Tarmac Station

Project Scope

Our client required for an upgrade at Tarmac Substation with minimal outages to enable continuity of supply.

Replacement of Paper Insulated Lead Covered (PILC) cables was also reqired.


United Kingdom


11 kV

Completion Date


Project Description

  • As Principle Contractor H&MV project managed the design and installation of the refurbishment of the 11 / 33 kV Substations at Tarmac.
  • Installation and commissioning of 14 no. ABB Unigear 500 R Cubicles, 2 Protection Panels and 11 kV circuits with XLPE cable.
  • Delivered successfully and H&MV have been awarded subsequent upgrades with Tarmac in the UK.

Technical Information

  • Design and build up upgrade works at 11 kV and 33 kV at Tarmac’s plant.
  • Supply and installation of 14 no. ABB Unigear 500 R cubicles, 2 no. protection panels, 11 kV cable, inclusive of jointing and terminating. Refurbished the OLTC tap changers on the transformers.
  • Comms 600 IEC 61850 Control system in conjunction with ABB.
  • Cable diversions of all existing 11 kV circuits associated with main sub 1 and the design and procurement of a containerised 11 kV substation to Scottish Power standards.
  • Protection and control system upgrade for two main 33 / 11 kV 24 MVA grid transformers and commissioning of Comm 600 Interface, MMI and OPC interface 6.
  • All functional testing and commissioning including, high voltage pressure test, primary and secondary injection of protective relays, mechanical interlocks, electrical interlocks, LV controls, indications, and DC tripping circuits.

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