220kV XLPE insulated water resistant cable
Maximum conductor temperature: under normal (90℃), emergency (130℃) or short-circuit conditions not exceeding 5 s (250℃).
Minimum ambient temperature: If the ambient temperature is lower than 0℃, the cable should be preheated
Minimum bending radius: 20 (d + D) ± 5%
1.1 Compact circular conductor, composed of several layers of concentric spiral windings.
1.2 Segmented conductors. The conductors consist of multiple segmented conductors assembled together to form a cylindrical core.
2. The semiconductor shielding layer on the conductor:
In order to prevent electric field concentration, there is an ultra-smooth semiconductor XLPE interface between the conductor and the insulating layer.
3. XLPE insulation:
When working under high voltage, the insulating layer insulates the shielding layer from the shielding layer operating at ground potential. The insulating material must be able to withstand the electric field under rated and transient operating conditions.
4. Semiconductor shielding layer on the insulating layer:
This layer has the same function as the conductor shield: it gradually transitions from an insulating medium with a non-zero electric field to a conductive medium with a zero electric field (here, the metal cable shield).
5. Metal screen:
Longitudinal welded corrugated aluminum screen
PVC (IEC60502 ST 2) PE (IEC60502 ST 7)
7. Core recognition:
8. Cable marking:
Embossing or printing
IEC 60840 IEC 62067 GB / T 11017 GB / T 18890
It is used for the transmission line between the two units of the distribution network, the generator unit and the distribution unit, or the transmission station or substation.
Air transport or direct burial
Physical and Electrical Characteristics
|No.cores x||Insulation||Sheath||Outer Ø||weight||Current ratings in air 30℃||Current ratings buried 20℃|
|mm²||mm||mm||mm||mm||kg / km||A||A|
XLPE power cable insulation is made of XLPE (cross-linked polyethylene) rated at 90 o C.
Conductor: flat round, compacted stranded aluminum wire or high-purity copper in accordance with IEC 60228 level 2.
Outer sheath: PVC or LSOH-low smoke and halogen free
Rated voltage: medium and low voltage
Executive standard: manufactured according to GB/T12706-2002 standard (same as IEC60502).
Armor: galvanized steel wire or steel tape.
Conductor: Annealed copper or tinned copper-
Round solid copper wire IEC 60228 Class 1 (RE)-
Round stranded copper wire IEC 60228 Class 2 (RM)
-Sector-shaped twisted copper wire IEC 60228 Class 2 (SM)-
Round flexible copper wire IEC 60228 level 5
Conductor shielding layer: semi-conductive tape or semi-conductive extrusion
Insulation layer: XLPE
Insulation shielding layer: semi-conductive tape or semi-conductive extrusion or/and copper tape
Inner cover: filler and tape wrapped or extruded
Metal armor: galvanized steel tape (STA) or galvanized steel wire (SWA)
Sheath: PVC or PE