV/mm. (Min.) |
ASTM
D149 |
| Volume
Resistivity |
1
x 1014 Ohm.cm(min.) |
ASTM
D257 |
| Dielectric
Constant |
5
(Max.) |
ASTM
D150 |
| Resistant
to track & erosion |
No
tracking,erosion or
flame failure upto 3.25
KV for 20 min. |
ASTM |
|
