Barhale’s team in Scotland successfully delivered all civil works,
including a new access road and substation platform, at the new
Chipperlaigan GIB compound in Ayrshire, Scotland for Iberdrola
Engineering and Construction.
The works were required to facilitate Iberdrola’s need to upgrade
their Kilmarnock to Coylton circuit. This overhead line cable circuit
runs north to south between Kilmarnock and Coylton with a ‘tee’
connection at the Chipperlaigan site, which enables the circuit to link
to the town of Ayr in the west. To accommodate a required increase
in load flow, the existing cable at Chipperlaigan was replaced with a
275kV Gas Insulated Busbar (GIB) arrangement.
To facilitate a grid connection for a proposed wind farm, Barhale were
tasked with the construction of a new substation control building and
associated civil works. Works took place to the west of the village of
Douglas in South Lanarkshire.
The new substation control building was a single story steel portal
frame structure, which was constructed on top of a reinforced
concrete floor slab. External facing bricks were constructed to a
defined level, in front of which an insulated aluminium cladding
façade was attached to the frame to provide the external walls. The
same cladding was attached to the top of the steel portal frame to
construct the roof structure.
National Grid supplies electricity through transmission networks, operating at 400kV and 275kV which connects to the three substations at Hackney, St John’s Wood and Willesden to supply points where power is fed into the local distribution system.
Within London, a network of 275kV cables were installed in the 1960’s which needed replacing, as they had reached the end of their technical life. Due to increasing electricity demands, the cables were upgraded and replaced with 400kV cables which were installed within a deep level tunnel.
Barhale were required to remove, demolish and replace a SGT2A, 275/33kV, 90MVA transformer with a 120MVA unit at a substation located approximately 5km east of Edinburgh City Centre, to ensure that the future maximum demand is met.
Undertaking this work brought additional working constraints with regards to working in and around a live substation and poor ground
conditions that required innovative design solutions and stakeholder liaison. Due to the adverse ground conditions, Barhale used a pilling
system for heavily loaded structures. Through using such expertise and experience of working in this environment, Barhale were able to
mitigate potential risks and facilitated the success of the project.
This was a live power station/132kV compound where initially, cables had to be diverted to allow access to build the new switchgear building and compound extension. Careful consideration was applied to ‘Ivy Bridge’ (a 700 year old listed structure) which was adjacent to the site and within a Site of Special Scientific Interest (SSSI).
Construction was phased to allow the customer’s electrical contractors on site to install plant and undertake cable connections.
The site spans the Partick to Charing Cross railway line, from an area within the Scottish Power Depot on St Vincent Crescent (North Side) to an area on Minerva Way (South Side). Barhale were responsible for the construction of RC Cable Bridge (Foundations, Abutments, Wingwalls) over a live Railway Line serving Glasgow Central. The bridge now meets the requirement to carry of series of high voltage cables over the railway line.
Barhale were awarded the Edinburgh zero waste project valued at £4.2m by Alauna Renewables. The contract was to design and build the steel frame industrial building, a new welfare and office block, suds pond, associated drainage works and constructed reinforced concrete hard standing access road and car parking.