Hans Kvarme Nexans Norway AS Offshore vindkraft Oslo, 14. desember 2010
Nexans Norway AS Rognan Oslo (HQ) Namsos Langhus Karmøy Halden Telecom and Building Energy Networks Energy 2
Turn-key Supplier 1 Engineering/Design 3 Cable Manufacturing 2 Type Testing 4 Land Operations 5 Marine Operations
Halden Plant 2010
State of the art and latest technology developments in HVAC transmission 2002 Horns Rev 1 and 2 Offshore Wind Farm, 170kV 3x630 mm 2 2003 Smøla Wind Farm, 132kV 3x500 mm 2 2005 Barrow Offshore Wind Farm, 132kV 3x300 mm 2 2006 Lynn and Inner Dowsing 36kV 3x185-240-630-1000 mm 2 2007 Ormen Lange, 420kV 1x1200 mm² 2008 Wolfe Island Wind Farm, 245kV 3x500 mm 2 Fibre optic cable Conductor Armour wires Outer corrosion protection XLPE insulation system Lead sheath
Challenges related to offshore wind farms Very long 3-core cables at high voltage Increased transmitting capacity Dynamic applications Requirement for coilable designs Different ambient conditions along the cable route Extreme burial depths at land fall and/or dredged areas Different conductor cross sections along the cable route Shallow water installation IEC rating of three-core cables is not OK for typical submarine designs Incorrect loss distribution (the infamous armour loss) Solution: Cigre 2010 paper, B1_116 Customers tends to oversize cables Common approach required to optimize cable design
AC submarine cables Technological status Experience with XLPE insulated cables from 1960 s Long experience with MV (12-36 kv) submarine cables in both static and dynamic applications
AC submarine cables Technological status Nexans installed the worlds first 170 kv 3-core XLPE insulated submarine cable to the Horns Rev offshore wind farm in 2002. Cable length 21 km Power transmission capacity 160 MW Step 2 (210 MW) of this wind mill farm Horns Rev II (43 km) was installed in Oct. 2008
AC submarine cables
Wolfe Island Submarine Power Cable Location: Canada Customer: Canadian Renewable Energy Corporation (CREC) Description / Challenge World s first 3-core 245kV XLPE submarine cable Supply of related accessories Nexans Solution / Technology 8 km of TKRA 245kV 3x1x500mm 2 Spare cable joints Onshore accessories
Hywind Project Location: Norway Customer: Statoil Hydro Description / Challenge Supply of subsea cable for the world s first floating windmill Supply of related accessories Nexans Solution / Technology 11 km of XLPE 24kV + 24 FO submarine cable Spare cable joints Other accessories Marine installation
London Array Location: UK Scope of work: 4 export cables TKRA 170kV 3x1x630mm 2 TKRA 170kV 3x1x800mm 2 800mm 2 at each 3km end 47-48km 630mm 2 main length Delivery: 2 Cables in 2011 2 Cables in 2012
Belwind Location: Belgium Scope of work: 165MW TKRA 170kV 3x1x500/600mm 2 50km Windfarm 165 MW total, 1 export cables: 165MW/cable 55 turbines, 3MW each (Vestas) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
Lincs Offshore Windfarm Location: UK Customer: Centrica (Lincs) Ltd Scope of work: 250 MW TKRA 145kV 3x630/1000mm 2 Two lengths of 49km, 98km total Including a Fiber Optic element 84 fibers Joints, drum for spare length and accessories
Sheringham Shoal Location: UK Customer: SCIRA, Statoil (50 %) and Statkraft (50 %) Scope of work: 315 MW 2 x 21km TKRA 145 kv 3x1x630 mm² 2 x 0.2km TKRA 145 kv 3x1x1000 mm² Including a FO element Joints, spare length and accessories
Ormen Lange Grid Connection Location: UK Customer: Statnett Scope of work: 1000 MW TKRA 420kV 1x1200 mm² 4-500m land sections on both sides 2.4km submarine cable Maximum water depth of 210 m Transformer station 420 kv cable Nyhamna Transformer station
Conductor stress [MPa] Dynamic Applications Nexans Norway has experience with dynamic MV XLPE AC cables since 1980 ies Platforms, FPSO, floating wind turbines In-house expertise on dynamic analyses and cross section analyses by Riflex, UFLEX Cable capacity and extreme responses in the bend stiffener area Cable capacity 60 extreme responses 100% utilisation 80% utilisation 120 100 80 60 40 20 0 Cable 1 Cable 2 Cable 3 0 1000 2000 3000 4000 5000 Static water depth [m]
Very long cables (> 120 km, 7000 MT) Marine Installation - Laying
Protection Protection against hazards, such as Anchoring Fishing Dropped objects
Trenching in soft to hard sediments Trench depth 0.5-3 m Operation to 1000 m water depth Protection The CAPJET ROV system, by Nexans
Additional Protection Concrete bags Mattresses Rock dumping
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