Preliminary derivation
Map with all coordinates of the preliminary derivation: OSM 
 
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Substations |
The upstream line (named after the glacier or Berg Vorab) or 380/220 kV line Tavanasa – Grynau – Breite is a 103-kilometer high-voltage line in Switzerland . It begins at the Tavanasa / Obersaxen power plant belonging to the Vorderrhein power plant and ends in the Breite substation near Birchwil . It leads through the cantons of Graubünden , Glarus , St. Gallen and Zurich . As in the entire Swiss extra-high voltage network, the line is operated by Swissgrid AG.
Route
The line begins in the switchboard of the power plant Obersaxen / Tavanasa of power plants Vorderrhein AG , the Vorderrhein in the Swiss canton of Grisons . It leads with two electric circuits (one of which is 220 kV and one 380 kV), initially above the Surselva and then northwards. The plateau of the Vorab glacier is affected. With a maximum height of 2720 m above sea level. M. it forms the highest overhead line in Europe. After the border to the canton of Glarus has been crossed, the circuits are divided into two separate lines that are laid on delta masts . The 32-meter-high guy masts erected a little to the north in 1961 are inclined by 18 degrees to the vertical in order to be able to support the resultant of the tensile forces of the 2 neighboring fields without bending moment in the mast. The tension of the section over the steep step (Schwarz Wändli in the direction of the Martinsmadhütte ) is mainly borne by the pair of masts above. The line descends on these masts into the Sernftal and crosses it to the vicinity of Schwanden , where a double-circuit 380 kV line branches off and leads to a newly constructed switchgear of the Linth-Limmern power station.
On the eastern slope of the valley, the 220 kV line from the Linthal power plant to Grynau runs parallel to the preliminary discharge. After the crossing of the Escher channel and descent in the Linthebene perform parallel addition, the 380 kV line Bonaduz width, the 380/220-kV line Sils in Domleschg - Faellanden and some lines of the distribution network, said first-mentioned means of a Donau masts will pass under. These lines run parallel to the Biberlichopf and the canalized Linth to the Grynau substation near Uznach in the canton of St. Gallen. Only the 220 kV circuit is connected to this, as there is no 380 kV system.
In the canton of Zurich , the line crosses the Zurich Oberland and from Bäretswil runs parallel to the 380 kV line coming from Bonaduz, which also ends in the Breite substation. From there, a double-circuit 380 kV line continues to the Laufenburg substation .
photos
The preliminary discharge above the black wall divided into two lanes ...
... on the right the last single mast before the division. The inclination of the two guy masts is clearly visible.
The line (far left) just before the Breite substation near Nürensdorf
Substation width
Coordinates
| Job | Coordinates |
|---|---|
| Vertex | 46 ° 52 '42.9 " N , 009 ° 11' 28.3" E |
| Route separation | 46 ° 52 '46.3 " N , 009 ° 11' 28.9" E |
| 1. Right and left guy masts | 46 ° 52 '55.5 " N , 009 ° 11' 25.1" E ; 46 ° 52 '54.3 " N , 009 ° 11' 21.9" E |
| 2. Right and left guy masts | 46 ° 53 '11.8 " N , 009 ° 11' 14.2" E ; 46 ° 53 '12.1 " N , 009 ° 11' 11.9" E |
| 3. Right and left guy masts | 46 ° 53 '36.6 " N , 009 ° 11' 22.6" E ; 46 ° 53 '35.1 " N , 009 ° 11' 09.9" O |
| Merging | 46 ° 54 '19.9 " N , 009 ° 11' 33.2" E |
history
The preliminary derivation was built from 1960 to 1965 during the construction of the Vorderrhein power plants by the Nordostschweizerische Kraftwerke (NOK). Together with the 380 kV connection between Sils / Tavanasa-Bonaduz-Breite, which was completed on November 20, 1964, it was one of the first 380 kV lines in Switzerland and served as an additional connection between the Grisons power plants and the Zurich metropolitan area. Up until now, electricity has been transported over long distances using 130, 150 and 220 kV lines. However, since the transmission losses with these voltage levels were too high (in 1963/64 they were given as 10% of the total national consumption) and lines with this voltage level had been in operation in the neighboring countries of Switzerland for some time, the decision was made to expand the Swiss extra-high voltage network to 380 kV.
The original plan was not to lead it over the Vorab glacier, but a little further west on the Panixer Pass over the mountain range. However, due to a shooting range, this was not possible and the line was led between Vorab and Piz Grisch over the Alpine ridge.
The Linthal2015 project envisaged expanding the Linth-Limmern power plants to produce 380 kV. A new 380 kV line was therefore built and looped into the preliminary discharge at Schwanden .
Disruptions
In Glarnerland regularly occur Foehn storms . On July 16, 2007, the wind caused two of the six conductor cables to come too close at the level of Sool at the entrance to the Sernftal , resulting in a short circuit with an arc fault .
Web links
Individual evidence
- ^ High-voltage line width - Tavanasa in axpo.ch , accessed on October 26, 2016
- ↑ a b Schweizerische Bauzeitung: Commissioning of the first high-voltage line of 380 kV in Switzerland, p. 96
- ↑ Network connection ( Memento of the original from September 25, 2011 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. in axpo.ch , accessed on February 14, 2011
