Subsea Power Connections that Work. 04 – 07 Feb 2013, Vienna, Austria. Contents. Experience History Concerns Design considerations Electrical Thermal Mechanical Conclusions. Experience. 120 years
04 – 07 Feb 2013, Vienna, Austria
Power cables have been around for a long time. Designs have evolved, new materials are being used. Challenges offshore remain.
More than 7,000 km of HV (≥ 60 kV) cables are in service (onshore, offshore), many more system-kilometres at 33 kV and below.
Many offshore wind farms have experienced problems with subsea power cables. Claim amounts related to cables top the list.
Data sources: Cigré (2009), Carter et al. (2009)
Failure statistics not yet available
Incidents in virtually every wind farm
Most often during construction
Sometimes during operation
Strong focus on price , not enough on risk
Lack of transfer of knowledge
“Industry best practice” yet to be developed
Data source: DNV stakeholder consultation
All relevant stakeholders consulted?
Started early with the planning and design?
Optimised and planned with contingencies?
3 x 1 x 240 mm2 Cu
33 (36) kV, 880 m
3 x 1 x 630 mm2 Cu
150 kV, 20,500 m
3 x 1 x 800 mm2 Cu
150 kV, 1,350 m
Reliability targets set?
Failure rates applicable?
Site, vessel data
electrical / thermal
Installation weather dependent?
Optimised for smooth installation?