132 kV Line Massaboden–Granges Relocation
Power supply maintanance of the Swiss Federal Railway (SBB)
The power supply of the Swiss Federal Railway (SBB) throughout Switzerland is mainly fed by its own hydropower plants. The energy is transmitted through transmission lines whose voltage levels are being raised from 66 kV to 132 kV. Due to the construction of the National Highway N9 in Wallis, several sections of the 132 kV transmission lines Massaboden–Vernayaz will have to be relocated.
For the 132 kV lines, concrete poles of single tower types will be used. These are equipped with 4 Aldrey single conductors (550 mm2) and one earthwire Alumoweld-Aldrey (400 mm2) with a coaxial core.
The client has requested the shortest possible power interruption during the relocation process.
An additional key feature is the replacement of different MV and LV lines.
The time schedule of the different phases of the transmission line relocation is mainly dependent on the construction schedule of the national highway.
- Right-of-way survey in consideration of several obstacles such as, the border zone of the Rhone River, cross country gas pipelines, railway installations, new and existing cantonal roads with overpasses and bridges, other transmission lines, MV and LV lines, approaching lanes to airfields
- Studies of different alternatives due to highway project changes
- Project design and computation of steel towers, foundation and protection against difficult obstacles
- Cost estimate for each sector of the reconstruction phases
- Specification of materials
- Tendering process, bid evaluation and contract documents,
- Site management and site supervision