High Voltage Power Cable
High Voltage Power Cable is used for the transmission and distribution of electric power and is suitable for installation in ducts, trenches or direct buried underground or within buildings. These cables are ideal for use to connect wind farms and other renewable energy to existing grid systems.
- Standard IEC 60840, IEC 62067
Construction
Technical Specifications
Quality Control
Application
Construction
High Voltage Power Cable
Conductor
The conductor consists of annealed copper or hard aluminum stranded wires and is classified into three (3) major types of concentric, compacted circular, and segmental compacted circular.
Insulation
The insulation material is extruded cross-linked polyethylene. The conductor screen, the insulation, and the insulation screen mentioned to the following clause are extruded simultaneously in one process to ensure that the screen and insulation are intimately bonded together and free from all possibilities of voids between layers.
Conductor Screen
The conductor screen consists of an extruded semi-conducting polyethylene to minimize electrical stresses due to the stranded configuration of the conductor. The semi-conducting material used for the conductor screen has no deleterious effect on the conductor. Semi-conducting tape is sometimes applied as a separator.
Insulation Screen
The insulation screen is provided over the insulation by extruding the semi-conducting compound concentrically and circularly to minimize the possibility of ionization on the outer surface of the dielectric.
Metallic Screen
The metallic screen consists of the wire shield, the corrugated aluminum sheath, or the lead sheath. The corrugated aluminum sheath and the lead sheath are also adopted where the surface of the duct is poor and where moisture is high.
Outer Sheath
To protect the metallic sheath from electrical or chemical corrosion, it is covered by PE or PVC.
Technical Specifications
High Voltage Power Cable
36/66 (72.5) kV with Aluminum Sheath
36/66 (72.5) kV with Lead Sheath
36/66 (72.5) kV with Copper Wire Shield
64/110 (123) kV with Aluminum Sheath
64/110 (123) kV with Lead Sheath
64/110 (123) kV with Copper Wire Shield
76/132 (145) kV with Aluminum Sheath
76/132 (145) kV with Lead Sheath
76/132 (145) kV with Copper Wire Shield
87/161 (170) kV with Aluminum Sheath
87/161 (170) kV with Lead Sheath
87/161 (170) kV with Copper Wire Shield
127/230 (245) kV with Aluminum Sheath
127/230 (245) kV with Lead Sheath
127/230 (245) kV with Copper Wire Shield
| Continuous Current Ratings for Single Circuit (A) | ||||
|---|---|---|---|---|
| Cross-Sectional Area(mm2) | Direct Buried | Pipe Duct | In Air | |
| Trefoil | Flat(S=2D) | |||
| 240 | 524 | 491 | 598 | 671 |
| 300 | 592 | 556 | 682 | 770 |
| 400 | 671 | 631 | 781 | 888 |
| 500 | 762 | 714 | 894 | 1025 |
| 630 | 878 | 808 | 1023 | 1187 |
| 800 | 965 | 928 | 1150 | 1355 |
| 1000 | 1119 | 1075 | 1361 | 1615 |
| 1200 | 1198 | 1146 | 1460 | 1745 |
| 1600 | 1352 | 1357 | 1654 | 2030 |
| 2000 | 1468 | 1475 | 1800 | 2273 |
| Conductor |
Thickness of Conductor Screen Approx. |
Thickness of Insulation |
Thickness of Insulation Screen Approx. | Thickness of Aluminum Sheath |
Thickness of Outer Sheath |
Outer Diameter of Cable |
Weight of Cable |
Max. DC Conductor Resistance at 20 °C | Capacitance | ||
| Cross-Sectional Area | Shape | Diameter | |||||||||
| mm² | mm | mm | mm | mm | mm | mm | mm | kg/m | Ω/km | μF/km | |
| 240 | Compact Round Stranded | 18.1 | 1.0 | 11.0 | 1.0 | 1.6 | 3.5 | 69 | 5.5 | 0.0754 | 0.20 |
| 300 | 20.4 | 1.0 | 11.0 | 1.0 | 1.6 | 3.5 | 72 | 6.3 | 0.0601 | 0.21 | |
| 400 | 23.2 | 1.0 | 11.0 | 1.0 | 1.7 | 3.5 | 75 | 7.2 | 0.0470 | 0.23 | |
| 500 | 26.3 | 1.0 | 11.0 | 1.0 | 1.8 | 4.0 | 79 | 8.6 | 0.0366 | 0.25 | |
| 630 | 30.2 | 1.0 | 11.0 | 1.0 | 1.8 | 4.0 | 83 | 10.1 | 0.0283 | 0.28 | |
| 800 | 34.0 | 1.0 | 11.0 | 1.0 | 1.9 | 4.0 | 87 | 12 | 0.0221 | 0.30 | |
| 1000 | Segment Stranded (Miliken) | 38.7 | 1.0 | 11.0 | 1.0 | 2.0 | 4.0 | 92 | 14.4 | 0.0176 | 0.33 |
| 1200 | 41.8 | 1.0 | 11.0 | 1.0 | 2.1 | 4.5 | 98 | 16.7 | 0.0151 | 0.36 | |
| 1600 | 48.1 | 1.0 | 11.0 | 1.0 | 2.2 | 4.5 | 105 | 20.9 | 0.0113 | 0.40 | |
| 2000 | 54.3 | 1.0 | 11.0 | 1.0 | 2.4 | 4.5 | 112 | 25.4 | 0.0090 | 0.44 | |
| Continuous Current Ratings for Single Circuit (A) | ||||
|---|---|---|---|---|
| Cross-Sectional Area(mm2) | Direct Buried | Pipe Duct | In Air | |
| Trefoil | Flat(S=2D) | |||
| 240 | 535 | 525 | 621 | 706 |
| 300 | 606 | 567 | 710 | 810 |
| 400 | 691 | 646 | 822 | 942 |
| 500 | 787 | 733 | 951 | 1098 |
| 630 | 898 | 833 | 1096 | 1274 |
| 800 | 1008 | 958 | 1243 | 1462 |
| 1000 | 1184 | 1121 | 1505 | 1759 |
| 1200 | 1282 | 1208 | 1648 | 1938 |
| 1600 | 1469 | 1434 | 1906 | 2282 |
| 2000 | 1626 | 1585 | 2130 | 2597 |
| Conductor |
Thickness of Conductor Screen Approx. |
Thickness of Insulation |
Thickness of Insulation Screen Approx. | Thickness of Aluminum Sheath |
Thickness of Outer Sheath |
Outer Diameter of Cable |
Weight of Cable |
Max. DC Conductor Resistance at 20 °C | Capacitance | ||
| Cross-Sectional Area | Shape | Diameter | |||||||||
| mm² | mm | mm | mm | mm | mm | mm | mm | kg/m | Ω/km | μF/km | |
| 240 | Compact Round Stranded | 18.1 | 1.0 | 11.0 | 1.0 | 2.1 | 3.5 | 62 | 8.1 | 0.0754 | 0.20 |
| 300 | 20.4 | 1.0 | 11.0 | 1.0 | 2.2 | 3.5 | 64 | 9.1 | 0.0601 | 0.21 | |
| 400 | 23.2 | 1.0 | 11.0 | 1.0 | 2.3 | 3.5 | 67 | 10.5 | 0.0470 | 0.23 | |
| 500 | 26.3 | 1.0 | 11.0 | 1.0 | 2.4 | 4.0 | 72 | 12.5 | 0.0366 | 0.25 | |
| 630 | 30.2 | 1.0 | 11.0 | 1.0 | 2.4 | 4.0 | 76 | 14.2 | 0.0283 | 0.28 | |
| 800 | 34.0 | 1.0 | 11.0 | 1.0 | 2.6 | 4.0 | 80 | 16.9 | 0.0221 | 0.30 | |
| 1000 | Segment Stranded (Miliken) | 38.7 | 1.0 | 11.0 | 1.0 | 2.7 | 4.0 | 85 | 19.9 | 0.0176 | 0.33 |
| 1200 | 41.8 | 1.0 | 11.0 | 1.0 | 2.8 | 4.5 | 91 | 23.0 | 0.0151 | 0.36 | |
| 1600 | 48.1 | 1.0 | 11.0 | 1.0 | 3.0 | 4.5 | 97 | 28.0 | 0.0113 | 0.40 | |
| 2000 | 54.3 | 1.0 | 11.0 | 1.0 | 3.2 | 4.5 | 104 | 33.4 | 0.0090 | 0.44 | |
| Continuous Current Ratings for Single Circuit (A) | ||||
|---|---|---|---|---|
| Cross-Sectional Area(mm2) | Direct Buried | Pipe Duct | In Air | |
| Trefoil | Flat(S=2D) | |||
| 240 | 530 | 483 | 606 | 692 |
| 300 | 599 | 544 | 693 | 795 |
| 400 | 683 | 616 | 802 | 925 |
| 500 | 780 | 729 | 929 | 1075 |
| 630 | 886 | 828 | 1066 | 1247 |
| 800 | 997 | 929 | 1210 | 1432 |
| 1000 | 1173 | 1087 | 1473 | 1728 |
| 1200 | 1270 | 1173 | 1611 | 1894 |
| 1600 | 1465 | 1375 | 1883 | 2245 |
| 2000 | 1627 | 1530 | 2111 | 2556 |
| Conductor |
Thickness of Conductor Screen Approx. |
Thickness of Insulation |
Thickness of Insulation Screen Approx. | Thickness of Aluminum Sheath |
Thickness of Outer Sheath |
Outer Diameter of Cable |
Weight of Cable |
Max. DC Conductor Resistance at 20 °C | Capacitance | ||
| Cross-Sectional Area | Shape | Diameter | |||||||||
| mm² | mm | mm | mm | mm | mm | mm | mm | kg/m | Ω/km | μF/km | |
| 240 | Compact Round Stranded | 18.1 | 1.0 | 11.0 | 1.0 | 1.2×40 | 3.5 | 58 | 4.4 | 0.0754 | 0.20 |
| 300 | 20.4 | 1.0 | 11.0 | 1.0 | 1.2×40 | 3.5 | 60 | 5.1 | 0.0601 | 0.21 | |
| 400 | 23.2 | 1.0 | 11.0 | 1.0 | 1.2×40 | 3.5 | 63 | 5.9 | 0.0470 | 0.23 | |
| 500 | 26.3 | 1.0 | 11.0 | 1.0 | 1.2×40 | 4.0 | 66 | 7.2 | 0.0366 | 0.25 | |
| 630 | 30.2 | 1.0 | 11.0 | 1.0 | 1.2×40 | 4.0 | 71 | 8.6 | 0.0283 | 0.28 | |
| 800 | 34.0 | 1.0 | 11.0 | 1.0 | 1.2×40 | 4.0 | 75 | 10.4 | 0.0221 | 0.30 | |
| 1000 | Segment Stranded (Miliken) | 38.7 | 1.0 | 11.0 | 1.0 | 1.2×40 | 4.0 | 80 | 12.7 | 0.0176 | 0.33 |
| 1200 | 41.8 | 1.0 | 11.0 | 1.0 | 1.2×40 | 4.5 | 85 | 14.7 | 0.0151 | 0.36 | |
| 1600 | 48.1 | 1.0 | 11.0 | 1.0 | 1.2×40 | 4.5 | 91 | 18.7 | 0.0113 | 0.40 | |
| 2000 | 54.3 | 1.0 | 11.0 | 1.0 | 1.2×40 | 4.5 | 97 | 22.7 | 0.0090 | 0.44 | |
| Continuous Current Ratings for Single Circuit (A) | ||||
|---|---|---|---|---|
| Cross-Sectional Area(mm2) | Direct Buried | Pipe Duct | In Air | |
| Trefoil | Flat(S=2D) | |||
| 240 | 530 | 483 | 606 | 692 |
| 300 | 599 | 544 | 693 | 795 |
| 400 | 683 | 616 | 802 | 925 |
| 500 | 780 | 729 | 929 | 1075 |
| 630 | 886 | 828 | 1066 | 1247 |
| 800 | 997 | 929 | 1210 | 1432 |
| 1000 | 1173 | 1087 | 1473 | 1728 |
| 1200 | 1270 | 1173 | 1611 | 1894 |
| 1600 | 1465 | 1375 | 1883 | 2245 |
| 2000 | 1627 | 1530 | 2111 | 2556 |
| Conductor |
Thickness of Conductor Screen Approx. |
Thickness of Insulation |
Thickness of Insulation Screen Approx. | Thickness of Aluminum Sheath |
Thickness of Outer Sheath |
Outer Diameter of Cable |
Weight of Cable |
Max. DC Conductor Resistance at 20 °C | Capacitance | ||
| Cross-Sectional Area | Shape | Diameter | |||||||||
| mm² | mm | mm | mm | mm | mm | mm | mm | kg/m | Ω/km | μF/km | |
| 240 | Compact Round Stranded | 18.1 | 1.0 | 11.0 | 1.0 | 1.2×40 | 3.5 | 58 | 4.4 | 0.0754 | 0.20 |
| 300 | 20.4 | 1.0 | 11.0 | 1.0 | 1.2×40 | 3.5 | 60 | 5.1 | 0.0601 | 0.21 | |
| 400 | 23.2 | 1.0 | 11.0 | 1.0 | 1.2×40 | 3.5 | 63 | 5.9 | 0.0470 | 0.23 | |
| 500 | 26.3 | 1.0 | 11.0 | 1.0 | 1.2×40 | 4.0 | 66 | 7.2 | 0.0366 | 0.25 | |
| 630 | 30.2 | 1.0 | 11.0 | 1.0 | 1.2×40 | 4.0 | 71 | 8.6 | 0.0283 | 0.28 | |
| 800 | 34.0 | 1.0 | 11.0 | 1.0 | 1.2×40 | 4.0 | 75 | 10.4 | 0.0221 | 0.30 | |
| 1000 | Segment Stranded (Miliken) | 38.7 | 1.0 | 11.0 | 1.0 | 1.2×40 | 4.0 | 80 | 12.7 | 0.0176 | 0.33 |
| 1200 | 41.8 | 1.0 | 11.0 | 1.0 | 1.2×40 | 4.5 | 85 | 14.7 | 0.0151 | 0.36 | |
| 1600 | 48.1 | 1.0 | 11.0 | 1.0 | 1.2×40 | 4.5 | 91 | 18.7 | 0.0113 | 0.40 | |
| 2000 | 54.3 | 1.0 | 11.0 | 1.0 | 1.2×40 | 4.5 | 97 | 22.7 | 0.0090 | 0.44 | |
| Continuous Current Ratings for Single Circuit (A) | ||||
|---|---|---|---|---|
| Cross-Sectional Area(mm2) | Direct Buried | Pipe Duct | In Air | |
| Trefoil | Flat(S=2D) | |||
| 240 | 533 | 498 | 617 | 692 |
| 300 | 602 | 563 | 705 | 794 |
| 400 | 687 | 654 | 816 | 923 |
| 500 | 782 | 744 | 939 | 1068 |
| 630 | 891 | 846 | 1083 | 1243 |
| 800 | 1001 | 949 | 1229 | 1425 |
| 1000 | 1176 | 1108 | 1468 | 1718 |
| 1200 | 1269 | 1235 | 1612 | 1871 |
| 1600 | 1455 | 1415 | 1870 | 2206 |
| 2000 | 1609 | 1562 | 2087 | 2505 |
| 2500 | 1695 | 1647 | 2201 | 2642 |
| Conductor |
Thickness of Conductor Screen Approx. |
Thickness of Insulation |
Thickness of Insulation Screen Approx. | Thickness of Aluminum Sheath |
Thickness of Outer Sheath |
Outer Diameter of Cable |
Weight of Cable |
Max. DC Conductor Resistance at 20 °C | Capacitance | ||
| Cross-Sectional Area | Shape | Diameter | |||||||||
| mm² | mm | mm | mm | mm | mm | mm | mm | kg/m | Ω/km | μF/km | |
| 240 | Compact Round Stranded | 18.1 | 1.2 | 14.0 | 1.0 | 2.3 | 3.5 | 68 | 9.6 | 0.0754 | 0.17 |
| 300 | 20.4 | 1.2 | 14.0 | 1.0 | 2.4 | 3.5 | 71 | 10.9 | 0.0601 | 0.18 | |
| 400 | 23.2 | 1.2 | 14.0 | 1.0 | 2.5 | 3.5 | 74 | 12.3 | 0.0470 | 0.20 | |
| 500 | 26.3 | 1.2 | 14.0 | 1.0 | 2.5 | 4.0 | 78 | 13.8 | 0.0366 | 0.21 | |
| 630 | 30.2 | 1.2 | 14.0 | 1.0 | 2.6 | 4.0 | 82 | 16.0 | 0.0283 | 0.23 | |
| 800 | 34.0 | 1.2 | 14.0 | 1.0 | 2.7 | 4.0 | 86 | 18.5 | 0.0221 | 0.25 | |
| 1000 | Segment Stranded (Miliken) | 38.7 | 1.2 | 14.0 | 1.0 | 2.9 | 4.0 | 92 | 21.9 | 0.0176 | 0.28 |
| 1200 | 41.8 | 1.2 | 14.0 | 1.0 | 3.0 | 4.5 | 97 | 24.7 | 0.0151 | 0.30 | |
| 1600 | 48.1 | 1.2 | 14.0 | 1.0 | 3.2 | 4.5 | 103 | 30.1 | 0.0113 | 0.33 | |
| 2000 | 54.3 | 1.2 | 14.0 | 1.0 | 3.4 | 4.5 | 110 | 35.7 | 0.0090 | 0.36 | |
| 2500 | 63.0 | 1.2 | 14.0 | 1.0 | 3.6 | 4.5 | 118 | 42.0 | 0.0072 | 0.40 | |
| Continuous Current Ratings for Single Circuit (A) | ||||
|---|---|---|---|---|
| Cross-Sectional Area(mm2) | Direct Buried | Pipe Duct | In Air | |
| Trefoil | Flat(S=2D) | |||
| 240 | 528 | 495 | 605 | 682 |
| 300 | 597 | 559 | 692 | 793 |
| 400 | 681 | 650 | 800 | 909 |
| 500 | 775 | 739 | 922 | 1053 |
| 630 | 884 | 841 | 1065 | 1226 |
| 800 | 994 | 945 | 1208 | 1406 |
| 1000 | 1169 | 1106 | 1465 | 1695 |
| 1200 | 1264 | 1231 | 1595 | 1849 |
| 1600 | 1456 | 1415 | 1860 | 2185 |
| 2000 | 1618 | 1570 | 2089 | 2487 |
| 2500 | 1706 | 1656 | 2203 | 2623 |
| Conductor |
Thickness of Conductor Screen Approx. |
Thickness of Insulation |
Thickness of Insulation Screen Approx. | Thickness of Aluminum Sheath |
Thickness of Outer Sheath |
Outer Diameter of Cable |
Weight of Cable |
Max. DC Conductor Resistance at 20 °C | Capacitance | ||
| Cross-Sectional Area | Shape | Diameter | |||||||||
| mm² | mm | mm | mm | mm | mm | mm | mm | kg/m | Ω/km | μF/km | |
| 240 | Compact Round Stranded | 18.1 | 1.2 | 14.0 | 1.0 | 1.2×40 | 3.5 | 64 | 5.0 | 0.0754 | 0.17 |
| 300 | 20.4 | 1.2 | 14.0 | 1.0 | 1.2×40 | 3.5 | 66 | 5.7 | 0.0601 | 0.18 | |
| 400 | 23.2 | 1.2 | 14.0 | 1.0 | 1.2×40 | 3.5 | 69 | 6.6 | 0.0470 | 0.20 | |
| 500 | 26.3 | 1.2 | 14.0 | 1.0 | 1.2×40 | 4.0 | 73 | 7.9 | 0.0366 | 0.21 | |
| 630 | 30.2 | 1.2 | 14.0 | 1.0 | 1.2×40 | 4.0 | 77 | 9.4 | 0.0283 | 0.23 | |
| 800 | 34.0 | 1.2 | 14.0 | 1.0 | 1.2×40 | 4.0 | 81 | 11.2 | 0.0221 | 0.25 | |
| 1000 | Segment Stranded (Miliken) | 38.7 | 1.2 | 14.0 | 1.0 | 1.2×40 | 4.0 | 86 | 13.6 | 0.0176 | 0.28 |
| 1200 | 41.8 | 1.2 | 14.0 | 1.0 | 1.2×40 | 4.5 | 91 | 15.6 | 0.0151 | 0.30 | |
| 1600 | 48.1 | 1.2 | 14.0 | 1.0 | 1.2×40 | 4.5 | 97 | 19.6 | 0.0113 | 0.33 | |
| 2000 | 54.3 | 1.2 | 14.0 | 1.0 | 1.2×40 | 4.5 | 103 | 23.7 | 0.0090 | 0.36 | |
| 2500 | 63.0 | 1.2 | 14.0 | 1.0 | 1.2×40 | 4.5 | 111 | 29.0 | 0.0072 | 0.40 | |
| Continuous Current Ratings for Single Circuit (A) | ||||
|---|---|---|---|---|
| Cross-Sectional Area(mm2) | Direct Buried | Pipe Duct | In Air | |
| Trefoil | Flat(S=2D) | |||
| 240 | 519 | 486 | 589 | 649 |
| 300 | 585 | 547 | 671 | 742 |
| 400 | 665 | 635 | 770 | 858 |
| 500 | 755 | 716 | 883 | 992 |
| 630 | 856 | 814 | 1011 | 1151 |
| 800 | 956 | 942 | 1137 | 1313 |
| 1000 | 1103 | 1093 | 1333 | 1555 |
| 1200 | 1185 | 1170 | 1439 | 1695 |
| 1600 | 1333 | 1324 | 1627 | 1972 |
| 2000 | 1452 | 1435 | 1777 | 2211 |
| 2500 | 1530 | 1512 | 1872 | 2330 |
| Conductor |
Thickness of Conductor Screen Approx. |
Thickness of Insulation |
Thickness of Insulation Screen Approx. | Thickness of Aluminum Sheath |
Thickness of Outer Sheath |
Outer Diameter of Cable |
Weight of Cable |
Max. DC Conductor Resistance at 20 °C | Capacitance | ||
| Cross-Sectional Area | Shape | Diameter | |||||||||
| mm² | mm | mm | mm | mm | mm | mm | mm | kg/m | Ω/km | μF/km | |
| 240 | Compact Round Stranded | 18.1 | 1.5 | 16.0 | 1.3 | 1.8 | 4.5 | 83 | 7.1 | 0.0754 | 0.16 |
| 300 | 20.4 | 1.5 | 16.0 | 1.3 | 1.8 | 4.5 | 86 | 7.9 | 0.0601 | 0.17 | |
| 400 | 23.2 | 1.5 | 16.0 | 1.3 | 1.9 | 4.5 | 89 | 8.9 | 0.0470 | 0.18 | |
| 500 | 26.3 | 1.5 | 16.0 | 1.3 | 2.0 | 4.5 | 92 | 10.2 | 0.0366 | 0.20 | |
| 630 | 30.2 | 1.5 | 16.0 | 1.3 | 2.1 | 4.5 | 97 | 11.9 | 0.0283 | 0.21 | |
| 800 | 34.0 | 1.5 | 16.0 | 1.3 | 2.2 | 4.5 | 101 | 14.0 | 0.0221 | 0.23 | |
| 1000 | Segment Stranded (Miliken) | 38.7 | 1.5 | 16.0 | 1.3 | 2.2 | 4.5 | 106 | 16.6 | 0.0176 | 0.25 |
| 1200 | 41.8 | 1.5 | 16.0 | 1.3 | 2.3 | 4.5 | 110 | 18.6 | 0.0151 | 0.27 | |
| 1600 | 48.1 | 1.5 | 16.0 | 1.3 | 2.4 | 4.5 | 116 | 22.9 | 0.0113 | 0.30 | |
| 2000 | 54.3 | 1.5 | 16.0 | 1.3 | 2.6 | 4.5 | 124 | 27.4 | 0.0090 | 0.32 | |
| 2500 | 63.0 | 1.5 | 16.0 | 1.3 | 2.8 | 4.5 | 131 | 34.3 | 0.0072 | 0.36 | |
| Continuous Current Ratings for Single Circuit (A) | ||||
|---|---|---|---|---|
| Cross-Sectional Area(mm2) | Direct Buried | Pipe Duct | In Air | |
| Trefoil | Flat(S=2D) | |||
| 240 | 530 | 495 | 612 | 679 |
| 300 | 600 | 559 | 702 | 781 |
| 400 | 684 | 636 | 808 | 904 |
| 500 | 780 | 727 | 934 | 1050 |
| 630 | 889 | 840 | 1077 | 1222 |
| 800 | 997 | 941 | 1222 | 1400 |
| 1000 | 1170 | 1100 | 1469 | 1681 |
| 1200 | 1264 | 1226 | 1599 | 1842 |
| 1600 | 1449 | 1404 | 1853 | 2168 |
| 2000 | 1600 | 1548 | 2064 | 2460 |
| 2500 | 1686 | 1631 | 2175 | 2592 |
| Conductor |
Thickness of Conductor Screen Approx. |
Thickness of Insulation |
Thickness of Insulation Screen Approx. | Thickness of Aluminum Sheath |
Thickness of Outer Sheath |
Outer Diameter of Cable |
Weight of Cable |
Max. DC Conductor Resistance at 20 °C | Capacitance | ||
| Cross-Sectional Area | Shape | Diameter | |||||||||
| mm² | mm | mm | mm | mm | mm | mm | mm | kg/m | Ω/km | μF/km | |
| 240 | Compact Round Stranded | 18.1 | 1.5 | 16.0 | 1.3 | 2.4 | 4.5 | 76 | 11.2 | 0.0754 | 0.16 |
| 300 | 20.4 | 1.5 | 16.0 | 1.3 | 2.5 | 4.5 | 78 | 12.3 | 0.0601 | 0.17 | |
| 400 | 23.2 | 1.5 | 16.0 | 1.3 | 2.6 | 4.5 | 81 | 13.8 | 0.0470 | 0.18 | |
| 500 | 26.3 | 1.5 | 16.0 | 1.3 | 2.7 | 4.5 | 85 | 15.6 | 0.0366 | 0.20 | |
| 630 | 30.2 | 1.5 | 16.0 | 1.3 | 2.7 | 4.5 | 88 | 17.5 | 0.0283 | 0.21 | |
| 800 | Segment Stranded (Miliken) | 34.0 | 1.5 | 16.0 | 1.3 | 2.9 | 4.5 | 93 | 20.4 | 0.0221 | 0.23 |
| 1000 | 38.7 | 1.5 | 16.0 | 1.3 | 3.0 | 4.5 | 98 | 23.6 | 0.0176 | 0.25 | |
| 1200 | 41.8 | 1.5 | 16.0 | 1.3 | 3.1 | 4.5 | 102 | 26.5 | 0.0151 | 0.27 | |
| 1600 | 48.1 | 1.5 | 16.0 | 1.3 | 3.3 | 4.5 | 108 | 31.7 | 0.0113 | 0.30 | |
| 2000 | 54.3 | 1.5 | 16.0 | 1.3 | 3.5 | 4.5 | 115 | 37.7 | 0.0090 | 0.32 | |
| 2500 | 63.0 | 1.5 | 16.0 | 1.3 | 3.7 | 4.5 | 123 | 44.3 | 0.0072 | 0.36 | |
| Continuous Current Ratings for Single Circuit (A) | ||||
|---|---|---|---|---|
| Cross-Sectional Area(mm2) | Direct Buried | Pipe Duct | In Air | |
| Trefoil | Flat(S=2D) | |||
| 240 | 530 | 495 | 612 | 679 |
| 300 | 600 | 559 | 702 | 781 |
| 400 | 684 | 636 | 808 | 904 |
| 500 | 780 | 727 | 934 | 1050 |
| 630 | 889 | 840 | 1077 | 1222 |
| 800 | 997 | 941 | 1222 | 1400 |
| 1000 | 1170 | 1100 | 1469 | 1681 |
| 1200 | 1264 | 1226 | 1599 | 1842 |
| 1600 | 1449 | 1404 | 1853 | 2168 |
| 2000 | 1600 | 1548 | 2064 | 2460 |
| 2500 | 1686 | 1631 | 2175 | 2592 |
| Conductor |
Thickness of Conductor Screen Approx. |
Thickness of Insulation |
Thickness of Insulation Screen Approx. | Thickness of Aluminum Sheath |
Thickness of Outer Sheath |
Outer Diameter of Cable |
Weight of Cable |
Max. DC Conductor Resistance at 20 °C | Capacitance | ||
| Cross-Sectional Area | Shape | Diameter | |||||||||
| mm² | mm | mm | mm | mm | mm | mm | mm | kg/m | Ω/km | μF/km | |
| 240 | Compact Round Stranded | 18.1 | 1.5 | 16.0 | 1.3 | 2.4 | 4.5 | 76 | 11.2 | 0.0754 | 0.16 |
| 300 | 20.4 | 1.5 | 16.0 | 1.3 | 2.5 | 4.5 | 78 | 12.3 | 0.0601 | 0.17 | |
| 400 | 23.2 | 1.5 | 16.0 | 1.3 | 2.6 | 4.5 | 81 | 13.8 | 0.0470 | 0.18 | |
| 500 | 26.3 | 1.5 | 16.0 | 1.3 | 2.7 | 4.5 | 85 | 15.6 | 0.0366 | 0.20 | |
| 630 | 30.2 | 1.5 | 16.0 | 1.3 | 2.7 | 4.5 | 88 | 17.5 | 0.0283 | 0.21 | |
| 800 | 34.0 | 1.5 | 16.0 | 1.3 | 2.9 | 4.5 | 93 | 20.4 | 0.0221 | 0.23 | |
| 1000 | Segment Stranded (Miliken) | 38.7 | 1.5 | 16.0 | 1.3 | 3.0 | 4.5 | 98 | 23.6 | 0.0176 | 0.25 |
| 1200 | 41.8 | 1.5 | 16.0 | 1.3 | 3.1 | 4.5 | 102 | 26.5 | 0.0151 | 0.27 | |
| 1600 | 48.1 | 1.5 | 16.0 | 1.3 | 3.3 | 4.5 | 108 | 31.7 | 0.0113 | 0.30 | |
| 2000 | 54.3 | 1.5 | 16.0 | 1.3 | 3.5 | 4.5 | 115 | 37.7 | 0.0090 | 0.32 | |
| 2500 | 63.0 | 1.5 | 16.0 | 1.3 | 3.7 | 4.5 | 123 | 44.3 | 0.0072 | 0.36 | |
| Continuous Current Ratings for Single Circuit (A) | ||||
|---|---|---|---|---|
| Cross-Sectional Area(mm2) | Direct Buried | Pipe Duct | In Air | |
| Trefoil | Flat(S=2D) | |||
| 300 | 584 | 558 | 669 | 740 |
| 400 | 664 | 634 | 768 | 855 |
| 500 | 754 | 718 | 879 | 988 |
| 630 | 853 | 811 | 1009 | 1146 |
| 800 | 953 | 938 | 1134 | 1307 |
| 1000 | 1100 | 1087 | 1328 | 1548 |
| 1200 | 1179 | 1163 | 1429 | 1684 |
| 1600 | 1331 | 1311 | 1627 | 1967 |
| 2000 | 1447 | 1485 | 1774 | 2199 |
| 2500 | 1523 | 1563 | 1868 | 2315 |
| Conductor |
Thickness of Conductor Screen Approx. |
Thickness of Insulation |
Thickness of Insulation Screen Approx. | Thickness of Aluminum Sheath |
Thickness of Outer Sheath |
Outer Diameter of Cable |
Weight of Cable |
Max. DC Conductor Resistance at 20 °C | Capacitance | ||
| Cross-Sectional Area | Shape | Diameter | |||||||||
| mm² | mm | mm | mm | mm | mm | mm | mm | kg/m | Ω/km | μF/km | |
| 300 | Compact Round Stranded | 20.4 | 1.5 | 17.0 | 1.3 | 1.9 | 4.5 | 87 | 8.4 | 0.0601 | 0.16 |
| 400 | 23.2 | 1.5 | 17.0 | 1.3 | 1.9 | 4.5 | 91 | 9.4 | 0.0470 | 0.18 | |
| 500 | 26.3 | 1.5 | 17.0 | 1.3 | 2.0 | 4.5 | 94 | 10.7 | 0.0366 | 0.19 | |
| 630 | 30.2 | 1.5 | 17.0 | 1.3 | 2.1 | 4.5 | 98 | 12.3 | 0.0283 | 0.21 | |
| 800 | 34.0 | 1.5 | 17.0 | 1.3 | 2.2 | 4.5 | 102 | 14.4 | 0.0221 | 0.22 | |
| 1000 | Segment Stranded (Miliken) | 38.7 | 1.5 | 17.0 | 1.3 | 2.3 | 4.5 | 108 | 17.0 | 0.0176 | 0.24 |
| 1200 | 41.8 | 1.5 | 17.0 | 1.3 | 2.3 | 4.5 | 111 | 19.0 | 0.0151 | 0.26 | |
| 1600 | 48.1 | 1.5 | 17.0 | 1.3 | 2.5 | 4.5 | 119 | 23.5 | 0.0113 | 0.28 | |
| 2000 | 54.3 | 1.5 | 17.0 | 1.3 | 2.6 | 4.5 | 125 | 28.0 | 0.0090 | 0.31 | |
| 2500 | 63.0 | 1.5 | 17.0 | 1.3 | 2.8 | 4.5 | 134 | 34.5 | 0.0072 | 0.34 | |
| Continuous Current Ratings for Single Circuit (A) | ||||
|---|---|---|---|---|
| Cross-Sectional Area(mm2) | Direct Buried | Pipe Duct | In Air | |
| Trefoil | Flat(S=2D) | |||
| 300 | 598 | 557 | 698 | 775 |
| 400 | 682 | 648 | 805 | 898 |
| 500 | 777 | 736 | 928 | 1042 |
| 630 | 886 | 836 | 1073 | 1214 |
| 800 | 996 | 939 | 1218 | 1391 |
| 1000 | 1168 | 1131 | 1464 | 1670 |
| 1200 | 1259 | 1221 | 1589 | 1825 |
| 1600 | 1445 | 1398 | 1845 | 2152 |
| 2000 | 1597 | 1541 | 2060 | 2445 |
| 2500 | 1681 | 1622 | 2169 | 2574 |
| Conductor |
Thickness of Conductor Screen Approx. |
Thickness of Insulation |
Thickness of Insulation Screen Approx. | Thickness of Aluminum Sheath |
Thickness of Outer Sheath |
Outer Diameter of Cable |
Weight of Cable |
Max. DC Conductor Resistance at 20 °C | Capacitance | ||
| Cross-Sectional Area | Shape | Diameter | |||||||||
| mm² | mm | mm | mm | mm | mm | mm | mm | kg/m | Ω/km | μF/km | |
| 300 | Compact Round Stranded | 20.4 | 1.5 | 17.0 | 1.3 | 2.5 | 4.5 | 80 | 12.5 | 0.0601 | 0.16 |
| 400 | 23.2 | 1.5 | 17.0 | 1.3 | 2.6 | 4.5 | 83 | 14.0 | 0.0470 | 0.18 | |
| 500 | 26.3 | 1.5 | 17.0 | 1.3 | 2.7 | 4.5 | 86 | 15.7 | 0.0366 | 0.19 | |
| 630 | 30.2 | 1.5 | 17.0 | 1.3 | 2.8 | 4.5 | 80 | 18.0 | 0.0283 | 0.21 | |
| 800 | 34.0 | 1.5 | 17.0 | 1.3 | 2.9 | 4.5 | 94 | 20.5 | 0.0221 | 0.22 | |
| 1000 | Segment Stranded (Miliken) | 38.7 | 1.5 | 17.0 | 1.3 | 3.0 | 4.5 | 100 | 23.8 | 0.0176 | 0.24 |
| 1200 | 41.8 | 1.5 | 17.0 | 1.3 | 3.2 | 4.5 | 103 | 26.7 | 0.0151 | 0.26 | |
| 1600 | 48.1 | 1.5 | 17.0 | 1.3 | 3.4 | 4.5 | 110 | 32.2 | 0.0113 | 0.28 | |
| 2000 | 54.3 | 1.5 | 17.0 | 1.3 | 3.6 | 4.5 | 116 | 37.9 | 0.0090 | 0.31 | |
| 2500 | 63.0 | 1.5 | 17.0 | 1.3 | 3.7 | 4.5 | 124 | 44.9 | 0.0072 | 0.34 | |
| Continuous Current Ratings for Single Circuit (A) | ||||
|---|---|---|---|---|
| Cross-Sectional Area(mm2) | Direct Buried | Pipe Duct | In Air | |
| Trefoil | Flat(S=2D) | |||
| 300 | 591 | 553 | 684 | 765 |
| 400 | 673 | 629 | 789 | 887 |
| 500 | 766 | 713 | 907 | 1027 |
| 630 | 871 | 829 | 1043 | 1193 |
| 800 | 977 | 928 | 1181 | 1367 |
| 1000 | 1143 | 1081 | 1415 | 1639 |
| 1200 | 1232 | 1208 | 1535 | 1790 |
| 1600 | 1404 | 1382 | 1765 | 2100 |
| 2000 | 1554 | 1523 | 1973 | 2384 |
| 2500 | 1636 | 1603 | 2077 | 2510 |
| Conductor |
Thickness of Conductor Screen Approx. |
Thickness of Insulation |
Thickness of Insulation Screen Approx. | Thickness of Aluminum Sheath |
Thickness of Outer Sheath |
Outer Diameter of Cable |
Weight of Cable |
Max. DC Conductor Resistance at 20 °C | Capacitance | ||
| Cross-Sectional Area | Shape | Diameter | |||||||||
| mm² | mm | mm | mm | mm | mm | mm | mm | kg/m | Ω/km | μF/km | |
| 300 | Compact Round Stranded | 20.4 | 1.5 | 17.0 | 1.3 | 1.5×80 | 4.5 | 72 | 6.3 | 0.0601 | 0.21 |
| 400 | 23.2 | 1.5 | 17.0 | 1.3 | 1.5×80 | 4.5 | 75 | 7.2 | 0.0470 | 0.23 | |
| 500 | 26.3 | 1.5 | 17.0 | 1.3 | 1.5×80 | 4.5 | 79 | 8.6 | 0.0366 | 0.25 | |
| 630 | 30.2 | 1.5 | 17.0 | 1.3 | 1.5×80 | 4.5 | 83 | 10.1 | 0.0283 | 0.28 | |
| 800 | 34.0 | 1.5 | 17.0 | 1.3 | 1.5×80 | 4.5 | 87 | 12.0 | 0.0221 | 0.30 | |
| 1000 | Segment Stranded (Miliken) | 38.7 | 1.5 | 17.0 | 1.3 | 1.5×80 | 4.5 | 92 | 14.4 | 0.0176 | 0.33 |
| 1200 | 41.8 | 1.5 | 17.0 | 1.3 | 1.5×80 | 4.5 | 98 | 16.7 | 0.0151 | 0.36 | |
| 1600 | 48.1 | 1.5 | 17.0 | 1.3 | 1.5×80 | 4.5 | 105 | 20.9 | 0.0113 | 0.40 | |
| 2000 | 54.3 | 1.5 | 17.0 | 1.3 | 1.5×80 | 4.5 | 112 | 25.4 | 0.0090 | 0.44 | |
| 2500 | 63.0 | 1.5 | 17.0 | 1.3 | 1.5×80 | 4.5 | 118 | 31.1 | 0.0072 | 0.34 | |
| Continuous Current Ratings for Single Circuit (A) | ||||
|---|---|---|---|---|
| Cross-Sectional Area(mm2) | Direct Buried | Pipe Duct | In Air | |
| Trefoil | Flat(S=2D) | |||
| 400 | 657 | 641 | 757 | 836 |
| 500 | 745 | 725 | 866 | 962 |
| 630 | 843 | 822 | 989 | 1111 |
| 800 | 943 | 916 | 1116 | 1268 |
| 1000 | 1090 | 1057 | 1310 | 1505 |
| 1200 | 1165 | 1131 | 1403 | 1631 |
| 1600 | 1316 | 1322 | 1596 | 1902 |
| 2000 | 1438 | 1440 | 1758 | 2143 |
| 2500 | 1512 | 1514 | 1849 | 2254 |
| Conductor |
Thickness of Conductor Screen Approx. |
Thickness of Insulation |
Thickness of Insulation Screen Approx. | Thickness of Aluminum Sheath |
Thickness of Outer Sheath |
Outer Diameter of Cable |
Weight of Cable |
Max. DC Conductor Resistance at 20 °C | Capacitance | ||
| Cross-Sectional Area | Shape | Diameter | |||||||||
| mm² | mm | mm | mm | mm | mm | mm | mm | kg/m | Ω/km | μF/km | |
| 400 | Compact Round Stranded | 23.2 | 1.5 | 23.0 | 1.3 | 2.2 | 4.5 | 104 | 11.0 | 0.0470 | 0.14 |
| 500 | 26.3 | 1.5 | 23.0 | 1.3 | 2.3 | 4.5 | 108 | 12.1 | 0.0366 | 0.15 | |
| 630 | 30.2 | 1.5 | 23.0 | 1.3 | 2.4 | 4.5 | 112 | 14.2 | 0.0283 | 0.17 | |
| 800 | 34.0 | 1.5 | 23.0 | 1.3 | 2.4 | 4.5 | 116 | 15.8 | 0.0221 | 0.18 | |
| 1000 | 38.7 | 1.5 | 23.0 | 1.3 | 2.4 | 4.5 | 116 | 15.8 | 0.0221 | 0.18 | |
| 1200 | Segment Stranded (Miliken) | 41.8 | 1.5 | 23.0 | 1.3 | 2.6 | 5.0 | 126 | 21.5 | 0.0151 | 0.21 |
| 1600 | 48.1 | 1.5 | 23.0 | 1.3 | 2.7 | 5.0 | 133 | 26.0 | 0.0113 | 0.23 | |
| 2000 | 54.3 | 1.5 | 23.0 | 1.3 | 2.8 | 5.0 | 139 | 30.7 | 0.0090 | 0.24 | |
| 2500 | 63.0 | 1.5 | 23.0 | 1.3 | 3.0 | 5.0 | 148 | 37.8 | 0.0072 | 0.27 | |
| Continuous Current Ratings for Single Circuit (A) | ||||
|---|---|---|---|---|
| Cross-Sectional Area(mm2) | Direct Buried | Pipe Duct | In Air | |
| Trefoil | Flat(S=2D) | |||
| 400 | 676 | 638 | 793 | 871 |
| 500 | 770 | 745 | 914 | 1010 |
| 630 | 876 | 847 | 1054 | 1173 |
| 800 | 986 | 950 | 1196 | 1343 |
| 1000 | 1153 | 1108 | 1429 | 1606 |
| 1200 | 1243 | 1194 | 1552 | 1757 |
| 1600 | 1424 | 1401 | 1797 | 2068 |
| 2000 | 1571 | 1545 | 2004 | 2342 |
| 2500 | 1652 | 1625 | 2108 | 2463 |
| Conductor |
Thickness of Conductor Screen Approx. |
Thickness of Insulation |
Thickness of Insulation Screen Approx. | Thickness of Aluminum Sheath |
Thickness of Outer Sheath |
Outer Diameter of Cable |
Weight of Cable |
Max. DC Conductor Resistance at 20 °C | Capacitance | ||
| Cross-Sectional Area | Shape | Diameter | |||||||||
| mm² | mm | mm | mm | mm | mm | mm | mm | kg/m | Ω/km | μF/km | |
| 400 | Compact Round Stranded | 23.2 | 1.5 | 23.0 | 1.3 | 3.2 | 4.5 | 96 | 17.9 | 0.0470 | 0.14 |
| 500 | 26.3 | 1.5 | 23.0 | 1.3 | 3.3 | 4.5 | 100 | 19.7 | 0.0366 | 0.15 | |
| 630 | 30.2 | 1.5 | 23.0 | 1.3 | 3.4 | 4.5 | 104 | 22.1 | 0.0283 | 0.17 | |
| 800 | 34.0 | 1.5 | 23.0 | 1.3 | 3.5 | 4.5 | 108 | 24.8 | 0.0221 | 0.18 | |
| 1000 | Segment Stranded (Miliken) | 38.7 | 1.5 | 23.0 | 1.3 | 3.6 | 5.0 | 114 | 28.8 | 0.0176 | 0.20 |
| 1200 | 41.8 | 1.5 | 23.0 | 1.3 | 3.9 | 5.0 | 118 | 32.3 | 0.0151 | 0.21 | |
| 1600 | 48.1 | 1.5 | 23.0 | 1.3 | 4.1 | 5.0 | 124 | 38.2 | 0.0113 | 0.23 | |
| 2000 | 54.3 | 1.5 | 23.0 | 1.3 | 4.2 | 5.0 | 130 | 43.8 | 0.0090 | 0.24 | |
| 2500 | 63.0 | 1.5 | 23.0 | 1.3 | 4.4 | 5.0 | 148 | 52.5 | 0.0072 | 0.27 | |
| Continuous Current Ratings for Single Circuit (A) | ||||
|---|---|---|---|---|
| Cross-Sectional Area(mm2) | Direct Buried | Pipe Duct | In Air | |
| Trefoil | Flat(S=2D) | |||
| 400 | 668 | 634 | 779 | 863 |
| 500 | 759 | 719 | 895 | 998 |
| 630 | 864 | 842 | 1031 | 1159 |
| 800 | 970 | 944 | 1167 | 1326 |
| 1000 | 1131 | 1100 | 1390 | 1583 |
| 1200 | 1221 | 1185 | 1512 | 1733 |
| 1600 | 1397 | 1354 | 1750 | 2040 |
| 2000 | 1543 | 1489 | 1950 | 2309 |
| 2500 | 1623 | 1566 | 2051 | 2429 |
| Conductor |
Thickness of Conductor Screen Approx. |
Thickness of Insulation |
Thickness of Insulation Screen Approx. | Thickness of Aluminum Sheath |
Thickness of Outer Sheath |
Outer Diameter of Cable |
Weight of Cable |
Max. DC Conductor Resistance at 20 °C | Capacitance | ||
| Cross-Sectional Area | Shape | Diameter | |||||||||
| mm² | mm | mm | mm | mm | mm | mm | mm | kg/m | Ω/km | μF/km | |
| 400 | Compact Round Stranded | 23.2 | 1.5 | 23.0 | 1.3 | 1.5×80 | 4.5 | 91 | 10.0 | 0.0470 | 0.14 |
| 500 | 26.3 | 1.5 | 23.0 | 1.3 | 1.5×80 | 4.5 | 94 | 11.2 | 0.0366 | 0.15 | |
| 630 | 30.2 | 1.5 | 23.0 | 1.3 | 1.5×80 | 4.5 | 98 | 12.8 | 0.0283 | 0.17 | |
| 800 | 34.0 | 1.5 | 23.0 | 1.3 | 1.5×80 | 4.5 | 102 | 14.8 | 0.0221 | 0.18 | |
| 1000 | Segment Stranded (Miliken) | 38.7 | 1.5 | 23.0 | 1.3 | 1.5×80 | 5.0 | 107 | 17.2 | 0.0176 | 0.20 |
| 1200 | 41.8 | 1.5 | 23.0 | 1.3 | 1.5×80 | 5.0 | 110 | 19.2 | 0.0151 | 0.21 | |
| 1600 | 48.1 | 1.5 | 23.0 | 1.3 | 1.5×80 | 5.0 | 116 | 23.3 | 0.0113 | 0.23 | |
| 2000 | 54.3 | 1.5 | 23.0 | 1.3 | 1.5×80 | 5.0 | 123 | 27.6 | 0.0090 | 0.24 | |
| 2500 | 63.0 | 1.5 | 23.0 | 1.3 | 1.5×80 | 5.0 | 132 | 33.9 | 0.0072 | 0.27 | |
Quality Control
High Voltage Power Cable
Raw Material Test
NPC has always chosen raw material suppliers who have a good reputation, possess stable supply capabilities and have passed international quality system certifications (such as ISO 9001). And establish a long-term cooperative relationship with it, forming a stable and reliable raw material supply chain.
We will ensure that all raw materials are subject to strict inspection procedures upon entry to the factory, and can only be stored in the warehouse after they have been confirmed to meet the standards.
Process inspection
NPC has strict quality control procedures for each process in the cable production process.
Process documents: Develop detailed process flow and operation instructions to clarify the operating specifications and quality standards of each process.
Equipment calibration: Regularly calibrate key equipment such as wire drawing machines, stranding machines, extruders, and diameter gauges to ensure that the accuracy meets the requirements.
First piece confirmation: Before each batch of production, the first piece is trial-produced to confirm that the process parameters, product dimensions, electrical performance, etc. meet the standards before mass production can be carried out.
Finished Product
Inspectors conduct ex-factory inspections on cables according to relevant standards and corresponding product inspection specifications to ensure that each ex-factory product complies with the process regulations.
Application
High Voltage Power Cable is used for the transmission and distribution of electric power and is suitable for installation in ducts, trenches or direct buried underground or within buildings. These cables are ideal for use to connect wind farms and other renewable energy to existing grid systems.
Technical Advantages
● 30+ years of manufacturing experience
● ISO and UL certified production
● Customized cable and transformer solutions
Product Packaging
Wires and Cables packaging (1)
Wires and Cables packaging (2)
Wires and Cables packaging (3)
Wires and Cables packaging (4)
Wires and Cables packaging (5)
Wires and Cables packaging (6)
Wires and Cables packaging (7)
Wires and Cables packaging (8)
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FAQ From Customers
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What are the advantages of power cables and overhead lines?(1) Reliable operation, because it is installed in a hidden place such as underground, it is less damaged by external forces, has less chance of failure, and the power supply is safe, and it will not cause harm to people; (2) The maintenance workload is small and frequent inspections are not required; (3) No need to erect towers; (4) Help improve power factor.
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Which aspects should be considered when choosing the cross section of a power cable?(1) The long-term allowable working current of the cable; (2) Thermal stability once short circuited; (3) The voltage drop on the line cannot exceed the allowable working range.
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What are the measures for cable fire prevention?(1) Use flame-retardant cables; (2) Use fireproof cable tray; (3) Use fireproof paint; (4) Fire partition walls and fire baffles are installed at cable tunnels, mezzanine exits, etc.; (5) Overhead cables should avoid oil pipelines and explosion-proof doors, otherwise local pipes or heat insulation and fire prevention measures should be taken.
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What should be paid attention to during the transportation and handling of cables?(1) During transportation, loading and unloading, cables and cable reels should not be damaged. It is strictly forbidden to push the cable reels directly from the vehicle. Generally, cables should not be transported and stored flat. (2) Before transporting or rolling the cable reel, ensure that the cable reel is firm, the cable is wound tightly, the oil pipe between the oil-filled cable and the pressure oil tank should be fixed without damage, the pressure oil tank should be firm, and the pressure indication should meet the requirements.
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What inspections should be carried out for the acceptance of cable lines?(1) The cable specifications should meet the regulations, the arrangement should be neat, no damage, and the signs should be complete, correct and clear; (2) The fixed bending radius of the cable, the related distance and the wiring of the metal sheath of the single-core power cable should meet the requirements; (3) The cable terminal and the middle head should not leak oil, and the installation should be firm. The oil pressure of the oil-filled cable and the meter setting should meet the requirements; (4) Good grounding; (5) The color of the cable terminal is correct, and the metal parts such as the bracket are completely painted; (6) There should be no debris in the cable trench, tunnel, and bridge, and the cover should be complete.
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