3.8/6.6(7.2)kV XLPE Insulated Single Core and 3Cores Power Cable (AS/NZS 1429.1)

Application

To be used for power distribution in medium voltage, as transformer feeders in substations. In power plants, industrial and operation installations, in residential areas and mining installations, in dry or wet locations, fixed installed in air, directly buried in the ground or in ducts, where require higher mechanical protection.

Characteristics

Electrical Characteristics:
Rated voltage: 3.8/6.6(7.2) kV
AC High voltage test: 12.5kV for 5min
Partial Discharge at 2 U₀: ≤20PC or 1.5U₀: ≤5PC

Temperature characteristics:
Conductor operating temperature: -15℃~90℃
Min. temperatrue laying condition: 0℃
Conductor emergency operating temperature: 105℃
Conductor short-circuit operating temperature (5s): 250℃

Color:
Core identification: Nature or Red、White、Blue color tape for three cores
Outer sheath: Black or according to customer requirements

Cross Section：
1 core; 25~1000mm2
3 core; 25~400mm2

Construction

Construction:

1. Conductor – Plain annealed class 2 compacted copper
2. Conductor screen – Semi-conductive compound
3. Insulation – Cross linked polyethylene (XLPE)
4. Insulation screen – Semi-conductive compound
5. Metallic screen – Plain annealed copper wire
6. PP rope filler
7. Binder tape – Non-hygroscopic material tape
8. Separation layer – Polyvinyl chloride compound (PVC 5V-90)
9. Armor – Hard drawn aluminum wires for single core or Galvanized steel wire for multi core
10. Binder tape – Non-hygroscopic material tape
11. Outer sheath – Polyvinyl chloride compound (PVC 5V-90)

Option for  anti-termite : Nylon / PA12: Polyamide 12 anti-termite sheath

 NOTE :The anti-termite nylon (PA12) sheath is an enhanced engineering structure, not a mandatory standard configuration.

Cable Drawing :

Applicable Standards

Optional

Technical Parameters

Dimensions

Single Core

Three Cores

Current Ratings
The continous current rating given in this catalogue according to AS/NZS 3008.1.1:2009-“Electrical installations–selection of cables/part 1.1: Cables for alternating voltages up to and including 0.6/1 KV- Typical apply to Australian installation conditions.
Maximum conductor temperature: 90°C
Ambient air temperature: 40°C
Ambient soil temperature: 25°C
Depth of laying (Buried Direct & Wring Enclosure): 0.8m
Thermal resistivity of the soil : 1.2℃.m/W
Note: Single core cables are laid in the configurations indicated in the current rating tables and the screens are bonded to the earth at both ends.

Rating factors
For different installation conditions of cable to select suitable current rating capicity. The rating correction factors given in the following tables should be applied.

VARIANCE: AIR AMBIENT TEMPERATURES

VARIANCE: GROUND TEMPERATURE

VARIANCE:DEPTH OF BURIAL

VARIANCE:THERMAL RESISTIVITY OF SOIL

Emergency Rating
XLPE insulated cables can operate under emergency conditions with a conductor temperature of 130℃ for periods of up to 36 hours, not more than three times per year.

In practice, however, due to the difficulty in ensuring compatibility with terminations and the high volume expansion of XLPE above 100℃, a limit of 105℃ for emergency rating has become widely accepted and is specified in AS/NZS 1429, IEC, Japanese and European specifications.

A further restriction is evident where metal tape screens are specified; here the overload temperature may have to be limited to 100℃.

The 105℃ emergency limit represents the following approximate percentage increase over the normal continuous ratings:
Cables in air: +14%
Cables in ground (laid direct or in ducts): +11%

FAQ