There has been a 220 kV outdoor substation in Veytaux in the canton of Vaud, south-east of Montreux, since the beginning of the 1970s. Due to the nationwide development of a 380 kV high-voltage network, the expansion of the pumped storage power plant at Forces Motrices Hongrin-Léman S.A. (FMHL), the age of the plant, and environmental reasons, it had become necessary to reconfigure the substation. On behalf of Swissgrid, Alpiq EnerTrans therefore replaced the existing high-voltage substation with two new ones in a series of stages between 2011 and 2016.
The first of these two substations has, like the old one, a voltage of 220 kV. It replaces the original plant, which was over 40 years old, with a new gas-insulated substation (GIS). It has been connected to the existing Veytaux I FMHL power plant with a capacity of 240 MW. The second GIS substation operates at a voltage of 380 kV and is connected to the modern pumped storage power plant currently under construction, Veytaux II. This will commence operations in 2016 with an additional capacity of 240 MW. The two substations therefore serve to connect the two power stations to the high-voltage grid.
Two 380/220 kV (150 MVA) transformers ensure that energy can be exchanged between the pumped storage power plant and the public network. A new control system conforming to the IEC 61850 standard is also in place across the board, allowing remote control of the substation through Swissgrid Control.
The experts from Alpiq EnerTrans were part of the general planning for this project. Specifically, this means they headed the preliminary project and the construction project, and they handled all legal questions, the planning application to the authorities (with support from an FMHL representative and Alpiq Suisse), invitations to tender, bids and acceptance inspections. Alpiq EnerTrans was also responsible for the engineering, construction management, installation, commissioning and safety concept.
The new substations correspond not only to the latest technical requirements, they are also incorporated in a particularly unobtrusive manner into the landscape of the Gruyère Pays-d’Enhaut regional nature park. This was a complicated solution, but one that paid off.
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