Substation Installation


Substation and switchgear replacement

We have an extensive in house capability to complete substation replacements whilst handling all engineering issues including outage planning as well as the building and civil aspects to deliver a seamless service. Installation and commissioning is completed by our in-house teams comprising primary and electrical fitters, HV cable jointers, civil operatives, site supervisors and site managers. Our commissioning engineers are fully trained on both legacy and new technology and are equipped with the latest test equipment. Our teams are very experienced in construction of new and retro fit oil containment systems for grid and primary transformers in live substations to enable our clients to comply with environmental legislation. From the smallest protection relay change to major turnkey design and build contracts, we operate UK wide and provide a complete range of services addressing the needs of the industry. Our dedicated team of engineers can take a project from concept to completion which includes:-

  • On-site integration to connect renewable schemes to the grid
  • Design and build of electrical power systems for wind, solar & hydro electric schemes
  • Underground cable installation (with pilots & SCADA as required)
  • Substation design for connection to grid and private network including all civil works
  • HV/ LV switchgear, HV/ LV transformers and protection
  • Testing & commissioning
  • Consultancy & design services
  • Connection design & negotiations with DNO's
  • Turnkey project management and full commissioning of G59/G75 and protection


    Our Project Managers take full end to end ownership of any project, including the role of Principal Contractor under CDM2007 and ensure all project deliverables are met through the implementation of thorough and rigorous project plans, including procurement of all goods and services required.


    From a low voltage sub-main right through to full 33kV systems, HV Power has the knowledge, experience and aptitude to ensure that system installations ,alterations and decommissioning of equipment is carried out to the highest of standards and within defined time scales. Following completion we will ensure that continued support is given to the client on the new installation. All fitters are experienced in the installation, maintenance and testing of most types of 11kv switchgear and protection systems, we can undertake repairs to existing switchgear.

  • Removal of apparatus - system isolation, phased shutdown procedures
  • Disposal of apparatus - assessment of contaminants and correct disposal
  • Oil filled, Vacuum and SF6 Switchgear

    © Computer Support, Barmouth.