XLPE INSULATED POWER CABLE
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It applices to the transmission and distribution lines with rated voltage from 0.6/1 kilovolts to 26/35 kilovolts , while flame retardant power cable is used in theplaces with special demands of flame retardant property , where cable is laid tightly
Table of rated voltage for 3 phase cable
U | Um | Uo | |
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1 3 6 10 15 20 35 | 1.2 3.6 7.2 12 17.5 24 42 | 0.6 1.8 3.6 6 8.7 12 21 | 0.6 3.6 6 8.7 12 18 26 |
class 1 applies to system of the duration of syngle phase earthing fault normally less than 1 minutes each time or the system of maximum duration less than 8 hours each time, but the total duration not more than 125 hour.
class 2 applies to system of more duration of earthing fault or the system with higher requirement to property of insulation.
Standards
The products are produced in accordance with GB/T12706-2002, i.e. , Copper or Aluminium Conductor Plastic Insulated Power Cable with Rated Voltage UP to and Including 35 kilovolts,part 3-XLPE Insulated power Cable.
4．Characteristics
-maximum rated temperature of conductor is 90℃
-maximum temperature is 250℃ when cable is shorted for less than 5 seconds
-ambient temperature should be not lower than 0℃ when cable is installed
-minimum bending radius is as follows when cable is installed
五 Key Technical Property(for type test)
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(7.2) |
6/10 |
8.7/15 |
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18/30 |
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Rated voltage, unit: kV | 3.6/6 (7.2) | 6/6 6/10 | 8.7/10 8.7/15 | 12/20 | 18/20 18/30 | 21/35 | 26/35 |
XLPE hot set test Test condition：15min., 20N/cm2 Max. elongation under load Max. elongation after cooling，no load |
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Min. tg δ at AC 2kV and 90±5℃ |
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Mechanical and physical property of insulation and sheath |
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Maximum D.C. resistance at 20 ℃ unit: Ω /km
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2.5 4 6 10 16 25 35 50 70 |
7.41 4.61 3.08 1.83 1.15 0.727 0.524 0.387 0.268 |
12.1 7.41 4.61 3.08 1.91 1.20 0.969 0.641 0.443 |
120 150 185 240 300 400 500 630 800 |
0.153 0.124 0.0991 0.0754 0.0601 0.0470 0.0366 0.0283 0.0221 |
0.253 0.206 0.164 0.125 0.100 0.0778 0.0605 0.0469 0.0367 |
6．Calculation Condition of Ampacity
-ambient temperature is 25℃ (underground) , 40℃ (air).
-conductor working temperature is 90℃
-soil heat resistance coefficient is 1.0℃·m/W , but not consider its rise resulted from water migration when it operates continuously.
-gap between axis of cable and surface of ground is 700 millimeter when it is laid in earth
-for many cable being laid in parallel. gap of axis of cables is 2 ti7．Factor of Affecting Ampacity of Cable
1 Ampacity coefficient when many group of cable are laid
Coefficent when cable is laid horizontally,directly in earth
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XLPE INSULATED POWER CABLE
- Ref Price:
-
- Loading Port:
- China Main Port
- Payment Terms:
- TT OR LC
- Min Order Qty:
- -
- Supply Capability:
- -
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