Standard: IEC60502-2
Structure:
1.Conductor
Copper or Aluminum conductor, in accordance with IEC60228 Class 2.
2.Conductor screen
A cross-linked semi-conductive material.The thickness of the conductor shield is 0.6-0.8mm.
3.Insulation
The insulation employs 35kV cross-linked polyethylene material.The XLPE specifications in IEC 60502-2.
(Insulation thickness details are specified in Table 1)
4.Insulation shielding
The insulation shielding layer employs an adhesive cross-linked semi conductive material uniformly. The shielding layer thickness ranges from 0.8 to 1 mm. The material with a peel strength of 4-45 N.
5.Metallic screen：
Copper wire or Copper strips.
(See Table 2 and 3 respectively for the total cross-sectional area of copper wire shielding and the shielding layer of copper strips)
6.Filling and wrapping lining
Non-hygroscopic material,wrapped with appropriate tapes（Limited to multi-core）.
7.Inner sheath (armoured cable)
The inner sheath is constructed with an extruded PVC layer, PE, or LSZH. The extruded layer typically has a thickness of 0.02Du+0.6mm.
8.Armouring layer (for armoured cable)
Steel wire or Steel strip.
( The diameter of round steel wire is shown in Table 4)
9.Outer sheath
PVC & PE & LSZH,The standard outer sheath thickness is 0.035+D.
Cable properties
Working temperature:
90 °C (XLPE or EPR insulation)
Temperature range:
-15 °C(PVC sheath); -40 °C (PE sheath)
Short circuit temperature (maximum duration of short circuit is not more than 5s):
250°C (XLPE insulation)
Minimum bending radius of cable laying (D is the approximate outer diameter of cable):
Single-core unarmoured cable is 20D, multi-core unarmoured cable is 15D;
Single-core armoured cable is 15D, multi-core armoured cable is 12D;
Alternating voltage withstand test:
The cable withstands alternating voltage 4U0 for 5 minutes, and the insulation is not broken.
Partial discharge test:
The cable under 1.73 U0 AC voltage, no more than the background discharge (routine test background discharge is below 10Pc).
Table1:XLPE Nominal thickness of insulation
Nominal cross-section alarea mm2 | XLPE Nominal thickness of insulation | ||||||
3.6/6kV (Um=7.2kV) mm | 6/10kV (Um=12kV) mm | 8.7/15kV (Um=17.5kV) mm | 12/20kV (Um=24kV) mm | 18/30kV (Um=36kV) mm | 21/35kV (Um=42kV) mm | 26/35kV (Um=42kV) mm | |
| 10 | 2.5 | - | - | - | - | - | - |
| 16 | 2.5 | 3.4 | - | - | - | - | - |
| 25 | 2.5 | 3.4 | 4.5 | - | - | - | - |
| 35 | 2.5 | 3.4 | 4.5 | 5.5 | - | - | - |
| 50–185 | 2.5 | 3.4 | 4.5 | 5.5 | 8 | 9.3 | 10.5 |
| 240 | 2.6 | 3.4 | 4.5 | 5.5 | 8 | 9.3 | 10.5 |
| 300 | 2.8 | 3.4 | 4.5 | 5.5 | 8 | 9.3 | 10.5 |
| 400 | 3 | 3.4 | 4.5 | 5.5 | 8 | 9.3 | 10.5 |
| 500-630 | 3.2 | 3.4 | 4.5 | 5.5 | 8 | 9.3 | 10.5 |
Table2: Total cross section of copper strip shielding
Nominalcross-sectional area mm2 | Totalcross-sectionalarea&maximumDCresistance | |||||||||
| 3.6/6kV(Um=7.2kV) | 6/10kV(Um=12kV) | 8.7/15kV(Um=17.5kV) | 12/20kV(Um=24kV) | 18/30kV(Um=36kV) | ||||||
Totalcross-section mm | 20℃maximum DC resistance Ω/km | Totalcross-section mm | 20℃maximum DC resistance Ω/km | Totalcross-section mm | 20℃maximum DC resistance Ω/km | Totalcross-section mm | 20℃maximum DC resistance Ω/km | Totalcross-section mm | 20℃maximum DC resistance Ω/km | |
| 10 | 4.7 | 3.610 | - | - | - | - | - | - | - | - |
| 16 | 5.2 | 3.309 | 6.0 | 2.896 | - | - | - | - | - | - |
| 25 | 5.8 | 2.995 | 6.5 | 2.652 | 7.4 | 2.327 | 8.2 | 2.093 | - | - |
| 35 | 6.3 | 2.768 | 7.0 | 2.473 | 7.9 | 2.188 | 8.7 | 1.980 | - | - |
| 50 | 6.8 | 2.543 | 7.5 | 2.291 | 8.4 | 2.044 | 9.2 | 1.861 | 11.3 | 0.573 |
| 70 | 7.5 | 2.291 | 8.3 | 2.085 | 9.2 | 1.878 | 10.0 | 1.723 | 12.0 | 0.538 |
| 95 | 8.3 | 2.074 | 9.0 | 2.896 | 9.9 | 1.731 | 10.8 | 1.598 | 12.8 | 0.505 |
| 120 | 9.1 | 1.886 | 9.9 | 2.652 | 10.8 | 1.597 | 11.6 | 1.483 | 13.6 | 0.474 |
| 150 | 9.8 | 1.763 | 10.5 | 2.473 | 11.4 | 1.508 | 12.2 | 1.406 | 14.3 | 0.453 |
| 185 | 10.7 | 1.610 | 11.3 | 2.291 | 12.3 | 1.393 | 13.0 | 1.322 | 15.0 | 0.430 |
| 240 | 11.8 | 1.450 | 12.5 | 2.085 | 2.1 | 1.281 | 14.2 | 1.207 | 16.4 | 0.397 |
| 300 | 13.0 | 1.321 | 13.5 | 1.904 | 1.9 | 1.192 | 15.3 | 1.128 | 17.3 | 0.374 |
| 400 | 14.4 | 1.193 | 14.7 | 1.744 | 1.8 | 1.099 | 16.5 | 1.044 | 18.6 | 0.350 |
| 500 | 15.9 | 1.083 | 16.4 | 1.639 | 1.7 | 0.995 | 17.7 | 0.972 | 20.2 | 0.322 |
| 630 | 17.5 | 0.982 | 19.1 | 1.525 | 1.6 | 0.909 | 19.7 | 0.871 | 21.8 | 0.297 |
Table3:Total cross-sectional area of copper wire shielding
Nominalcross-sectional area mm2 | Total cross-sectional area | Maximum DC resistance under 20 C copper wire shielding Ω/km | ||||
| 3.6/6kV | 6/10kV | 8.7/15kV | 12/20kV | 18/30kV | ||
| (Um=7.2kV) | (Um=12kV) | (Um=17.5kV) | (Um=24kV) | (Um=36kV) | ||
| mm² | mm | mm | mm | mm | mm | Ω |
| 10 | 10 | 10 | 10 | 10 | 10 | 1.075 |
| 16 | 16 | 16 | 16 | 16 | 16 | 1.075 |
| 25 | 16 | 16 | 16 | 16 | 16 | 1.075 |
| 35 | 16 | 16 | 16 | 16 | 16 | 1.075 |
| 50 | 16 | 16 | 16 | 16 | 16 | 1.075 |
| 70 | 16 | 16 | 16 | 16 | 16 | 1.075 |
| 95 | 16 | 16 | 16 | 16 | 16 | 1.075 |
| 120 | 16 | 16 | 16 | 16 | 16 | 1.075 |
| 150 | 25 | 25 | 25 | 25 | 25 | 0.688 |
| 185 | 25 | 25 | 25 | 25 | 25 | 0.688 |
| 240 | 25 | 25 | 25 | 25 | 25 | 0.688 |
| 300 | 25 | 25 | 25 | 25 | 25 | 0.688 |
| 400 | 35 | 35 | 35 | 35 | 35 | 0.491 |
| 500 | 35 | 35 | 35 | 35 | 35 | 0.491 |
| 630 | 35 | 35 | 35 | 35 | 35 | 0.491 |
| 800 | 50 | 50 | 50 | 50 | 50 | 0.344 |
| 1000 | 50 | 50 | 50 | 50 | 50 | 0.344 |
Table4:Diameter of steel wire armoured cable
Virtual diameter under armor layer mm | armouredcable diameter mm |
| ≤10 | 0.8 |
| ＞10and ≤15 | 1.25 |
| ＞15and ≤25 | 1.6 |
| ＞25and ≤35 | 2.0 |
| ＞35and ≤60 | 2.5 |
| ＞60 | 3.15 |
Table5: Rated Current Three Core 3.6/6kV(Um=7.2kV )~26/35kV(Um=42kV) XLPE Insulation
Nominalcross-sectional area mm2 | Unarmoured | Armour | ||||||||||
| Burying underground | Single unit in pipeline | Air laying | Burying underground | Single unit in pipeline | Air laying | |||||||
| CU | AL | CU | AL | CU | AL | CU | AL | CU | AL | CU | AL | |
| A | A | A | A | A | A | |||||||
| 10 | 76 | 53 | 62 | 42 | 87 | 62 | 76 | 53 | 63 | 43 | 88 | 63 |
| 16 | 101 | 78 | 87 | 67 | 109 | 84 | 101 | 78 | 88 | 68 | 110 | 85 |
| 25 | 129 | 100 | 112 | 87 | 142 | 110 | 129 | 100 | 112 | 87 | 143 | 111 |
| 35 | 153 | 119 | 133 | 103 | 170 | 132 | 154 | 119 | 134 | 104 | 172 | 133 |
| 50 | 181 | 140 | 158 | 122 | 204 | 158 | 181 | 140 | 158 | 123 | 205 | 159 |
| 70 | 221 | 171 | 193 | 150 | 253 | 196 | 220 | 171 | 194 | 150 | 253 | 196 |
| 95 | 262 | 203 | 231 | 179 | 304 | 236 | 263 | 204 | 232 | 180 | 307 | 238 |
| 120 | 298 | 232 | 264 | 205 | 351 | 273 | 298 | 232 | 264 | 206 | 352 | 274 |
| 150 | 334 | 260 | 297 | 231 | 398 | 309 | 332 | 259 | 296 | 231 | 397 | 309 |
| 185 | 377 | 294 | 336 | 262 | 455 | 355 | 374 | 293 | 335 | 262 | 453 | 354 |
| 240 | 434 | 340 | 390 | 305 | 531 | 415 | 431 | 338 | 387 | 304 | 529 | 415 |
| 300 | 489 | 384 | 441 | 346 | 606 | 475 | 482 | 380 | 435 | 343 | 599 | 472 |
| 400 | 553 | 438 | 501 | 398 | 696 | 552 | 541 | 432 | 492 | 393 | 683 | 545 |
| 500 | 613 | 498 | 541 | 451 | 786 | 652 | 601 | 492 | 532 | 446 | 773 | 645 |
| 630 | 663 | 568 | 591 | 501 | 896 | 762 | 651 | 562 | 582 | 496 | 883 | 755 |
Rated current conditions:
Ground temperature: 20℃
Ambient temperature (air): 30℃
Depth of soil: 0.8m
Soil thermal resistance: 1.5K•m/ W
Three Core CU&AL/XLPE/PVC Armoured & Unarmoured Medium Voltage Power Cables IEC60502-2
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