New Product Best quality HV cable
CU/XLPE/CWS/LAT/HDPE 76/132kV 64/110kV 38/66kV XLPE Insulated power cable
CU/XLPE/CAS/PVC 76/132kV 64/110kV 38/66kV XLPE Insulated Underground Power Cable
1. The products are mainly complying with IEC 60840 standard, also can be produced according to OEM requirements and other standards, such as bs standard, DIN standard, ASTM standard, etc.Voltage grade is up to 220kv, cross-section area can be up to 2500 sqmm (copper or aluminiun conductor). Conductor long-time operating temperature is 90 degrees. In short circuit, conductor highest temperature should be not more than 250 degrees.
2. Brief Construction:
Number of core:Single core
Conductor:Copper or aluminium conductor
Conductor Screen:Super clear semi-conductive
Insulation: Super clear XLPE insulation
Insulation screen:Super clear semi-conductive
Water Blocking:Semi-conductive Water blocking Swelling tape
Metal layer:Corugation aluminum sheath or Copper wire screen
Sheath:PVC or HDPE sheath
Outer conductive layer:Graphite
3. Laying conditions: For lyaing under ground with large different altitude, be able to bear external machanical force and moderate pulling force
4. MANUFACTURING FEATURES
The conductor shall be round compact stranded copper wires. The resistance of each conductor at
20ºC shall be in accordance with IEC 60228 standard. The surface of the conductor shall be clean
and free from any foreign particles, which may contaminate the insulation or cause high electrical
field stress in the conductor screen.
Conductor screen, Insulation and Insulation screen
Extrusion of conductor screen, insulation and insulation screen shall be by single pass, triple
extrusion method. Conductor screen, XLPE main insulation and insulation screen shall be produced
by triple extrusion and dry curing.
Conductor screen shall consist of semi-conducting tapes applied over the conductor and a
continuous layer of extruded semiconducting XLPE compound covering the entire surface area of the
conductor and firmly bonded to the inner surface of the insulation.
The insulation shall be XLPE and shall be applied by extrusion and cross-linked to form a compact
and homogeneous layer in accordance with the Standards specified. The insulation material shall be
of Super Clean polyethylene mixture suitable for cross-linking (XLPE).
Insulation screen shall consist of a layer of extruded non-strippable semi-conducting thermosetting
compound.
After triple extrusion, the insulated cores shall be degassed to remove the by-product in the core from
the cross-linking process.
Bedding
Semi-conducting water-blocking tapes (swellable tapes) over the insulation screen shall be applied to
prevent longitudinal water penetration between insulation screening and metallic sheath. The
swellable tape(s) shall cover the entire surface area of the insulation screen.
Metallic screen
Plain copper wires and a layer of counter helix metallic copper tape shall be applied over the
semi-conducting water blocking tape to accommodate the required fault current.
Metallic sheath
A layer of AL-plastic composite tape shall be applied over the semi-conducting water blocking tape to
accommodate the required radical water tightness.
Outer sheath
The outer-sheath shall be of an extruded layer of black color High Density Polyethylene (HDPE).It
shall be highly chemical resistance and withstand the mechanical force during fabrication, transit,
installation and operation.
Outer conductive layer
A coating of Graphite shall be applied over the over sheath to carry out D.C. Voltage Test.
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