Primary 11kV Substation Project


With a major expansion on site to increase production capacity planned for completion Q4 2014 our client had concerns over the supply of electricity to the plant. Understanding the difficulties in liaising with the site landlords and the distribution network operators (DNO) they engaged Addison to complete the design and build of the substation on a turnkey basis. The substation was a primary substation, 11kV 7.5 MVA. During the FEEP our clients worst fears were realised when an existing substation was put out of action following a fire. Addison had the knowledge and experience to overcome this by installing an external temporary HV substation within 2 weeks minimising disruption. The temporary substation had to be positioned not to impede the repair of the existing substation or construction of the new substation.


 ABB photo 1photo

Project Outline

Completed: December 2014
Client: Chemical Industry
Location: North West
Duration: 12 Months

Addison were appointed to conduct a FEED to ascertain the cost to build a new primary substation building complete with switchgear and associated equipment. Once sanctioned Addison provided a turnkey package for the build with all civil structural, electrical design, specification of equipment, project management, procurement and construction management provided in house. Our role also covered the commissioning of the switchgear and attending of FAT which was completed in house by our engineers.


  • Specification and procurement of switchgear
  • Design and build of a brick building for the substation including all civil/ground works associated.
  • Point of contact between the client and the electricity provider (DNO)
  • Fault and Load study completed
  • Protection grading study completed
  • The scope included 2 incomers / bus section, 16 outgoing to auxiliary feeders to substations and transformers.
  • Addison involved in FAT and commissioning of the equipment on site
  • The implementation included a phased transfer of feeders from old to new without disruption to supply


"I’d just like to let you know how impressed I’ve been with the way your engineers have worked together with us on this project." High Performance Plastics Producer