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High Voltage: 66 kV XLPE Cables > Characteristics |
| High Voltage: 66 kV XLPE Cables : Characteristics |
| Particular
Characteristics of XLPE Insulation |
| |
(Ref : IEC : 60840) |
| Unit |
XLPE |
| Hot Set Test |
|
|
| Treatment |
|
|
| Air temperature |
șC |
200 |
| Tolerance |
șC |
±3 |
| Time under load |
Min |
15 |
| Mechanical Stress |
N/cm2 |
20 |
| Maximum Elongation under load |
% |
175 |
| Maximum permanent Elongation after
cooling |
% |
15 |
| Shrinkage Test |
|
|
| Test sample length L |
mm |
200 |
| Temperature |
șC |
130 |
| Tolerance |
șC |
±3 |
| Duration |
h |
6 |
| Maximum permissible shrinkage |
% |
4 |
|
|
| Mechanical
Characteristics of XPLE Compound (before / after ageing)
|
| |
(Ref : IEC : 60840) |
| Unit |
XLPE |
| Maximum Conductor Temperature
in |
șC |
90 |
normal operation
|
|
|
| Without ageing |
N/m2 |
|
| Tensile Strength, minimum |
% |
12.5 |
| Elongation at break, minimum |
|
|
| After ageing in air oven |
|
200 |
| After ageing in air oven Treatment
-
Temperature
-
Tolerance
-
Duration
|
șC
șC
Days |
135
±3
7 |
| Tensile Strength
|
% |
±25 |
| Elongation at break
|
% |
±25 |
|
|
| Mechanical
Characteristics of PVC ST2, HOPE ST7 Compound (before/after
ageing) |
| Designation of Compounds |
(Ref: IEC :
6O840) |
|
Unit |
PVC |
PE |
| Maximum Conductor |
|
ST2 |
ST7 |
Temperature in normal operation
Without ageing
|
șC |
90 |
90 |
| Tensile Strength, minimum |
N/mm2 |
12.5 |
12.5 |
Elongation at Break, minimum
|
% |
150 |
300 |
| After ageing in air oven treatment
|
șC
Days
|
100
7 |
110
14 |
| Tensile Strength
a) value after ageing, minimum
b) variation, maximum |
N/mm2
% |
12.5
±25 |
-
- |
| Elongation at Break
a) value after ageing, minimum
b) variation, maximum |
%
% |
150
±25 |
300
- |
|
|
