Sweden Substation

Project Scope

  • Client in Sweden require an upgrade of an existing 33/11 kV Substation​
  • Requirement for interfaces with legacy equipment on the brownfield site​
  • Minimal outage windows for transfer of 26 no. 11 kV Circuits​


Hässelby, Sweden


33 / 11 kV


Completion Date


  • H&MV are responsible for the project management of the installation of a new 360 MVA 400/132 kV transformer AIS switchgear bay
  • H&MV staff hold appropriate DNO’s Authorisations so therefore have the skills and competencies to deliver this project
  • H&MV are ensuring early engagement with DNO to ensure outage dates and commissioning plans are met

H&MV Solution

  • H&MV project managed the design and construction of the 33 / 11 kV station refurbishment, which includes a building extension for the new control systems, cable ducting and new control system.
  • Supply and installation of new 11 kV switchgear fully equipped with relay protection and pressure relief.
  • Design, procure and install Control & Protection system for new 11 kV System.

Technical Information

  • The scope of this project is to replace old high voltage equipment and establish a new control system for the 33 / 11 kV switchgear.
  • H&MV constructed a new extension to the building to house the new control system, and new cable ducts from the new control building to the switchgear.
  • The existing building was refurbished with 2 new battery rooms, a new ventilation system and new control and monitoring facility for the entire property.
  • Responsible for issuing the Integrated Test Plans ( ITPs ), Construction Management Plans, Quality Plans, Safety Management Plan and Temporary Works Register.
  • Daily tool box talks, weekly progress and safety meetings, issue and risk management along with monthly status reporting.
  • Full civil design of the Control Room and electrical layout of the substation.
  • Installation of new 11 kV switchgear fully equipped with relay protection, pressure relief etc.
  • New zero-point and local power transformers for the 11 kV including zero-point resistance.
  • New station control facility, 11 kV power cables and control cabling throughout the facility.
  • A complete set of as-built drawings and a safety handover file will be provided at completion.

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