Single Core Underground High Voltage Electrical Cable With Copper Or Aluminum Conductor

Parameter category

Parameter item

parameter values

configuration parameter

electric conductor

Material: copper core (cross-section range: 630~1600mm²)

External diameter of conductor

30.0~56.5mm (The larger the section, the increasing the outer diameter)

insulating course

Material: Cross-linked polyethylene (XLPE), thickness of 16.5±0.5mm

Conductor shielding layer

Thickness of 1.2mm (semi-conductive material)

insulation screen

Thickness of 1.0mm (semi-conductive material)

metallic sheath

Wrinkle aluminum sheath (2.0±0.2mm) (double galvanized steel strip, 0.5~0.8mm)

oversheath

Material: flame retardant polyvinyl chloride (PVC) or polyethylene (PE), thickness of 4.5±0.2mm

Electrical parameters

20℃ conductor DC resistance

0.0754~0.009 Ω / km (the larger the section, the lower the resistance)

90℃ conductor AC resistance

0.097~0.0142Ω/km

capacity value

134-282 p F/m (increased with increasing cross-section)

Power frequency pressure test

64 / 110kV (factory test)

Local discharge performance

At 5pC(1.5U₀ under-voltage)

Mechanical and laying parameters

minimum bending radius

12 x cable outer diameter (armor layer requirement)

Allow working temperature

Long-term: 90℃, short circuit (within 5 seconds): 250℃

Laying ambient temperature

≥0℃

Vehicle flow reference

Flow rate in single return air

Section 630mm²: 1010A; section 1600mm²: 1690A (ambient temperature 40℃, soil thermal resistance 1.0m · ℃ / W)

Load flow rate of directly buried laying

Section 630mm²: about 800A; section 1600mm²: about 1300A (buried depth 1m, ground temperature 35℃)