38/66kV 64/110kV 76/132kV 87/150kV 127/220kV XLPE Insulated
Underground Power Cable
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:Single core Copper or aluminium conductor
XLPE insulationCorugation aluminum sheathPVC or PE sheath3. Laying conditions: For lyaing under ground with large different
altitude, be able to bear external machanical force and moderate
pulling force4. MANUFACTURING FEATURES
ConductorThe conductor shall be round compact stranded copper or aluminum
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 shall cover the entire surface area of the
insulation screen.
Metallic sheath
Corrugation Aluminum sheath shall be applied over the
semi-conducting water blocking tape to accommodate the required radical water tightness and protect the
insulation core.
Outer sheath
The outer-sheath shall be of an extruded layer of black color
PVC.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.1. The products are mainly complying with IEC 60840 IEC 62067
standard, also can be produced according to OEM requirements and
other standards, such as bs standard, DIN standard, ASTM standard,
etc.
Shanghai Qifan Cable 12,131,163m Milestone in Y2020
2022-07-18
Shanghai Qifan Cable Co., Ltd, one of Top 20 cable manufacturers in
China, estabished its export dept in Jan of 2017. Its direct export
delivery has successfully achieved a milestone of 12,131,163 meters
during the year of 2020. This is a great achievement as the Covid-19 pandemic is having a
significant impact for global trade acitivity. Lockdowns, logistic, travel restriction are big challenages to us, and it is extremely difficult to manage
export business. None of this would be possible without our
colleagues' delication and hard work as well as our clients' strong
support. Therefore, we want to say a big thanks to them. We look
forward to working with you all in Y2021!
