St. Anton hydropower plant
| Hydroelectric power station St. Anton Centrale idroelelettrica Sant'Antonio |
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| Coordinates | 46 ° 30 '48 " N , 11 ° 21' 23" E | ||
| country | Italy | ||
| Waters | Reservoir Wangen | ||
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| Primary energy | Hydropower | ||
| power | 90 MW | ||
| operator | Eisackwerk GmbH, Bolzano | ||
| Start of operations | 1951 and 2019 | ||
| turbine | 3 × Pelton turbines à 30 MW with 4 nozzles | ||
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The St. Anton hydropower plant (in Italian, Centrale idroelelettrica Sant'Antonio ) is located at the exit of the Sarntal valley in the municipality of Ritten near Bozen and is used to generate control power . The power plant generates max. 90 MW and a total annual output of around 300 GWh. St. Anton uses the water from the Talfer river , which is stored in the Wangen reservoir near Oberinn am Ritten . Eisackwerk GmbH has been the operator since 2015.
location
The original machine house (until the redesign of the power plant in 2018/19) is located directly on the left bank of the Talfer, a little above the valley station of the Jenesien cable car . The newly designed power plant is completely located in caverns in the Bolzano Porphyry Mountains , behind the previous machine house, and can only be recognized by the transformer station.
history
The machine hall from 1951 was relocated between 2018 and 2019 in caverns in the porphyry rock behind the previous machine house. The previous technology was completely replaced by new systems. At the same time, a buffer basin was created in the mountain to moderate dangerous floods in the Talfer. The current power plant has been on the grid since May 2019.
History of the power plant until 2019
The first St. Anton power plant was built in 1951 with 3 turbines in the machine house directly on the Talfer. The 3 turbines delivered max. 72 MW output and up to 270 GWh electricity per year. The production of this first power plant was stopped in January 2019. In 2015 Eisackwerk Srl (GmbH) took over the St. Anton power plant from SE Hydropower.
Accidents in the Talfer due to surge water
In the St. Anton power plant, splashing water when the turbines started up put those looking for relaxation at risk on the Talferwiesen below, where people repeatedly step onto the Talfer bed and more than 20 fatal accidents occurred.
Renovation 2018-2019
Between 2018 and 2019, the complete equipment of the turbine building were replaced by new ones and about a so laid in three newly-dug caverns km in the Bolzano porphyry rock behind the turbine house that the pressure pipe from the water tower could be installed perpendicular to the turbines. The shaft for this was newly drilled ( raise-boring method ). In addition to increasing turbine output and annual electricity generation, the aim of the renovation was to moderate the dangerous surge water that had occurred in the Talfer in the past.
technology
Height of fall
The water flows from the Wangen reservoir through tunnels to the moated castle. From there it falls 595 m through the pressure pipe (Ø 2.20 m) vertically into the cavern for distribution to the 3 turbines.
Machine hall
The entire turbine hall - as well as the moderation basin as a buffer for the turbined water - is housed in 3 caverns about one km in the mountains. The caverns are accessed via two 300 m long access tunnels. Its entrance is near the turbine house from 1951.
Turbine technology
The 3 vertical-axis Pelton turbines come from Troyer AG in Sterzing and each have an output of 30 MW. These are 4-nozzle turbines with brake nozzles and a vertical axis. The impellers were milled from a monoblock of steel and have a diameter of 2080 mm with 19 blades each (buckets). The water jet from the 4 nozzles reaches 385 km / h with a flow rate of 6 m³ / s per turbine. The synchronous generators are located above the impellers and have a speed of 600 rpm. The system control also comes from Troyer AG.
The buffer or moderation pool
The moderation pool is housed in a special, 900 m long and up to 15 m wide cavern and holds 95,000 m³ at 8.1 m water level.
Network connection
The generated electric current is led out of the mountain at 13,800 volts and outside of it is increased to 220 kV.
Water intake and reservoir Wangen
The water intake on the Talfer is about 2 km below Sarnthein near Bad Schörgau. The supply line to the Wangen reservoir leads approx. 10 km through a tunnel in the eastern slope of the Sarntal, crosses the Tanzbachtal via an aqueduct and has access from the Sarntal-Wangen road.
Shortly after the water catchment, the Sarnthein hydropower plant in Bundschen feeds the water from its turbines into the supply tunnel. The water from the Tanzbachtal also flows into the tunnel.
The Wangen reservoir has an arch dam with a wall crown at a height of 919 m and holds around 350,000 m³, of which 320,000 m³ can be used to generate electricity.
At the Wangen reservoir, the water from the supply tunnel can be channeled over an arched bridge over the reservoir and thus past it.
Mühlbach hydropower plant
In 2012 the Eisackwerke also rebuilt the Mühlbach hydropower plant in the lower Puster Valley with the same concept, machine house in a cavern and vertical pressure pipeline. 4-nozzle Pelton turbines from Troyer AG are also installed in Mühlbach.
See also
Web links
Individual evidence
- ↑ a b c d Jörn, Fritz: Sankt Anton power plant in Bozen, 600 meters in the free waterfall , Frankfurter Allgemeine Zeitung , February 3, 2018. accessed on February 11, 2019
- ↑ St. Anton power plant will be taken off the grid . Rainews.it. January 2019, accessed April 26, 2019
- ↑ St. Anton power plant: State government cancels SEL concession , stol.it, February 2015, accessed on April 25, 2019
- ↑ a b c d e f g E-Werk St. Anton - How a power plant infrastructure disappears in the mountain . zek Hydro, specialist magazine for hydropower: 16th year, August 2018
- ↑ Vibrierende Weinglasses , Daily Newspaper Online, April 10, 2017. Accessed on February 28, 2019
- ↑ Aqueduct of the supply line to the Wangen reservoir via the Tanzbach on Google Maps .