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Modernisation and renewal of the Lieboch substation


On behalf of Energienetze Steiermark GmbH, EQOS Energie has modernised the Lieboch substation near Graz, which consists of a 9-bay switchgear including longitudinal and transverse couplings. The commission included system planning and renewal, disassembly of the old system and replacement of the associated 25-bay 20-kV protection and control technology.

The existing 110-kV open-air switchgear of the Lieboch substation with its many base components dated all the way back to 1979. Therefore, it was necessary to plan a comprehensive renewal programme in order to safeguard network selectivity – an important network protection function – and also to ensure a high degree of operational reliability now and in future. Furthermore, the renewal also increased transmissibility and resistance to short-circuiting. As part of the remodelling and rearrangement work, EQOS Energie executed the primary technology, which included planning, as well as the secondary technology.

With this project, EQOS Energie has made a significant contribution to ensuring an effective regional energy supply in the Styrian industrial region. To keep the substation functional during the entire remodelling project, all working steps took place during real-life operations
within the confines of a very tight schedule.

The project

Overview of services

  • Construction of 110-kV switchgear and renewal of 20-kV protection and control technology in real-life operation
  • All primary and secondary
    technical installations
  • Contribution to safeguarding the supply of electricity in the greater Graz region

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