presentacion cables xlpe
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Underground Cable: an innovative and reliable Technology
Partial Undergrounding as an ecological Solution
Integration of Underground Cables in existing Networks
New Technologies
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XLPE indulated Cables
Commercially used since over 25 years (110 kV) Since over ten years successfull at 400 kV even at
long system length (40 km at 500 kV - Japan)
Worldwide established technology
easy to lay and to connect
Environment friendly
Low maintenance/ maintenance free
Underground Cable: an innovative and reliable Technology
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Sketch
Conductor Cu
(alternative Al) Inner Semiconducting
screen
XLPE Insulation
Outer Semiconductingscreen
Cu screen wires(longitudinal watertightness)
PE-sheath with integratedAl-Foil
Innovative & Zuverlssige Technologie
Underground Cable: an innovative and reliable Technology
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Accessories: Joints
400 kV underground cable
are produced and delivered
in length up to 1150 m
Joints will be laid invisibleunder the soil
Joints can be integrated
into underground buildings
Innovative & Zuverlssige TechnologieUnderground Cable: an innovative and reliable Technology
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Accessories: terminations
Outdoor termination as
a connection OHL
cables system Space needed: approx.
size of tennis court
Innovative & Zuverlssige TechnologieUnderground Cable: an innovative and reliable Technology
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Reliable technology
Good fault statistics, low number of faults
Undergroud cables are protected againstenvironmental conditions
In operation underground cables are maintenance freeand faults are often caused by external influences
Established Solution
Cable suppliers guarantee a reliable technique with ahomogeneous quality due to international standards
(IEC 62067) Repair in case of fault
Quick & precise localization of fault
Repair time 2-3 weeks (in case of cable reserve)
Innovative & Zuverlssige TechnologieUnderground Cable: an innovative and reliable Technology
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>30 kV DIN VDE 0276-632 45 kV - 150 kV
bis HD 632 45 kV - 150 kV
150 kV IEC 60840 45 kV - 150 kV
> 150 kV DIN VDE 0276-62067 (Entwurf) 220kV - 500kV
bis keine europische Norm
500 kV IEC 62067 220 kV - 500 kV
Innovative & Zuverlssige Technologie
Standards
Underground Cable: an innovative and reliable Technology
All systems must be prequalified and/or type tested
after the existing standards:
This involves a one year system test and a4 week long sequence of
electrical and mechanical tests (type test)
Each delivered cable or accessories must be
subjected to extended routine tests
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Prequalification test:
One year 100m cable and all accessories in
different laying situations, 180 heating cycles under
Voltage
Lightening impulse voltage test after thermaltreatment
At independant test laboratory
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Type test:
20 heating cycles under voltage
Tan , lighting impulse, switching impulse, PD
Mechanical and non-electrical tests
at independant test laboratory or with independent
inspector (e.g. KEMA)
Underground Cable: an innovative and reliable Technology
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Assorted References 400kV underground cable in Europe
Site Project Cable Systems x Length
(km)
Cable/
phase
date
Kopenhagen Replacement of existing OHL in urban area 1x22
1x12
1 1996
1999
Berlin Connection of east/west systems 2x6
2x6
1 1998
2000
York-Tal Area of natural beauty 4x6 2 2000/1
Madrid Barajas airport expansion 2x13 1 2002/3
Jutland Area of natural beauty, waterways and suburbal
area
2x14 1 2002/3
London London Ring 1x20 1 2002/5
Rotterdam Randstad water crossing 2x2.1 1 2004/5
Wien Electricity for the city center 2x5.5 1 2004/5
Mailand Suburban part of the Turbigo-Rho-Connection 2x8.5 2 2005/6
Innovative & Zuverlssige TechnologieUnderground Cable: an innovative and reliable Technology
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Number of underground systems EHV layed worldwide
Innovative & Zuverlssige TechnologieUnderground Cable: an innovative and reliable Technology
0
1
2
3
4
5
6
7
8
9
10
11
12
949596
97
9899
0001
0203
0405
0607
No.
systems
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Underground Cable: an innovative and reliable Technology
Partial Undergrounding as an ecological Solution
Integration of Underground Cables in existing Networks
New Technologies
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Partial Undergrounding as an ecological Solution
Space needed
Number of systems depending on transfer rate
Width of trace depending on number of systems needed Max. 2 systems needed for one OHL
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Urban Areas
One trench per system: ca. 1.5 meter depth, 1-2 meter width
Heavy equipment needed for civil works along the trench, butonly needed during laying along the trench at joint positions,
Undergrounding under, next and between roads possible
Original state of surface will be restored after installation
Umweltvertrgliche LsungPartial Undergrounding as an ecological Solution
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Rural Areas Civil work time depending on
Ground conditions
Heavy equipment needed for
civil works along the trench,
but only needed during laying
along the trench at joint positions
Various procedures to undergo
sensitive areas or streets
Landscape restored within 18-24
month
Umweltvertrgliche LsungPartial Undergrounding as an ecological Solution
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Possible heating of ground
Operating temperature of cable depends on the current carried & load factor
Heat distribution depends on the backfill material around the cable
Impact is strictly local and very limited (Ecofys 2008 report for Irish
government)
Extreme Conditions: Soil directly over the trench can heat up by approx. 2 C
5 metre from the cable, no impact
Temperature increase caused by 380kV single-
core XLPE cable calculated by FEM modelling
temperatures in the conductor plane ( ), in
the plane directly above cables ( ), and at
the cable surface ( ).Source: University Duisburg-Essen
Umweltvertrgliche LsungPartial Undergrounding as an ecological Solution
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Underground Cable: an innovative and reliable Technology
Partial Undergrounding as an ecological Solution
Integration of Underground Cables in existing Networks
New Technologies
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Underground Cable: an innovative and reliable Technology
Partial undergrounding as a economical Solution
Integration of Underground Cables in existing Networks
New Technologies
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New Technologies
Superconducting cables
RTTR (Real Time Thermal Rating)
Electromagnetic shielding (EMC)
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Cable Developments new
2005
1930 1940 1950 1960 1970 1980 1990 2000 2010 2015
VALfit plus (EMV) up to 170 kV2007
Low Pressure Oil filled cables
High Pressure Oil filled cables
Internal Gas Pressure cables
External Gas Pressure cables
PE cables
XLPE cables
City cables (3 core) up to 145 kV
Superconducting
Paper insulated
XLPE insulated 2009
Superconducting cables2001
VALfit (city cable inplastic tube) up to 145 kV
City cables up to 245 kV
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No new technologynkt cables has more than 9 years of operation experience!
Copenhagen, Denmark
30 m, 2.0 kA, 30 kV
104 MVA
12,000 h at 100% load
Years 2001 2003
DK utilities
Supplied 50,000 users
2 years operation!
Superconducting cables
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nkt cables - Certificates of Approval
Southwire, Carrollton, Georgia
Carrollton, U.S.A
30 m, 1.25 kA, 12.5 kV
27 MVA
50,000 h at 100% load
Years 2000 2006
Supplied energy to Southwire Cos
cable factories
Converted to test station
6 years operation!
Superconducting cables
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26
HTS Triax Energy CableSuitable for medium voltages (10-72 kV)
Former Dielectric Dielectric Dielectric Cryostat
Phase 1 HTS Phase 2 HTS Phase 3 HTS Copper Neutral
LN
LN
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New Technologies
Superconducting cables
RTTR (Real Time Thermal Rating)
Electromagnetic shielding (EMC)
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AB Bern 100414
Monitoring and Ratingby nkt cables
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AB Bern 100414
VALCAPHard-/Software Package
Load Control Software
- RTTR -
developed by nkt cables
Fiber Optic
TemperatureMonitoring
DTS Controller
Service and Engineering
by nkt cables
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AB Bern 100414
Our System thinking !
Load Control
Software - RTTR -
developed
by nkt cables
Fiber Optic
Temperature
Monitoring Device
DTS Controller
Service
Engineering
by nkt cables
Fiber Optic
Tubes/CableOverhead
Lines
Fiber Optic
Accessories
Fiber Optic
AccessoriesHV Cable
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AB Bern 100414
The Specification
Temperature Monitoring along an Optical Fiber (Raman effect)
Optical Fibre integrated in Cable/Conductor or placed upon
Max measuring length: 18km (36km)
Multichannel option - up to 8 channels
Spec. of Optical Fiber: Multimode
Hot spots can be detected Resolution up to 1m
RTTR Software
for load prediction and grid control assistance!!!
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1. Safety
Avoidance and reaction on critical load status
2. Efficiency
Utilize the existing capacity of your net to an optimum
3. Dynamic and Flexibility
With Dynamic Rating to a flexible energy highway
4. Transparancy
Analysis of condition, requirements and planning
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Real Time Thermal Rating
and Power Cables combined in one
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New Technologies
Superconducting cables
RTTR (Real Time Thermal Rating)
Electromagnetic shielding (EMC)
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conductor
XLPE insulation
APL sheath
earth conductors
magnetic screening
wire armour
PE pipe
Valfit+ Cable up to 245kVXLPE insulated cable in PE pipe
Electromagnetic shielding (EMC)
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Cable with internal magnetic screening
0,0
0,5
1,0
1,5
2,0
2,5
0 1 2 3 4 5 6 7 8 9 10
T
m
Distance from centre of trench
MagneticInduction
110 kV XLPE-cablel
1 System473 A / 90 MVA
Three core cable
in plastic pipe
Single core cable
in plastic pipe
Three core cable
in steel pipe
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3-core Valfit plus:
screening without steel pipe to approx. 0.2 T in 1.2
m distance (1000 A, 150 kV)
Electromagnetic shielding (EMC)
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Summary 400 kV cable systems are state of the art, reliable and
environment friendly solutions for energy transfer
Cable systems can be equipped with RTTR systems such as
VALCAP to maximize flexibility and the overall transfer rate
Cable systems allow to shield the magnetic field around the
trench
Superconducting cables are reliable alternatives for energy
transfer in special situations
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Thank you!
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