Lünerseewerk

Lünerseewerk
Latschau II reservoir with the Lünerseewerk behind it. It is currently in turbine operation, as can be seen from the water outlet from the two openings in the left half of the picture.
location
Coordinates	47 ° 4 '26 "  N , 9 ° 52' 27"  E Coordinates: 47 ° 4 '26 "  N , 9 ° 52' 27"  E
country	Austria  Vorarlberg
place	Tschagguns
Waters	Lünersee , Latschau reservoir
power plant
owner	illwerke vkw AG
operator	illwerke vkw AG
construction time	1954-1958
Start of operation	1958
technology
Bottleneck performance	229 (before the renovation) megawatts
Average height of fall	Max. 974 m
Standard work capacity	371 million kWh / year
Turbines	5
Generators	5
Others
Website	www.illwerkevkw.at

Power plant group Obere Ill-Lünersee Schematic representation

Transfer from the Brandner Glacier 2480  m above sea level A. Ill origin ( Ochsentaler Glacier ) 2460  m Tributaries Silvretta reservoir 2030  m Drain to Ill  |  Lünersee 1970  m Tributaries Kleinvermunt pumping station 1670  m Stream crossing Fasulbach and Rosanna Kops reservoir 1809  m Obervermuntwerk I 1743  m Transfer Kops-Vermunt with tributaries Tributaries Vermuntsee 1743  m Lockroom salonies 1690  m Obervermuntwerk II 1655  m Rells-, Vilifau- and Zaluandabach tributaries Storage basin rells 1456  m Rellswerk 1430  m Kopswerk II   |   Kopswerk  I   |   Vermuntwerk 1025  m Partenen compensation pool 1025  m Free-flow tunnel Partenen-Latschau Rifawerk 1005  m Rifa compensation pool 1007  m Tributaries Garnera, Vermilbach, Suggadin Lünerseewerk 992  m Latschau reservoir 992  m Latschauwerk 985  m Rodundwerk I   |   Rodundwerk II 645  m Inflow from Ill Rodund basin  I to III 645  m Drain to Ill Alvier tributary Inflow quantity Walgauwerk 492  m Walgau compensation basin 492  m Drain to Ill

The Lünerseewerk is a pumped storage power plant and one of the numerous electricity plants operated by illwerke vkw AG in the Austrian Montafon .

Lünerseewerk

The plant, which was built between 1954 and 1958, is located in Latschau above Tschagguns and is fed from the Lünersee, which is 974 meters higher (in the case of full damming), via tunnels and pressure pipes. Although only five of the six originally planned machine sets were built, it was the most powerful pumped storage power plant in the world at the time of its completion.

The water is then collected in the Latschau reservoir and from there passed on to the Rodundwerk . The Lünerseewerk can pump water from the Partenen – Latschau headwaters into the Lünersee, as can water that is pumped from the Rodundwerk into the Latschau reservoir. Water from the Rellsbach is also fed into the Latschauer Basin (see picture, water inflow to the right of the middle). In the Latschau II basin there is still the Latschauwerk , a small, separate run-of-river power plant. The Latschau II basin was renovated in spring and summer 2011. Around 12,000 m³ of silt masses (sand and mud) were removed and around 100,000 square meters of new sealing material were applied. Latschau I followed two years later. The machine sets of the Lünerseewerk were completely renovated from 2013 to 2015.

Technical specifications

The Lünerseewerk power plant consists of the Lünersee reservoir, the headrace system with an inlet structure, the lake tunnel, the Lünersee barrier chamber, a relief shaft, the pressure tunnel from Lünersee to Salonien, the Taldüker Salonien, the pressure tunnel from Salonien to Grüneck, the Grüneck moated castle, the armored tunnel from Grüneck to the Grüneck barrier chamber, the Grüneck barrier chamber, a pressure pipeline and a pressure shaft, the power house, the underwater channel and the pump water channel and the forepump basin.

Power house

The Lünerseewerk itself is a free-standing, 120 m long power house with five vertical-axis machine groups, each (from top to bottom) consisting of an exciter, motor generator, four-nozzle free-jet turbine, hydraulic synchronizing converter with tooth clutch and five-stage, single-flow storage pump. The machine sets are over 30 m high. Most of them are below the level of the machine hall floor, only the excitation machines, motor generators and water supply lines are visible in the hall.

Before the refurbishment, the power plant had a bottleneck output of 229  megawatts (MW) and an absorbed motor output in pumping mode of 224 MW. The standard work capacity is 371  GWh ; In 2012, 378 GWh were generated. Around 40 changes between pump and turbine operation take place every day.

• Nominal output per turbine 46.2 MW
• Recorded Engine output per machine unit in pump operation 43 MW
• Flow rate per turbine 5.52 m ³ / s; Officially approved total turbine flow rate 32 m ³ / s
• Flow rate per storage pump 4.24 m ³ / s; Officially approved pump flow rate 28 m ³ / s.
• Crude fall height 974 m
• Exit speed of the water from the nozzles: approx. 500 km / h
• Speed ​​750 min ⁻¹
• Nominal power per motor generator 56 MVA
• Transmission power per hydraulic synchronizing converter 23.6 MW
• Generator - rated voltage of 10.5 kV
• 5 block transformers 10.5 / 240 kV, each 56 MVA for the machine sets
• 220 kV outdoor switchgear next to the power house
• 1 house generator with a nominal output of 2.2 MVA

Hydraulic data

• Water level of the Latschau compensation basin at full water level: 992.25 m
• Standard energy from inflow and annual pump storage per year: 170 million kWh
• Standard working capacity from storage pumps for the rotary pump per year: 201 million kWh
• Maximum daily storage level lowering with full load turbine operation of the Lünerseewerk with 5 machines: -4.0 m / day
• Maximum daily storage level increase with full load pumping operation of the Lünerseewerk with 5 machines: +3.3 m / day
• Headrace: total length 9745 m consisting of
  • 2 pressure tunnels length 3056 and 2474 m, together 5530 m, inner diameter 3.05 m
  • Armored valley culvert , length 1336 m, inner diameter 2.60 to 2.40 m
  • Downpipe, consisting of: armored tunnel length 482 m, inner diameter 3.20 m
    • Pressure pipeline, length 1050 m, inner diameter 2.25 m
    • Pressure shaft, length 917 m, inner diameter 2.15 m
    • Flat section, length 430 m, inner diameter 2.05 m
    • Test pressure of the line near the branch to the first turbine: 190 bar

The water level of the Latschau II basin is often too low to guarantee a continuous and bubble-free flow of water to the pumps of the Lünerseewerk. This is why the forepump basin is located on the side of the machine hall facing away from the Latschau II basin (water level constant at around 1004 m above sea level). Water from the Latschau II basin is first pumped up into the forepump basin. From there, it can flow in a stable flow with a slight overpressure (approx. 2 bar) to the pumps of the five machine sets. The backing pumps are driven with water under enormous pressure from the Lünersee – Lünerseewerk pipeline.

The machine hall is equipped with two bridge cranes, each with a load capacity of 60 t. With the help of a crossbeam, both cranes can lift the heaviest part of each machine set, the 110-ton generator rotor.

The Lünerseewerk is usually unmanned at night and then works automatically. Other illwerke vkw power plants can be remotely controlled from his control room. Due to its location, it is relatively protected from flooding. On the other hand, the control room of the Rodundwerke in the valley could fail if a dam breaks.

The energy is transported via a 220 kV overhead line from / to the Bürs substation .

The Lünerseewerk operates the “showroom” in its rooms, an exhibition about the function of the plant and the other illwerke-vkw power plants, about the geology of the Rätikon and more. The machine hall is inaccessible unaccompanied, but can be viewed through panoramic windows. The showroom is open daily from 8 a.m. to 6 p.m., admission is free. Guided tours can also be booked.

Rellswerk

The Lünersee

Between 2014 and 2018, another pumped storage plant, the Rellswerk , was built below the Rellser Mariahilfkapelle in the Rellstal , which also collects the water from the upper Rellsbach and is connected to the Lünersee – Lünerseewerk pipeline in the Salonie Alps area. It was put into operation on September 28, 2018.

As a result, the inflow to the Lünersee increased by around 17 million m³ / year from 2018, which enabled primary energy generation to be increased by around 16 GWh / year. For the provision of peak and balancing energy by the Lünerseewerk, this means an additional annual production of at least 37 GWh / year.

literature

• Guntram Innerhofer: Lünerseewerk. Construction of the pressure shaft. In: Österreichische Wasserwirtschaft 13, Vienna 1961, pp. 169–175.

Web links

Commons : Lünerseewerk  - collection of images, videos and audio files

• Lünerseewerk - illwerkevkw.at
• VIDEO vorarlberg-from-above to Latschau 1 min

Individual evidence

1. ↑ Information column of the Vorarlberger Illwerke am Lünersee, at the mountain station of the Lünerseebahn
2. ↑ Final touches for "Latschau II"
3. ↑ Illwerke Magazin, issue 27, October 2013, p. 10 ff.
4. ↑ Literally quoted from http://cdn2.vol.at/2010/02/Rellswerk_UVP.pdf ENVIRONMENTAL COMPATIBILITY TEST Rellswerk Vorarlberger Illwerke AG, p. 14.
5. ↑ Illwerke Magazin, Issue 27, October 2013, p. 10.
6. ↑ ^{a b} Guided tour of the Lünerseewerk, 2014
7. ↑ decision Zl.96110 / 33-71916 / 54 of the Ministry of Agriculture and Forestry of 14 October 1954 for the Lünerseewerk - increasing the design flow
8. ↑ Signs for Latschauwerk.
9. ↑ Information as per ENVIRONMENTAL COMPATIBILITY TEST Rellswerk Vorarlberger Illwerke AG , p. 15.
10. ^ Exhibition in the showroom of the Lünerseewerk
11. ↑ Lünerseewerk showroom. Retrieved March 9, 2019 (Austrian German). 
12. ↑ ENVIRONMENTAL COMPATIBILITY TEST Rellswerk - Vorarlberger Illwerke AG
13. ^ Project Rellswerk
14. ↑ Illwerke / VKW puts Rellswerk into operation on ORF-Vorarlberg from September 28, 2018, accessed on September 28, 2018
15. ↑ Source: paid service by the Illwerke VKW Group on May 23, 2014 in Vorarlberger Nachrichten , supplement p. 8.