Iller dam level 6 - Legau

Iller dam level 6 - Legau
View from the north
location
Coordinates	47 ° 52 '13 "  N , 10 ° 10' 52"  E Coordinates: 47 ° 52 '13 "  N , 10 ° 10' 52"  E
country	Germany
place	Legau
Waters	Iller
Kilometers of water	km 71.2
Height upstream	622  m above sea level NHN
power plant
operator	Lechwerke
Start of operation	1943
technology
Bottleneck performance	6.0 megawatts
Average height of fall	8.2 m
Expansion flow	100 m³ / s
Standard work capacity	25.2 million kWh / year
Turbines	4 Strafloturbines
Generators	4 outer rim generators
Others
was standing	2019

The Iller barrage 6 - Legau is a barrage of the Iller between Kempten and Memmingen and is located at river kilometer 71.2 in the area of ​​the Legau market in the Unterallgäu district .

history

As early as 1937/38, a power plant based on the Arno Fischer design was built on the Iller at Iller level 7 - Maria Steinbach . The advantage of this version was the camouflage , which was important for the war effort , the few roof areas were covered with greenery and the power plant itself could be completely overflown by lowering the dams. The cost savings that were also propagated later turned out to be a miscalculation.

On the Iller, after the Arno Fischer design, level 7 went online in 1938, level 6 in 1943, level 5 in 1944 and level 8 in 1948.

In 2014 a fish ladder was built and in 2015 a lookout tower was built in the underwater area .

The power plant is operated by Lechwerke AG .

technology

The generated output of the Iller dam 6 is 6.0 MW with a drop height of 8.2 meters.

With the Arno Fischer power plant construction , weir and power plant form a common structure, the weir weir has 4 attached flaps and an engine room integrated in the weir .

The power plant has four Strafloturbines arranged in parallel and four machine sets.

Each turbine has a flap in the inlet area and a contactor in the outlet area. These locking mechanisms make it possible to dry the turbines individually for inspection purposes and to walk through them.

The generator is arranged as a watertight encapsulated outer ring generator , the rotor is firmly connected to the impeller . However, the sealing of the bulb turbines to the generators and the practical impossibility of adjusting the impeller are problematic. Rigid propeller impellers are therefore installed in the Arno Fischer design. In principle, this limits the efficiency in the partial load range, but the poor partial load efficiency of the propeller turbines can be compensated relatively well by staggering the machines in operation.

The expansion flow of the power plant is 100 m³ / s, the standard energy 25,200 MWh per year.

See also: List of hydropower plants in Germany

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  Aerial view of the power plant and reservoir

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  Fish ladder from 2014 and observation tower from 2015

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  Retrofitted automatic trash rack cleaning machine

Individual evidence

1. ↑ Martin Gschwandtner: Once upon a time there was a «coal theft» technology under the yoke of the Nazi dictatorship; Arno Fischer and the wrong track of the “underwater power plants” in the period between 1933 and 1945 . GRIN, Munich 2009.
2. ↑ Picture gallery: Opening ceremony: Experience the Iller river basin near Legau - even at a height of 23 meters. Retrieved February 19, 2019 . 
3. ↑ BEW hydropower plants on the Iller. Retrieved February 19, 2019 . 
4. ^ Canaan: The underwater power plant . 1945.
5. ↑ Arno Fischer: Imperial patent 760140 - Floodable river power plants. November 24, 1944, accessed February 19, 2019 . 
6. ↑ Andreas Ringler: Floodable river power plants. 2016, accessed February 19, 2019 . 
7. ↑ Analysis of the use of hydropower in Bavaria. Retrieved January 19, 2019 .