presentacion cables xlpe

8/13/2019 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



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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



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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



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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)



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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


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)



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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



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Number of underground systems EHV layed worldwide


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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New Technologies


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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



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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



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New Technologies


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Partial undergrounding as a economical Solution


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!



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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!



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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





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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





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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



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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)



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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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