Application and description

Three core cable design distribution range is 3.8/6.6KV to 19/33KV, the frequency is 50Hz. Mainly used in power supply station, indoor plumbing, outdoor, ground and water, such as a variety of places, industry, distribution station, power station cable installation.

 

Standard:

IEC 60502 Part 1 (1.8/3KV) IEC 60502 Part 2 (3.6/6KV to 18/30KV)

 

Structure:

 

conductor

Plain annealed copper or aluminum conductor, with IEC 60228 (1 and 2).

 

Conductor shield

The conductor shield shall be non metallic, and shall include an extruded semi conductive compound, and the semiconductor band is applied to the top of the semiconductor compound. The conductor shielding layer is applied to the three heavy extrusion process of the outer conductor and the insulating shield. The conductor shield layer is made of a non metal layer, and the extruded semi conductive compound must be firmly affixed to the insulation in order to eliminate all gaps. For PVC in the 1.8/3KV to 3.6/6KV range, the conductor shield layer is not necessary for EPR/HEPR insulated cables.

 

insulation

1.8/3KV and 3.6/6KV cable range is generally used PVC insulation, but also can use EPR/HEPR, XLPE insulation.

 

Insulation shielding

The extruded semi conductive crosslinked composite layer is applied in the insulating layer. The semiconductor extrusion layer shall include bonding, or may be stripped of the semiconductor compound layer, to be welded or terminated. As an option, 1.5 conductive tapes can be applied to the extruded semi conductive metal layer as a cushion layer. A minimum thickness of 0.3 mm, the maximum of 500 ohm resistivity, in the 90 C of the meter shield is tightly mounted on the insulation to exclude all air voids and can easily be peeled off at the spot. Insulation shielding layer for the 1.8/3KV to 3.6/6KV range of PVC, EPR/HEPR insulation of the cable is not necessary. The shielding layer can be coated on the periphery of the semiconductor waterproof layer to make the longitudinal waterproof layer.

 

Inner covering and packing

For composite metal wire cable or each single core has a metal layer of the cable, the inner layer of the semiconductor and filling should be covered in the core wire peripheral. The inner layer is made of waterproof material, and the inner layer is made of waterproof material. The inner layer is covered with a layer of extrusion, but can overlap if the gap between the core and the core is filled.

 

Metal layer

The metal layer can be applied to single core and can also be applied in the multi core periphery.

1) metal shield

2) concentric conductor

3) metal sheath

4) metal armor

Combination of the metal shielding layer includes copper or copper wire or copper wire and concentric copper strip. The metal layer provides a grounding fault current path, and the concentric conductor can be covered by an insulating layer, and the insulating layer is covered with a shielding cover or an inner sheath layer. The metal sheath is generally a seamless tube of lead or lead alloy.Metal armor can be flat round armored and filamentous filamentous armour, with armour.

 

The separation sheath (armored cable)

The separation sleeve comprises extrusion layer, the extrusion layer material is PVC, PE or LSZH, and the thickness of the extruded layer is generally 0.02Du 0.6mm, and the Du is a diameter calculated according to the technical parameters of the sheath and the like. The general separation jacket thickness is greater than 1.2mm. The separating jacket is generally used in the outer layer of the lead sheath, and the thickness of the ordinary separate jacket is less than 1.0mm.

 

Wrapping layer (lead sheath cable)

Wrapping layer generally by tape impregnated / synthetic composition, can also is two layers of composite, the band by a special composite materials with composition. Thickness is generally around 1.5mm.

 

The armored layer (for armored cable)

General for round steel wire armored armored layer, outer sheath in separate application. For flat wire armoured and greater than 15mm in fictitious diameter armoured cable, ordinary flat sheath thickness is 0.8mm, fictitious diameter cable armoring layer up to 15 mm, including 15mm. Tape armour is two layers of spiral shape, the outer armor generally within layer as the axis, and tape armored cable is needed and reinforcing layer pad.

 

Outer sheath

The outer sheath comprises an extruded layer and an extruded thermoplastic compound (ST3 PVC type or ST7 PE type), or an elastic compound (polyvinyl chloride or CSP). The usual outer sheath thickness is D, 0.035 D indicates the diameter of the outer sheath, and the unit is mm. Non armoured cable and unarmored aggregate sheath cable, metal shielding layer or a concentric conductor and outer sheath thickness should be less than 1.4mm, concentric conductor total metal sheath sheathed cable outer sheath thickness should be greater than 1.8 mm.

Cable structure parameters: