This product is manufactured in strict accordance with the following standards to ensure that the quality complies with national standards and international specifications:
National Standard
GB/T 12706 Power Cables with Extruded Insulation and Their Accessories for Rated Voltages from 1kV (Um=1.2kV) to 35kV (Um=40.5kV)
Part 2: Cables for rated voltages 6kV (Um=7.2kV) to 30kV (Um=36kV)
Part 3: Cables for rated voltage 35kV (Um=40.5kV)
International Standards (Optional):
According to user requirements, production can also follow IEC standards, British Standards (BS), German Standards (DIN), and American Standards (ASTM).
Application Scope
This product is suitable for power transmission and distribution lines with power frequency rated voltages from 3.6/6kV to 26/35kV. It is mainly used for fixed installation in distribution networks or industrial installations, serving as the main line for power transmission and distribution.
Whether installed indoors, in tunnels, cable trenches, or directly buried underground, it can provide safe and reliable power transmission solutions.
Operating Characteristics
• Rated Voltage:
The power frequency rated voltage U0/U is 3.6/6kV–26/35kV.
• Operating Temperature:
The maximum permissible long-term operating temperature of the cable conductor is 90°C.
• Short-Circuit Temperature:
During a short circuit (maximum duration not exceeding 5 seconds), the maximum temperature of the cable conductor shall not exceed 250°C.
• Installation Temperature:
The ambient temperature during cable installation shall not be lower than 0°C.
• Minimum Bending Radius:
Three-core cable: not less than 15 times the cable outer diameter.
Single-core cable: not less than 20 times the cable outer diameter.
Selection of Cable Rated Voltage
The rated voltage of the cable should be suitable for the operating conditions of the cable system and is expressed as U0/U (Um) kV:
• U0: The rated power frequency voltage between the conductor and earth or metallic screen for which the cable is designed.
• U: The rated power frequency voltage between conductors for which the cable is designed.
• Um: The maximum value of the highest system voltage that the equipment can withstand.
Cable Structure
The structure of this product is scientifically designed with multiple protective layers to ensure long-term safe operation:
1. Conductor: High-purity copper or aluminum conductor with excellent electrical conductivity.
2. Conductor Screen: Extruded semi-conductive layer to equalize the electric field.
3. Insulation: XLPE insulation layer, featuring high temperature resistance and high insulation resistance.
4. Insulation Screen: Extruded semi-conductive layer tightly bonded with the insulation layer.
5. Metallic Screen: Copper tape screen or copper wire screen (for high-voltage large cross-section cables), providing a path for short-circuit current.
6. Filling and Binding: Filled with non-hygroscopic materials and bound with non-woven tape.
7. Inner Sheath (Optional): Separates the armoring layer from the insulated cores.
8. Armoring Layer (Optional): Steel tape armoring (for compression resistance) or steel wire armoring (for tensile resistance).
9. Outer Sheath: PVC or PE sheath, providing corrosion resistance and wear resistance.
Main Technical Parameters
• Conductor DC Resistance:
Complies with GB/T 3956, ensuring low-loss transmission.
• AC Withstand Voltage Test:
According to different voltage levels, a 5-minute power frequency AC voltage test and a 4-hour withstand voltage test are carried out to ensure insulation strength.
• Partial Discharge:
At 1.73U0, the maximum partial discharge shall not exceed 5pC, ensuring operational stability.
• Impulse Voltage Test:
Standard impulse voltage tests verify the cable’s resistance to lightning surges.
• Capacitance and Inductance:
Detailed reference values are provided for electrical system calculations.
Current Carrying Capacity and Installation Correction
The current carrying capacity of the cable is affected by installation environment (in air or soil), ambient temperature, soil thermal resistivity, and installation method (single cable or multiple cables in parallel). Jiangnan Cable provides detailed current carrying capacity tables and correction factors, including:
• Correction factors for current carrying capacity under different ambient temperatures.
• Correction factors for current carrying capacity under different soil temperatures and thermal resistivity.
• Correction factors for multiple cables directly buried in soil in parallel and single-layer parallel installation in air.
Rated voltaged of cable applied in three phrase system are given in table.
|
U
|
Um
|
Uo
|
|
First class
|
Second class
|
|
1
|
1.2
|
0.6
|
0.6
|
|
3
|
3.6
|
1.8
|
3.6
|
|
6
|
7.2
|
3.6
|
6
|
|
10
|
12
|
6
|
8.7
|
|
15
|
17.5
|
8.7
|
12
|
|
20
|
24
|
12
|
18
|
|
35
|
42
|
21
|
26
|
The first class cable suitable for one single-phase earth-fault time does not exceed 1 min each time and Max. time mot exceed 8 hours, and not exceed 125 hours in all in one year.
The second class cable suitable for more earth-fault time and more better insulation performance.
XLPE Insulated Power Cable for rated Voltage 3.6/6kV-26/35kV
Type and name of cable
| Type |
Name |
Application |
| YJV |
Copper conductor XLPE insulated PVC sheathed power cable |
For laying indoors in tunnels and direct in ground, not required to bear external mechanical forces. Single-core cable in magnetic duct is not permissible. |
| YJLV |
Aluminium conductor XLPE insulated PVC sheathed power cable |
| YJY |
Copper conductor XLPE insulated PE sheathed power cable |
| YJLY |
Aluminium conductor XLPE insulated PE sheathed power cable |
| YJV22 |
Copper conductor XLPE insulated steel tape armoured PVC sheathed power cable |
For laying indoors in tunnels and direct in ground, required to bear external certain longitudinal mechanical forces |
| YJLV22 |
Aluminium conductor XLPE insulated steel tape armoured PVC sheathed power cable |
| YJV23 |
Copper conductor XLPE insulated steel tape armoured PE sheathed power cable |
| YJLV23 |
Aluminium conductor XLPE insulated steel tape armoured PE sheathed power cable |
| YJV32 |
Copper conductor XLPE insulated fine steel wire armoured PVC sheathed power cable |
For laying indoors in tunnels and direct in ground and wells, required to bear external mechanical forces and determinate pulling force. |
| YJLV32 |
Aluminium conductor XLPE insulated fine steel wire armoured PVC sheathed power cable |
| YJV33 |
Copper conductor XLPE insulated fine steel wire armoured PE sheathed power cable |
| YJLV33 |
Aluminium conductor XLPE insulated fine steel wire armoured PE sheathed power cable |
Production Range of cable
| Conductor |
Type |
Cores |
Rated Voltage kV |
| 3.6/6 |
6/6
6/10 |
8.7/10
8.7/15 |
12/20 |
18/20
18/30 |
21/35 |
26/35 |
| Nominal cross-sectional area mm² |
Copper
Conductor |
YJV
YJY |
1 |
25~1000 |
25~1000 |
25~1000 |
35~1000 |
50~1000 |
50~1000 |
50~1000 |
| 3 |
25~500 |
25~500 |
25~500 |
35~500 |
50~500 |
50~500 |
50~500 |
YJV22
YJV23 |
1 |
25~1000 |
25~1000 |
25~1000 |
35~1000 |
50~1000 |
50~1000 |
50~1000 |
| 3 |
25~500 |
25~500 |
25~500 |
35~500 |
50~500 |
50~500 |
50~500 |
YJV32
YJV33 |
1 |
25~1000 |
25~1000 |
25~1000 |
35~1000 |
50~1000 |
50~1000 |
50~1000 |
| 3 |
25~500 |
25~500 |
25~500 |
35~500 |
50~500 |
50~500 |
50~500 |
Aluminum
Conductor |
YJLV
YJLY |
1 |
50~1000 |
50~1000 |
50~1000 |
35~1000 |
50~1000 |
50~1000 |
50~1000 |
| 3 |
50~500 |
50~500 |
50~500 |
35~500 |
50~500 |
50~500 |
50~500 |
YJLV22
YJLV23 |
1 |
50~1000 |
50~1000 |
50~1000 |
35~1000 |
50~1000 |
50~1000 |
50~1000 |
| 3 |
50~500 |
50~500 |
50~500 |
35~500 |
50~500 |
50~500 |
50~500 |
YJLV32
YJLV33 |
1 |
50~1000 |
50~1000 |
50~1000 |
35~1000 |
50~1000 |
50~1000 |
50~1000 |
| 3 |
50~500 |
50~500 |
50~500 |
35~500 |
50~500 |
50~500 |
50~500 |
Copper wire shielding structure is adopted for the metal shielding of cables with voltage classes of 21/35kV,26/35kV and above 500 square meters nominal cross-section. S is added in the model, such as “YJSV” and “YJLSV22”.
Technical data of cable
D.C resistance of conductor and Conductor maximum short circuit current
|
Nominal cross-sectional area of conductor mm²
|
Max. D.C. resistance at of conductor at 20℃(Ω/km)
|
Conductor maximum short circuit current (is)at 90℃(kA)
|
|
Copper conductor
|
Aluminium conductor
|
Copper conductor
|
Aluminium conductor
|
|
25
|
0.727
|
1.20
|
3.58
|
2.36
|
|
35
|
0.524
|
0.868
|
5.01
|
3.31
|
|
50
|
0.387
|
0.641
|
7.15
|
4.72
|
|
70
|
0.268
|
0.443
|
10.02
|
6.61
|
|
95
|
0.193
|
0.320
|
13.59
|
8.98
|
|
120
|
0.153
|
0.253
|
17.17
|
11.34
|
|
150
|
0.124
|
0.206
|
21.46
|
14.17
|
|
185
|
0.0991
|
0.164
|
26.47
|
17.48
|
|
240
|
0.0754
|
0.125
|
24.34
|
22.68
|
|
300
|
0.0601
|
0.100
|
42.93
|
28.35
|
|
400
|
0.0470
|
0.0778
|
57.23
|
37.79
|
|
500
|
0.0366
|
0.0605
|
71.54
|
47.24
|
|
630
|
0.0283
|
0.0469
|
90.14
|
59.53
|
Voltage test and Partial discharge test
|
No
|
Test items
|
Rated voltage kV
|
|
3.6/6
|
6/6
6/10
|
8.7/10
8.7/15
|
12/20
|
18/20
18/30
|
21/35
|
26/35
|
|
1
|
Power frequency A.C.voltage test KV5min
|
12.5
|
21
|
30.5
|
42
|
63
|
73.5
(53)*
|
91
(65)*
|
|
2
|
A.C.Voltage test for 4 hours KV
|
14.4
|
24
|
34.8
|
48
|
72
|
84
|
104
|
|
3
|
Impulse voltage test kV
|
60
|
75
|
95
|
125
|
170
|
200
|
250
|
|
4
|
Partial discharge test
Maximum discharge at 1.73Uo pC
|
5
|
5
|
5
|
5
|
5
|
5
|
5
|
|
*The power-frequency Voltage test of cables for rated voltage 21/35KV to 26/35KV shall be done upon request according to 2.5 UoX30min or 3.5UoX5min.
|
Max.Rated temperature of the Cable Conductor -----------90℃
Ambient temperature in the Air------------------------------40℃
Ground Temperature------------------------------------------25℃
Soil thermal resitivity------------------------------------------2.0K·m/W
Depth of laid---------------------------------------------------0.8m
Single-circuit only
Single-core cable is installed in parallel. Adjacent space is equivalent to the diameter of the cable.
Rating factors of current carrying for different air temperature
|
Air temperature ℃
|
20
|
25
|
30
|
35
|
40
|
45
|
50
|
|
Rating factor
|
1.18
|
1.14
|
1.09
|
1.05
|
1
|
0.94
|
0.9
|
Rating factors of current carrying for different soil temperature
|
Soil temperature ℃
|
15
|
20
|
25
|
30
|
35
|
40
|
45
|
|
Rating factor
|
1.08
|
1.04
|
1.0
|
0.96
|
0.92
|
0.88
|
0.83
|
Rating factors of current carrying for different thermal resisivity
|
Soil thermal resitivity K·m/W
|
0.8
|
1.0
|
1.5
|
2.0
|
2.5
|
3.0
|
3.5
|
|
Single core
|
1.42
|
1.31
|
1.12
|
1
|
0.91
|
0.83
|
0.75
|
|
Three-cores
|
1.34
|
1.26
|
1.11
|
1
|
0.92
|
0.85
|
0.78
|
Rating factors of cable current carrying capacity under direct buried multiple parallel laying in soil
|
Parallel roots
|
1
|
2
|
3
|
4
|
5
|
6
|
|
Clear distance between cables(mm)
|
100
|
1
|
0.9
|
0.85
|
0.8
|
0.78
|
0.75
|
|
200
|
1
|
0.92
|
0.87
|
0.84
|
0.82
|
0.81
|
|
300
|
1
|
0.93
|
0.9
|
0.87
|
0.86
|
0.85
|
Rating factors of cable current carrying capacity in single-layer and multiple parallel laying in air
|
Parallel roots
|
1
|
2
|
3
|
4
|
5
|
6
|
|
Cable center distance
|
s=d
|
1
|
0.9
|
0.85
|
0.82
|
0.81
|
0.8
|
|
s=2d
|
1
|
1
|
0.98
|
0.95
|
0.93
|
0.9
|
|
S=3d
|
1
|
1
|
1
|
0.98
|
0.97
|
0.96
|
English
