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AtkinsRéalis undertook the Principal Designer role during Front End Engineering Design (FEED), detail design phase and construction phases in accordance with National Grid Electricity Transmission (NGET) project life cycle for replacement of Supergrid Transformer 2 (SGT2) at Tinsley Park 275kV substation. This SGT was identified as requiring replacement due to its asset health condition.

 

Our Approach

AtkinsRéalis worked closely with NGET to resolve several complex issues for this multifaceted project. This required a multidisciplinary approach (including HV plant, protection & control (P&C), civils, surveys and project management) by holistic team coordination and execution of design drawings using Computer Aided Design (CAD) software.In accordance with NGET standards and specifications, SGT2B was proposed to be replaced in-situ and the scope of works for this project included:

  • Decommissioning, demolition, and disposal of existing SGT2B.
  • Civil works required to accommodate new SGT.
  • Installation of new Siemens SGT rated at 275/33kV, 120MVA, insulated with mineral oil.
  • Supply and installation of busbar to connect new SGT to existing 33kV and 275kV bays.
  • P&C works associated with the SGT replacement.
 
Outcomes Delivered
  • Reuse of existing civil structures to meet requirements of new SGT resulted in AtkinsRéalis redesigning modifications of existing plinths and bund area to suit loading and clearances.
  • Space and clearance restrictions associated with rearranging 33kV busbar system were resolved by AtkinsRéalis through a coordinated design of an innovation 33kV busbar system.• AtkinsRéalis coordinated a safe design and systems of works to limit impact to existing services (including cables, HV equipment, and skidding system) which interacted with the SGT plinth.
  • Existing P&C interfacing arrangement did not meet current NGET standards, which was resolved by AtkinsRéalis redesigning a new interfacing arrangement, with an approach of reusing most of the existing equipment.
  • Fire risk analysis was conducted to assess the impact of the new SGT, and the mitigations required. AtkinsRéalis advised NGET to reinstate a firewall.
 
Throughout the project AtkinsRéalis worked closely with NGET to develop a Carbon Interface Tool (CIT) and Project Sustainability Action Plan (PSAP) to ensure that NGET commitments of carbon footprint reporting, environmental and sustainability resolutions are met.
 
During site walkovers, AtkinsRéalis used innovative 360° cameras to record the site and equipment. The footage allows for 360° pan and tilt on video, including zoom on pictures. This footage was used extensively over the design period to deliver the scope. This provided cost saving benefits from the re-usability of the footage for the client and a reduction in staff mobilisation and demobilisation costs from a perspective of project delivery. The use of 360° imagery greatly increased efficiency of site visits, making virtual site walkthroughs possible and reducing the carbon footprint of the project.
 
 


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