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Development, consultancy, planning and design, cost-optimization, production, logistics, installation and service. With this all-round support the nkt cables HV-team will be at ourcustomer’s service in regard of the products high voltage and extra-high voltage cables and accessories. Optimized internal communication systems, specialized divisions and intensively trained team members are the power behind the customer-orientated installation solutions. With competence and know-how the nkt cables “Power Team” provides secure and reliable power supply wherever fully developed high-voltage power transmission is ...
are available.
For other types and data please contact nkt cables.
As the XLPE insulated cables not require
an internal overpressure, they are usually
equipped with copper wire screen.
The current ratings are calculated for standard conditions, which are:
soil thermal resistivity, moist/dry 1,0/2,5 Km/W
soil temperature °C
laying depth 1,2 m
for cables touching trefoil formation, screens solidly earthed
axial distance two circuits 0,5 m
cables flat formation, screens cross bonded
axial distance between phases 0,2 m
axial distance two circuits 0,9 m
A wide variety high voltage cable designs
is offered nkt cables provide most eco-
nomic solutions.
Available conductor constructions:
round solid conductors 2000mm2
(RE)
circular stranded compacted conductors
up 1200mm2
(RM)
circular conductors with shaped wires up
to 2000mm2
(RM, Keystone conductors)
segmental conductors 2500mm2
(RMS, Milliken conductors)
oval shaped stranded compacted con-
ductors 800mm2
for external gas
pressure cables (OM)
The conductors are manufactured meet
the requirements the relevant national and
international standards.
Technical Data
The following tables summarize several significant data various cable types. Highest quality standards
together with latest process control equip-
ment and combined with decades of
experience ensure manufacture cables
meeting the highest requirements and
enabling development most advanced
power cable systems.4
The Cables
Product Scope
Besides XLPE insulated cables nkt cables still produces paper insulated cables.
A combination the copper wire screen with
a metal sheath also possible. Subsequently the paper insulated
For other types and data please contact
The current ratings are calculated for standard conditions, which are:
soil thermal resistivity, moist/dry
soil temperature
laying depth
for cables touching trefoil formation, screens solidly earthed
cables flat formation, screens cross bonded
. For all XLPE
insulated high voltage cables, the space
between cable core and water barrier made
longitudinally watertight.
Metallic Covering
Conventional paper insulated cables require
a pressure proof and watertight metallic
enclosure, acting also metallic screen.
Conductors
The cable conductors can made copper
or aluminium.
At nkt cables both, extruded lead sheath as
well the aluminium sheath can applied.
Design and Manufacture
Um
/kV 72,5 123 145 170 245 300 420 550
External Gas Pressure Cable X
Internal Gas Pressure Cable X
XLPE Cable X
CityCable VALFIT®
X X
cable cores are impregnated appropriate
vessels with low viscous oil high viscous
compound. For special applica-
tions the conductors can made watertight.
These types metal sheaths are, course,
also used XLPE insulated cables. Various types conductors,
insulation, metallic screening and sheathing,
corrosion protective layers etc.
For manufacture XLPE insulated high
voltage cables, nkt cables disposes four
extrusion lines. The choice matter of
customer’s preference current carrying
capacity. For radi-
al moisture barrier coated aluminium foil is
longitudinally applied.
Insulation
The insulations for low pressure oil filled
cables and for conventional pipe type cables
are lapped from high quality insulating
papers. Large size solid conductors are
made aluminium. This
solution provides high short circuit capability
and watertightness combined with lowest
weight and smallest dimensions. The combination with
the polyethylene oversheath called alumini-
um polyethylene laminated (APL) sheath. While the
lead sheath leads smaller dimensions, the
aluminium sheath provides high short circuit
current carrying capability and lower weight
