• Flintshire Bridge

  • Flintshire Bridge

  • Flintshire Bridge

  • CLIENT: John Sisk & Sons Ltd
  • VALUE: £2.5 Million
  • DATE: February 2014 -June 2015
  • LOCATION: North Wales

Flintshire Bridge 400kV Convertor Station

OBR Construction Ltd has been awarded a £2.1m RC package comprising of 23,000m3 of concrete by John Sisk & Sons Ltd who in turn are carrying out the works for Siemens. The project is a 400KV Converter Station located in Flintshire Bridge, Connah’s Quay in North Wales. OBR works entail the construction of 2 nr 46m long 26m high fire walls which incorporate the transformers, and construction of various structures and bases throughout the site. OBR works commenced on 31st January 2014 and will continue until December 2014.

A brief description of the project is outlined below. The Western High Voltage Direct Current (HVDC) Link is a major electricity transmission project being jointly developed by National Grid Electricity Transmission (NGET) and Scottish Power Transmission (SPT). It will connect the high voltage transmission networks in south west Scotland and North Wales via a subsea HVDC link which will provide approximately 2 GW of additional capacity on the Great Britain (GB) HVDC Link and technology.

The key elements of the Western Link HVDC project are: • Two 2GW converter stations, one at Hunterston in SW Scotland adjacent to the Hunterston A power station and the other at Connahs Quay in North Wales adjacent to CHP Power Station. Each converter station comprises a HVDC converter, an AC switchyard, switchgear, filters, reactors and transformers, valve and converter equipment and buildings for control and auxiliaries equipment. • A HVDC submarine cable of approximate length 350km between landfalls at Hunterston and Connahs Quay. The final length will depend on the exact routing. The configuration of the cable is dependant on the system selection. • At the Connahs Quay landfall, the Wirral, the onshore HVDC land section extends for approximately 40km.

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