NNG Crystal Rig – 400KV Balance of Plant

The contract scope for these Balance of Plant works required at Crystal Rig 400kV substation was to facilitate the Neart Na Gaoithe offshore windfarm connection. Access to the site just South of Dunbar was through an operational windfarm so consideration had to be given to a number of factors including the landowners agricultural activities, the existing windfarm operatives and safe transport of staff & materials to site

The works included the supply, handling, installation, testing and commissioning of plant and equipment associated with the extension of Crystal Rig 400kV substation to accommodate the connection of Neart Na Gaoithe windfarm. The scope also included new third main protection works on the neighbouring network.

An additional element as a result of multiple interfaces operating on site we were also required to work alongside SPEN and both the Civil and GIS contractors to decommission and dismantle equipment. We also had to facilitate safe delineated access from the substation front gate to their work locations and at times were required to work alongside or in proximity to SPEN, a GIS contractor, a Civil contractor, Crystal
Rig Operations and NNG Windfarm operatives.

Specific tasks onsite were:

Supply, installation and commissioning where appropriate of the following items:
400kV Busbars and stranded conductors
400kV Clamps and connectors
400KV Primary plant
Mechanical and electrical interlocking
Compound floodlighting, lighting columns and control devices
Above ground 400kV substation earthing for all new / existing main plant and equipment’s
Plant and equipment labelling including nameplates and supporting brackets
High frequency earthing for 400kV Surge arrestor and 400kV CVT
LVAC/DC, multicore, multi-pair and fibre optic cables
Erection of all AIS Post Insulators, CVTs, SAs
Install busbars to connect to high level reserve busbar
Installation of Protection & Control Panels
Protection & control relay panels


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