Mettlen–Lavorgo powerline
The Lukmanier line is a 380 kV three-phase high voltage line over the Lukmanierpass in Switzerland. The approximately 100 -kilometer transmission line was built in the years 1948 until 1949. Like the entire Swiss high -voltage power grid operated by the Company Swiss Grid.
Lines and construction
The total route of Mettlenstrasse at Inwil to Lavorgo. On the 52 km long section to Amsteg usually the Gotthard line runs parallel to it. Between Mettlenstrasse and Amsteg three circuits are mounted on the same poles, forming the sub-station Amsteg. From Amsteg the Lukmanier line goes her own way. It follows the Surselva and crosses this valley, in front of the Rhine flows between Disentis and the Tavetsch. Under it is a substation of the power plants Anterior Rhine, with which it is not connected.
There are more than 160 towers in use: With the station Mettlenstrasse some Danube masts and then to Amsteg exclusively tons poles, mostly in the Central Swiss power plants (CKW ) typical design. At the height of the Erstfeld tons masts are identical to the 380 kV suspension towers of Axpo AG, a partner company of the CHC. For the 53 -kilometer line section between Amsteg and Lavorgo over the Lukmanierpass 145 lattice masts ( poles Delta ) were built for a circuit in a level arrangement. Their average height is 30 meters.
The average span of the line is 350 meters, the largest span between two masts 890 meters. As head of twos and threes bundle of Aldrey come with a cross section of 550 mm ² for use. The diameter of each part of the rope is 30.5 mm. As OPGW two steel cables with a diameter of 11.5 mm and a cross section of 80 mm ².
The 46 ° 34'21 " north latitude and 8 ° 47'23 " east Länge46.57258.7897222222222 located Abspannmast in the lake of Santa Maria ( Romansh: Lai da Sontga Maria ) is a 75 meters high tension tower, in the 28 meters high concrete bases the flooding of the dam in the Swiss canton of Grisons is. It was built in 1949 as a normal Abspannmast. During the construction of the dam of Santa Maria In 1957 he was set to today's 28 -meter-high concrete base that protects its construction before the waters of the lake and the floating ice in the winter.
Use history and development
The Lukmanier line was completed in 1949 as the second North-South transversal of the Aare -Tessin Ltd. for Electricity. It was initially operated with a voltage of 220 kV.
On 25 February 1999, the line in the lower part of the Val Medel was damaged over a length of approximately 500 meters by a snow avalanche, with a mast was knocked down.
On 28 September 2003 in the municipality of Ingenbohl a momentous incident occurred in the area Schränggigen. An arc spanned between the line and a pine tree. The associated loss of Lukmanier line led to several chain reactions, which had a total power failure throughout Italy consequence. In Switzerland, the Ticino, the Misox and the Upper Engadine were together with the City of Geneva affected by the power outage ..
From 2003 to 2009, led Alpiq (formerly Atel) by together with Swiss Grid at the Lukmanier line a field test for Line Monitoring ( FLM ). Here at the three measurement stations Erstfeld, Rueras and Cugnasco different FLM methods were tested. The decisive factor for the selection of the Lukmanier line for trying their course was ( temperate, alpine and Mediterranean ) by three different climate zones, since the overhead line monitoring increases the transmission capacity of overhead lines, taking advantage of the climatic conditions.
Since January 3, 2013, the entire line as the Swiss high-voltage grid owned by the Swiss Grid, which had taken over the operation a few years earlier.
The masts of the Lukmanier line are due to their advanced age especially susceptible to corrosion. As a result, sees today's energy operator of the street, the Aare -Tessin Ltd. for Electricity prompted to replace the existing structures with new, now -standard masts.
The 380 kV circuit, the Lucamagno line ended in 2006 provisionally sub-station of Amsteg. The section in the Reuss Valley and the Lake of Uri was partially developed for 400 kV. The new 400 kV structures are identical to the 380 kV poles of the NOK. Also 17 poles were replaced between Sisikon and Ingenbohl Between May and October 2006. Further expansion phases are planned.