Offshore Power Cable Installation
Transcript of Offshore Power Cable Installation
ICOE: Halifax 11/2014
Offshore cable installation is organized into 3 Sectors ◦ 1. Array: Interconnecting a grid of offshore wind turbines
via a subsea cable system 33KV with 66KV being developed
◦ 2. Export: Connecting an offshore windfarm to an onshore power grid via a subsea cable system HVAC or HVDC
◦ 3. Interconnect: Connecting 2 or more power grids
via a subsea cable system HVDC or HVAC
Export & Interconnect projects are similar, Different vessels, equipment and expertise is required for Array market
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Interconnect
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Export/Interconnect Cable (HVDC) ◦ Weight will be comparable to HVAC, but will consist of
two cables adding an additional wrinkle to cable handling.
Export/Interconnect Cable (HVAC) range ◦ Diameter: 200mm-225mm (appx 8”-9”) ◦ Weight in air: 80kg/m to 90kg/m. (176-200lbs/m.) ◦ Minimum Bend Radius: 3.3m
Array Cable range ◦ Diameter:100mm-150mm (appx 4”-5”) ◦ Weight in air: 21kg/m to 58kg/m. (46-127lbs/m.) ◦ Minimum Bend Radius: 2.2m
Array Cable
Export/Interconnect (left)
Array Cable
(right)
Note: As there is little/no marine cable manufacturing in North America - offshore cable comes from Europe or Asia – if
it is not transported on the installation vessel cost effective shipping, transfer and storage is required
Export/Interconnect Cable
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Cable Shipping & Transport
Export/Interconnect Main Lay Vessel
Array Main Lay Vessel
Cable Burial/ROV Vessel
Cable Storage Facility
Cable Maintenance Vessel
Personnel Transfer Vessel(s)
Guard Vessel(s)
Shipyard Access for Modifications, Mobilization, Demobilization
Cable Manufacturing Facility with ocean access
6 Photo: Global Marine
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- Health & Safety - Project Engineering - Project Asset Management - Fleet Operations Mgmt - Vessel/Barge Operations - Safe and efficient operation all working decks - Contract Compliance -Operational readiness of back deck equipment. -Operational readiness of Subsea equipment. - ROV operations. - Management of Survey office/equipment. - Calibration/Operation of all Survey equipment/data. - Project data management - Operations & Maintenance
Developing these resources is a major market challenge
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Source: Crown Estate
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Source: Friends of the Supergrid
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On- Land Offshore
Photo: Global Marine