High-temperature superconductor technology(HTS) is the key technology fortomorrow’s electricity market. Compared with copper conductors, HTS ceramic cableshave a number of signifi cant advantages. For example they can conduct electric current without resistance at app. 200°C below zero. Transmission capacity is five timeshigher than that of conductors made of copper, while current loss is reduced to one tenth. The development of HTS cables is inseparably linked to the name nkt cables. However, nkt cables is not just one of the ...
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Fig.
Step two
The HTS Triax™ cable core provided in
lengths km. Cable
over-length introduced through patented
procedure that the thermal shrinkage can
be accommodated. The work outside the
station areas now complete and there are
no further disturbances the public space. The cryostats are provided as
flexible rigid sections, depending the
curvature the cable route.
nkt cables has developed innovative
new installation procedure, the HTS Two-
Prelude
In the prelude the installation procedure,
the trench excavated, ducts are instal-
led, and concrete other suitable protection
is installed.1).8
Making easy …
The HTS Triax™ Energy Cables are well-
suited for installation high-density city
areas where disturbances traffic and
infrastructure need kept minimum. Any open trenches can be
re-closed even before the cable installation
starts, and the access-holes need stay
open for only minimum amount time.
In the case retrofit into existing duct,
the old cables are removed through access
holes located the old cable joints. The trench then re-closed
with rock, sand soil. The old
cable sent for recycling, while the duct is
cleaned and lubricated.
Culmination
The HTS Triax™ Energy Cable system is
completed terminating the cable the sta-
tion areas, and connecting and starting the
cooling system.
With nkt cables’ HTS Two-Step™ Installation
approach, the cable joints can spaced up
to apart and there only one joint per
three-phase cable.
Step one
In the first installation step, the thermally
insulating tube (the “Cryostat”) provided
in lengths 100-700 Shorter sections
are joined together they are pulled into
the duct, for distances 500-700 at
a time (Fig.
Step™ Installation, where the cable core can
be installed separately from the thermally
insulating tube. soon the cable place,
the cryostat sections are joined together,
and the access holes can closed. 2). Spacings are
left between successive cryostats. This gives higher flexibility
and quicker response the requirements of
each installation site, and above all, reduces
the number cable joints. inserted one end
of the trench, and pulled through several cry-
ostat sections, with the help cable pushers
placed the spacings between cryostat sec-
tions (Fig. There are special
requirements the thermal properties of
the refill, since the HTS Triax™ Energy Cable
does not release heat into the trench. 2
Installation and Protection
HTS Two-Step™ Installation
.
Fig
