Mettlen–Lavorgo powerline
Template:Short description Template:Infobox power transmission line The Mettlen–Lavorgo powerline, also called the Lukmanier powerline, is the 400 kV three-phase alternating current high voltage electric power transmission line over the Lukmanier Pass in Switzerland, from Mettlen substation (Template:Coord), next Inwil, about Template:Convert south of Hochdorf, to Lavorgo substation (Template:Coord), next Lavorgo, about Template:Convert south of Faido. Trees falling on the line in 2003 caused a major blackout in Italy.<ref name=bbc271004/>
HistoryEdit
The powerline was built in 1948–1949. In 2006, 17 transmission towers between Sisikon and Ingenbohl and in 2008, 28 transmission towers between Arth and Küssnacht am Rigi were replaced.<ref name=alpiq2> {{#invoke:citation/CS1|citation |CitationClass=web }} </ref>
On 28 September 2003, during a storm, two trees hit the powerline in Brunnen, causing a major blackout in Italy.<ref name=bbc271004> Template:Cite news </ref><ref name=lukszo> Template:Cite book </ref><ref name=iea> Template:Cite conference </ref> The loss of power affected most of all peninsula; nearly 50 million people remained cut-off for up to 18 hours.<ref name=bbc271004/>
DescriptionEdit
On the Template:Convert long section from Mettlen to Amsteg it shares the pylons with the Gotthard Powerline. After Amsteg the Lukmanier Powerline runs on its own track.
On the section between Mettlen and Amsteg 160 pylons are used with two level and three level arrangements of the conductors. For the Template:Convert long section between Amsteg and Lavorgo over the Lukmanier Pass 145 pylons for one circuit with one level arrangement of the three conductors are used. The mean height of the used pylons is Template:Convert.
A unique aspect of this line is the 75-metre-high anchor pylon, which stands on 28-metre-high feet of concrete in the artificial lake of Santa Maria, canton Graubünden. This pylon was built in 1949 as a normal pylon. At the construction of the Santa María Dam it was replaced in 1957 by the existing pylon on concrete feet to protect the steel construction from the water and at wintertime from ice on the lake. This pylon carries one crossarm for one circuit. The mean span width of the line is Template:Convert, the biggest span width between two pylons is Template:Convert. As conductors bundles of two and three conductors of Aldrey (an aluminium-magnesium-silicon alloy) with a cross section of Template:Convert are used. The diameter of each single conductor is Template:Convert. As ground wire two steel ropes with a cross section of Template:Convert are used.
In the Mittelplatten area, the culminating point, the powerline consists of the highest transmission tower in the Swiss power grid, stationed Template:Convert above sea level. The steel lattice mast is Template:Convert tall.<ref name=alpiq> Template:Cite press release </ref>
SourcesEdit
- Elektro-Energietechnik 2, Prof. Dipl.-Ing. Dr. sc. techn. Gerhard Schwickaardi, AT Verlag Aarau, 1979, pages 218–220
- Gerhard Schwickardi, Elektro-Energietechnik. Energie-Übertragung, Netze, Energieverteilung, Freileitungen, Kabelleitungen, Schaltgeräte, Schaltanlagen, Energie-Umformung, Messwandler, Transformatorenstationen, Unterwerke, Automatisierung von Schaltwarten, Band 2, Aarau, Stuttgart 1979 Template:ISBN