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AtkinsRéalis carried out optioneering and FEED design for National Grid Electricity Transmission (NGET) for the Hackney Waltham Cross Uprating (HWUP) - North London Reinforcement scheme. This scheme required NGET to uprate an existing 275kV overhead line route and substation equipment across six substations. This included a new gas insulated substation, multiple transformer replacements, and installation of quad boosters and MSCDNs.
 
Our approach
 
AtkinsRéalis worked closely with NGET to deliver multidisciplinary substation designs (including HV plant, civil, cable, and protection & control) and project management services located in both the UK and our Global Technology Centre to deliver an effective solution that delivered to Time, Quality and Cost to our client. We ensured our designs were compliant with NGET standards and ensured planning DCO constraints were taken into consideration. AtkinsRéalis worked closely with NGET engineers and site operatives, and other consultants who delivered the overhead line (OHL) scope.
 
AtkinsRéalis survey and environmental team with input from our Planning and Consents team delivered a full scope of surveys, including:
  • Underground service and unexploded ordnance searches.
  • Geotechnical and geoenvironmental studies, and ground investigations.
  • Civil condition assessments.
  • Ground penetrating radar and topographical surveys.
  • Flood risk and ecology assessment.
  • Construction traffic management plans.

 

Outcomes delivered

  • Optioneered optimised substation layout to locate two quad boosters and two MSCDN units on a constrained site, considering environmental impacts and OHL restrictions.
  • Designed non-SF6 gas insulated substation with corresponding construction sequence to minimise need for circuit outages.
  • Completed designs for multiple 3000mm2400kV cables, routed through complex environments and water crossings.
  • Complied with DCO and planning requirements.
  • Utilised innovative 360° camera footage of each substation to reduce carbon and time impacts from site visits, allowing for virtual site walkdowns to be conducted.
  • Optimised designs for transformer replacements and use of non-SF6 equipment.

 

 

 


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