66-220kV XLPE Insulated Cable from China

 

 

 

YJLW02（YJLLW02�? Cu. (Al.) conductor, XLPE insulated, corrugated aluminum sheath and PVC outer-sheath power cable.

YJLW03（YJLLW03�? Cu. (Al.) conductor, XLPE insulation, corrugated aluminum sheath and PE outer-sheath power cable. 

YJLW02-Z（YJLLW02-Z�? Cu. (Al.) conductor, XLPE insulation, corrugated aluminum sheath, PVC outer-sheath and longitudinal waterproof power cable. 

YJLW03-Z（YJLLW03-Z�? Cu. (Al.) conductor, XLPE insulation, corrugated aluminum sheath, PE outer-sheath and longitudinal waterproof power cable.

 

Application Circumstances:

PVC outer-sheath cable is mainly used in cable line which is anti-fire and has insulation requirements. PE outer-sheath cable is mainly used in directly buried cable line which has high requirement about the o outer-sheath insulation. For low temperature ambience (lower than -20�?, chemical liquid circumstances or poison cable, we should adopt PE outer-sheath

Structure:

1.                         Conductor (800mm² and below: compacted and circular, 800mm² and above: Milliken)

2.                         Conductor Shield

3.                         XLPE Insulation

4.                         Insulation Shield

5.                         Longitudinal Waterproof Cushion Layer

6.                         Corrugated Aluminum Sheath

7.                         Corrosion-resistant Layer

8.                         PE (PVC) Sheath and semi-conductive Coating

Product and Technique:

1.      Rod

Copper rod with diameter of 8mm is made of #1 copper plate with oxygen contents less than 18ppm and conductivity more than 101�?IACS.

Aluminum rod is made of aluminum ingot for electric purpose. After rare-earth elements treating specially, rod with diameter of 9.5 mm will have better electric and physical performance.

Copper rod is manufactured on upward oxygen-free copper rod production line.

Aluminum rod is manufactured on continuous rolling and casting sets.

2.  Conductor

Conductor is stranded from copper or aluminum wires. Conductor including and below 630mm² is compacted circular stranded by draw dies with good concentricity and high compaction coefficient. Conductor above 800mm² is segmented so as to reduce skin effects and low AC resistance and improve cable transmission capacity.

 Compacted and circular conductor, sector shape segments for segmental conductor are manufactured on Frame Stranding Machine imported from CEECO in Canada which is completely controlled by computer. Sector segmental block can be twisted into helical shape with certain lay in order to finish stranding freely.

Sector segmental blocks can be stranded into circular shape with steady structure on Drum Stranding Machine.

Among the wires of conductor, water-absorption swelling material can be applied for conductor longitudinal waterproof.

3.      Insulation and Screen

Insulation is a super clean cross-linking material. Inner and outer screens are made from super clean, super-smooth, semi-conductive XLPE compound. Insulation, inner and outer screens are adopted by simultaneous triple-extrusion on vertical VCV line.

VCV line imported from NOKIA, Finland is completely controlled by computers with 96 meters height of vertical tower.

Insulation and screen material are fed by self-gravity under the circumstance of extra clean class reaching 1000.

Crosshead for bonded triple extrusion ensures smoothness of interfaces between screens and insulation.

Conductor preheater can drive the moisture out of conductor and ensure the uniformity of curing.

EX-RAY8000 eccentricity gage can facilitate to adjust concentricity and thickness of insulation and screens.

Curing and cooling adopt full dry process.

In-line stress elimination can relieve stress remainder in the cable core for improving the electrical and physical performance of cables and avoiding damages to cable terminations and joints.

4.      Semi-conductive Waterproof Cushion Layer

Imported top-quality semi-conductive waterproof swelling tapes are wrapped on insulated core as longitudinal waterproof cushion layer.

Suitable wrapping method results in completely effective and excellent longitudinal waterproof along cable screen.

5.      Metallic Sheath

Corrugated aluminum sheath not only satisfies the short circuit capacity, but also has an excellent strength, low weight, bending easily and good waterproof performance.

6.outer-sheath

outer-sheath is extruded with PE or PVC compound, also anti-termite compound as per the customer’s requirements. Semi-conductive coating is applied as an electrode of outer-sheath for withstand voltage test.