High Voltage Cables

High Voltage Cables

40/69kV XLPE Insulated, PE Sheathed High Voltage Power Cables

Application

These single core cables are designed for installation mostly in power supply stations, indoors and in cable ducts, outdoors, underground and in water as well as for installation on cable trays for industries, switchboards and power stations. If the cable gets water inside due to the mechanical demages, swellable tapes prevent the movement of the water inside the cable.

Standard

IEC 60840

Construction

40/69kV XLPE Insulated, PE Sheathed High Voltage Power Cables

Conductor Aluminium wire, stranded to BS 6360 class 2.
Conductor Screen The conductor screen consists of an extruded layer of non metallic, semi-conducting compound applied on top of a semi-conducting tape. The conductor screen is applied under triple extrusion process over the conductor along with the insulation and the insulation screen. The extruded semi-conducting compound is firmly bonded to the insulation to exclude all air voids and can be easily hand stripped on site.
Insulation Extruded cross-linked polyethylene (XLPE-GP8) compound insulation.
Insulaton Screen The insulation screen consists of an extruded layer of non metallic, semi-conducting compound extruded over the insulation of each core. The extruded semi-conducting layer shall consist of bonded or cold strippable semi-conducting compound capable of removal for jointing or terminating.
Semi-conductive Water Blocking Swellable Tape A semi-conducting tape shall be applied over the core assembly as a bedding for the metallic layer. The minimum thickness is 0.3 mm and the maximum resistivity is 500 Ohm-m at 90°C. The screen is tightly fitted to the insulation to exclude all air voids and can be easily hand stripped on site. The screen may be covered by semi-conductive water blocking swellable tape to ensure longitudinal watertightness.
Metallic Layer The metallic layer may be applied over the core assembly collectively. The metallic screen shall consist of either copper tapes or a concentric layer of copper wires or a combination of tapes and wires.
Swellable Tape Swellable material
Separation Sheath Aluminum Tape sheath
Outer Sheath Thermoplastic HDPE-ST3 compound

Dimensional Data

Nom. Cross-Section Area Nom. Insulation Thickness Metallic Screen Area Approx. Overall Diameter Approx. Weight
CU AL
mm² mm mm² mm kg/m
240 11.0 35 56.9 4.3 2.9
300 11.0 50 59.9 5.1 3.3
400 11.0 50 61.5 6.0 3.8
500 11.0 50 63.0 7.0 4.1
630 11.0 50 67.0 8.5 4.6
800 11.0 50 71.0 10.3 5.4
1000 11.0 50 77.0 12.6 6.3
1200 11.0 70 83.0 14.7 7.6

 

Electrical Data

 

Nom. Cross- Section Area D C
Resistance @20°C
A C
Resistance @90°C
Capacitance per core Inductance Continuous Current Rating for Single Circuit
Cu conductor Al conductor
Cu Al Cu Al Direct
Buried
In Air Direct
Buried
In Air
Trefoil   Flat Trefoil   Flat
mm² Ω/km Ω/km Ω/km Ω/km µF/km mH/km A A
240 0.0754 0.125 0.0970 0.1608 0.174 0.414 545 576 715 424 449 557
300 0.0601 0.100 0.0777 0.1289 0.189 0.397 617 658 820 481 515 642
400 0.0470 0.0778 0.0613 0.1006 0.207 0.381 706 762 955 554 601 752
500 0.0366 0.0605 0.0485 0.0787 0.242 0.360 805 877 1108 635 697 878
630 0.0283 0.0469 0.0384 0.0616 0.267 0.446 920 1012 1292 728 807 1023
800 0.0221 0.0367 0.0311 0.0489 0.291 0.334 1039 1049 1483 830 931 1189
1000 0.0176 0.0291 0.0232 0.0378 0.329 0.323 1157 1292 1688 937 1060 1364
1200 0.0151 0.0247 0.0201 0.0322 0.363 0.315 1333 1542 1974 1054 1226 1558