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Presentation on rating of offshore wind farm power cables
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EXPORT CABLE OPTIMISATION FOR OFFSHORE WIND FARMSSimon CatmullProject Engineer
12/06/2013
1
OUTLINE OF THE APPROACH TAKEN
2
THERMALLY CONSTRAINED LOCATIONS
3
CABLE OVERVIEW
4
Conductor
XLPE Insulation
Polypropylene Filler
Lead Sheath
Armouring
CURRENT DESIGN METHODOLOGY – IEC60287
5
Wc Ws Wa
T1
T1
T1
T2T3 T4
3 3 3 ½ Wd½ Wd
Key Assumptions:
1.It’s all concentric circles. 3. Thermal resistances are constant.2.Burial depth is constant. 4. Current is constant at rated power.
Wc=Conductor losses. T1=Thermal resistance between conductor and sheath.Wd=Dielectric losses. T2=Thermal resistance between sheath and armour.Ws=Sheath losses. T3=Thermal resistance between armour and outer serving.Wa=Armour losses. T4=Thermal resistance between outer serving and burial.
EXPERIMENTAL SETUP
6
MEASURED DATA
7
MODEL VALIDATION – IN AIR
8
Initial Model Final Model
Interstices: Discrete polypropylene bundles with air gaps became homogenised volumes.
Semi-Conducting Screens: Thermal resistivity initially identical to XLPE but adjusted to account for heavy carbon doping.
Armour: Armour losses reduced by 40%.
LANDFALL MODELLING
9
Soil
Buried Cable
APPLICATION OF RESULTS: SIZING & NUMBER OF CABLES
10
Cable Cost
FURTHER WORK: J-TUBES / SANDWAVES
11
Bathymetry
12
QUESTIONS?
INSTRUMENTATION - THERMOCOUPLES
13
INSTRUMENTATION – DISTRIBUTED TEMPERATURE SENSOR
14