 |
| Fig- Crossectional View of XLPE Power Cable |
Continuous Current Ratings Correction Factor Varies on Different Cable Laying Conditions
Today we will try to find how various laying conditions of cable become a factor for current ratings of XLPE insulated copper conductor power cables, means depends on cable laying various condition current carrying capacity increase or decrease. Such as various ambient air temperatures, various ground temperatures, various thermal resistivity of ground and various depth of cable laying is the factor for cable current ratings.
In our previous post Continuous Current Ratings of XLPE Insulated Power Cable we try to find the
current carrying capacity for various sheathed like Aluminium, Lead or Copper
wire shield XLPE insulated copper cable.
To
determine current capacity for the various laying conditions than those
indicated on the every table, multiply table values by the correction factors
shown below.
Correction Factors for Various Ambient Air Temperatures
Air Temperature(oC)
|
20 oC
|
25 oC
|
30 oC
|
35 oC
|
40 oC
|
45 oC
|
50 oC
|
Rating
Factors
|
1.2
|
1.16
|
1.10
|
1.05
|
1.0
|
0.94
|
0.88
|
Air
Temperature(oC)
|
15 oC
|
20 oC
|
25 oC
|
30 oC
|
35 oC
|
40 oC
|
45 oC
|
Rating
Factors
|
1.08
|
1.04
|
1.00
|
0.96
|
0.91
|
0.87
|
0.83
|
Thermal
Resistivity of Soil (oCm/w)
|
0.7
|
1.0
|
1.2
|
1.5
|
2.0
|
2.5
|
3.0
|
Rating
Factors
|
1.14
|
1.00
|
0.93
|
0.84
|
0.74
|
0.67
|
0.61
|
Correction Factors for Various Ground Temperature
Correction Factors for Various Thermal Resistivity of Ground
Correction Factors for Various Depth of Laying
Correction Factors for Various Depth of Laying
Sponsored:
Depth of Laying (m)
|
Rating Factor
|
0.50 ~ 0.70 |
1.09 |
0.71 ~ 0.90 |
1.05 |
0.91 ~ 1.10 |
1.03 |
1.11 ~ 1.30 |
1.01 |
1.31 ~ 1.50 |
1.00 |
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