Obervermuntwerk

Obervermuntwerk
The Vermuntsee with the Obervermuntwerk on the right edge of the picture
location
Coordinates	46 ° 55 '37 "  N , 10 ° 3' 13"  E Coordinates: 46 ° 55 '37 "  N , 10 ° 3' 13"  E
country	Austria  Vorarlberg
place	Gaschurn
Waters	Ill
Height upstream	2030  m above sea level A.
power plant
owner	illwerke vkw AG
operator	illwerke vkw AG
construction time	from 1938
Start of operation	1943
technology
Bottleneck performance	29 megawatts
Average height of fall	287 m
Standard work capacity	45 million kWh / year
Turbines	2 Francis spiral turbines each 18.1 MW
Generators	Three-phase generators each 19 MVA
Others
Website	www.illwerkevkw.at

The Obervermuntwerk (OVW) (now number I) is a high-pressure storage power plant operated by illwerke vkw AG on Lake Vermunt in the Austrian state of Vorarlberg . It is part of the Obere Ill-Lünersee power plant group.

Former above-ground pressure pipeline from the Silvretta reservoir to Obervermuntwerk I

Dismantling of the disused penstock in July 2020.

At 1743  m above sea level A. Lying on the banks of the Vermuntsee in the municipality of Gaschurn , the power plant uses the height difference of 287 m to the Silvretta reservoir above to generate electrical energy . The power plant has a bottleneck capacity of 29  megawatts and a standard work capacity (average annual energy production) of 45  GWh .

history

The construction of the Obervermuntwerk (I) began in 1938. Five years later, in 1943, the power plant was put into operation. At that time, the 19 MVA three-phase generators were the largest hydropower generators manufactured in Austria.

Since the Obervermuntwerk II went into operation in 2019, it and the Obervermuntwerk I have been connected to the Silvretta reservoir via a joint, newly constructed pressure tunnel. The dismantling of the old above-ground pressure pipeline therefore began in summer 2020.

technology

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

A 3.27 km long, above-ground pressure pipeline with an inner diameter of 2.40 to 2.10 meters led from the Silvretta reservoir ( 2030  m above sea level ) to the power house.

The power plant has two vertical-axis machine groups. Each machine group consists of a Francis spiral turbine , pressure regulator and three-phase generator . With a flow rate of 7 m ³ / s, a raw head of 291 m and a speed of 600 min ^−1, each turbine generates a nominal output of 18.1 MW. The generators have a nominal voltage of 6 kV and a nominal power of 19 MVA.

The turbine bottleneck capacity of the OVW is 29 MW, these have an annual working capacity of around 45 million kWh (primary energy).

The voltage of the generators is converted to 20 kV via block transformers. The power plant is connected to the power grid on the 20 kV level via an indoor switchgear . The energy is transported to Trominier by underground cable, from there to the Vermuntwerk substation by overhead line . A house transformer with an output of 0.15 MVA is available for self-supply.

Web links

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

Commons : Vermuntsee  - Collection of images, videos and audio files

• Obervermuntwerk I - illwerkevkw.at