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 (armored cable)
The isolation jacket 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)
Single-core cable can be made of aluminum wire or non-magnetic steel strip.
Multi-core cable can be made of 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 unarmored cable is 20D, multi-core unarmored cable is 15D;
Single-core armored cable is 15D, multi-core armored 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 1.73U0 AC voltage, no more than the background discharge (routine test background discharge is below 10Pc).
Table1:XLPE Nominal thickness of insulation
|
Nominal cross-sectional area mm2 |
XLPENominal 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 section 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 |
Armored cable 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: Rate Current Single Core 3.6/6kV(Um=7.2kV )~26/35kV(Um=42kV) XLPE Insulation
|
Nominalcross-sectional area
|
Burying underground | Single unit in pipeline | Air laying | |||||||||||
| Trilobal | Flat,gap | Trilobal | Flat,gap | Trilobal | Flat,Touch | Flat,gap | ||||||||
| CU | AL | CU | AL | CU | AL | CU | AL | CU | AL | CU | AL | CU | AL | |
| mm2 | A | A | A | A | A | A | A | |||||||
| 10 | 81 | 57 | 83 | 58 | 74 | 52 | 94 | 53 | 94 | 68 | 97 | 70 | 110 | 79 |
| 16 | 106 | 82 | 109 | 84 | 99 | 77 | 100 | 78 | 116 | 90 | 119 | 92 | 138 | 107 |
| 25 | 136 | 105 | 140 | 109 | 128 | 99 | 129 | 100 | 153 | 119 | 156 | 121 | 181 | 141 |
| 35 | 162 | 126 | 167 | 130 | 153 | 118 | 154 | 120 | 186 | 144 | 190 | 147 | 221 | 171 |
| 50 | 192 | 149 | 198 | 153 | 181 | 140 | 183 | 142 | 224 | 174 | 229 | 178 | 266 | 207 |
| 70 | 234 | 182 | 242 | 188 | 222 | 172 | 224 | 174 | 280 | 218 | 287 | 223 | 334 | 259 |
| 95 | 280 | 217 | 289 | 224 | 266 | 206 | 269 | 208 | 343 | 266 | 352 | 273 | 409 | 317 |
| 120 | 319 | 247 | 329 | 256 | 303 | 235 | 306 | 238 | 398 | 309 | 407 | 317 | 474 | 368 |
| 150 | 357 | 277 | 369 | 287 | 341 | 264 | 344 | 267 | 454 | 352 | 465 | 361 | 540 | 419 |
| 185 | 403 | 314 | 417 | 325 | 386 | 300 | 390 | 303 | 522 | 406 | 534 | 417 | 621 | 484 |
| 240 | 467 | 364 | 484 | 377 | 449 | 350 | 454 | 354 | 619 | 483 | 634 | 495 | 736 | 575 |
| 300 | 526 | 411 | 545 | 426 | 509 | 397 | 515 | 401 | 712 | 556 | 728 | 570 | 843 | 659 |
| 400 | 597 | 471 | 618 | 487 | 580 | 456 | 588 | 462 | 825 | 651 | 843 | 667 | 977 | 770 |
| 500 | 657 | 531 | 718 | 567 | 620 | 509 | 678 | 542 | 915 | 751 | 849 | 767 | 1157 | 920 |
| 630 | 707 | 601 | 928 | 667 | 670 | 559 | 788 | 622 | 1025 | 862 | 1054 | 876 | 1357 | 1090 |
| 800 | 757 | 661 | 1048 | 777 | 710 | 599 | 888 | 722 | 1125 | 961 | 1154 | 977 | 1567 | 1280 |
| 1000 | 807 | 721 | 1158 | 877 | 740 | 649 | 988 | 812 | 1215 | 1061 | 1244 | 1077 | 1777 | 1470 |
Rated current conditions:
Ground temperature：20℃
Ambient temperature (air)：30℃
Depth of soil：0.8m
Soil thermal resistance：1.5K•m/ W
Single Core CU&AL/XLPE/PVC Armored & Unarmmored Medium Voltage Power Cables IEC60502-2
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