Substation wind farm Steinriegel III

Reliable integration into the electricity grid 

Wien Energie GmbH is carrying out a comprehensive repowering project at the Steinriegel III wind farm in Styria. The energy generated will be fed into the transformer station planned by us in the northern part of the project area via a 30 kV underground cable. We are setting new standards with the planning of a 110 kV transformer station directly in the wind farm site on the mountain and a powerful 110 kV underground cable from the mountain to the valley. Our in-depth grid and electrical engineering expertise formed the basis for an efficient and future-proof grid connection. 

Project highlights

• The site of the planned substation is located in challenging, alpine terrain at around 1,500 metres above sea level, a particular challenge.
• The complete technical planning and concept development of the substation, including the grid shape, transformers and switchgear,  was carried out by the EWS team. Comprehensive grid analyses, such as load flow studies and short-circuit calculations, were also carried out for the entire generation grid.
• The building planning included all structural aspects such as foundations, footings, cable cellars and an adapted drainage concept.
• The 110 kV high-voltage transmission is realised via a redundant underground cable system, which was specially adapted to the topographical conditions.
• The GIS system (gas-insulated switchgear) at 110 kV level was designed to be completely SF₆-free - a pioneering contribution to environmental protection.
• Due to the altitude and the special climatic conditions, close coordination took place with the component manufacturers, particularly with regard to gas-insulated system parts and the access route for transport and installation.