Contestable Works up to 132kV
Civil and Electrical Design
Balance of Plant
DNO & National Grid Authorised Staff
Transformer Installation & Maintenance
Switchgear Installation & Maintenance
Installation & Commissioning up to 275kV


HVSS can carry out the following activities

  • Transformer Installation
  • AIS switchgear Installation
  • Busbar Systems
  • Switchgear installation
  • HV cable installation
  • HV Jointing/terminations Earthing Containment/multicore Installation
  • Protection Modifications
  • Battery Chargers/UPS Systems
  • LVAC Systems

Testing & Commissioning

HVSS can carry out testing and commissioning of the following

  • Relay and control panels
  • Power and Auxiliary transformers
  • Reactors
  • Capacitor banks
  • Rectifiers
  • AIS/GIS switchgear
  • MV/LV switchgear
  • Cable installations
  • LVAC systems
  • Battery Chargers/UPS Systems


HVSS specialises in an variety of design & calculation services:

  • Primary & Secondary electrical design drawings preparation as per tender documents.
  • Interface works:- Cable schedule & Core sheets preparation.
  • Relay Settings Calculation