CU/XLPE/CAS/PVC 38/66KV 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 insulation
Corugation aluminum sheath
PVC or PE sheath
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
Conductor
The 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 standard, also
can be produced according to OEM requirements and other standards,
such as bs standard, DIN standard, ASTM standard, etc.
CABLE SELECTION It is essential that the type of cable ordered is
suitable for its intended use. Cable choice will be based on a
whole range of factors including installation specifications,
relevant local regulations and the performance of appropriate cable
types. It is therefore impossible to provide a conclusive guide to
cable selection and we would advise you to contact us for our
specialist advice on suitable designs to meet your specific cable
needs.
XLPE (cross-linked polyethylene) insulated cable refers to an
electrical cable that has conductors insulated with XLPE material.
XLPE is a thermosetting polymer known for its excellent electrical
properties, making it a popular choice for various applications in
the power transmission and distribution industry.
Insulation Material: XLPE is a type of polyethylene that is
chemically cross-linked. This cross-linking process improves the
thermal and mechanical properties of the insulation, making it more
robust and durable compared to non-cross-linked materials.
Electrical Performance: XLPE insulation offers high dielectric
strength, low dielectric losses, and excellent insulation
resistance. This allows for efficient power transmission while
minimizing energy losses.
Thermal Properties: XLPE insulation can withstand higher operating
temperatures than traditional PVC (polyvinyl chloride) insulation.
This makes XLPE cables suitable for applications that require
higher temperature ratings.
Environmental Resistance: XLPE insulation provides good resistance
to moisture, chemicals, and environmental stresses, such as UV
radiation. This makes XLPE cables suitable for indoor and outdoor
installations.
Low Smoke and Halogen-Free Options: XLPE cables are available in
low smoke and halogen-free variants. These cables are designed to
minimize the release of smoke and toxic gases in the event of a
fire, enhancing safety in critical applications.
Wide Range of Applications: XLPE insulated cables are widely used
in power distribution networks, industrial installations,
commercial buildings, underground and overhead installations,
renewable energy projects, and more. They are suitable for both low
voltage and high voltage applications.
International Standards: XLPE insulated cables are manufactured in
accordance with various international standards, such as IEC
(International Electrotechnical Commission), ASTM (American Society
for Testing and Materials), and BS (British Standards). Compliance
with these standards ensures the quality and performance of the
cables.