Scope of Work
Categories:
Submarine Cable DesignSubmarine Cable ManufactureSubmarine Cable InstallationOnshore Cable DesignOnshore Cable ManufactureOnshore Cable Installation
Lifecycle Stages:
DevelopmentConstruction
Quantities:170 km submarine cable (offshore_grid_connection), 90 onshore_cables, 0.02 km submarine cable (inter_platform)
Cable Specifications:
TypeHVDC
Purposeoffshore grid connection
Voltage320 kV
Route Length130 km
Source text:
±320 kV bipole HVDC export cable system between HelWin Beta offshore converter platform and Büttel onshore converter station, total route length about 130 km (85 km subsea, 45 km land) for the HelWin2 grid connection.
Contract Details
Description
Prysmian Group was awarded a contract worth in excess of €200 million by TenneT for the HelWin2 offshore grid connection in the German North Sea, as part of a wider consortium contract with Siemens Energy. Under this turnkey scope Prysmian was responsible for the design, manufacture, supply, installation, testing and commissioning of both the submarine and land cable systems. The project uses extruded ±320 kV HVDC cables to transmit up to 690 MW from the HelWin Beta offshore converter platform to the onshore converter station at Büttel along an approximately 130 km route, comprising about 85 km of subsea cable and 45 km of underground land cable. Prysmian also supplied and installed the 155 kV HVAC submarine cables linking HelWin Beta to the offshore wind farm transformer platforms, as well as the Feltoflex HV 155 kV ultra-flexible inter-platform cable connection between HelWin Beta and the neighbouring HelWin Alpha platform. Cable manufacturing took place between 2012 and 2014, with the HelWin2 link commissioned and handed over for commercial operation in 2015.