Iller dam 7 - Maria Steinbach

Iller dam 7 - Maria Steinbach
View from underwater
location
Coordinates	47 ° 53 '44 "  N , 10 ° 8' 29"  E Coordinates: 47 ° 53 '44 "  N , 10 ° 8' 29"  E
country	Germany
place	Maria Steinbach
Waters	Iller
Kilometers of water	km 65
Height upstream	612  m above sea level NHN
power plant
operator	Lechwerke
construction time	1937-1938
Start of operation	1938
technology
Bottleneck performance	6.0 megawatts
Average height of fall	8.1 m
Expansion flow	100 m³ / s
Standard work capacity	24.5 million kWh / year
Turbines	4 Strafloturbines
Generators	4 outer rim generators
Others
was standing	2019

The Iller barrage 7 - Maria Steinbach is a barrage of the Iller between Kempten and Memmingen at river kilometer 65. It is located in the municipality of Kronburg in the district of Unterallgäu .

history

When the first underwater power plant based on the first Arno Fischer construction method was successfully completed on the Persante near Rostin in 1936 , further locations were sought for the concept. Finally, in 1937, the Maria Steinbach power plant was the first to be built using the second Arno Fischer method; 14 of the more than 60 planned power plants were built, 13 are still in operation at Iller and Lech . On July 11, 1938, the Maria Steinbach stage went online for the first time. The advantage of the execution was the camouflage , which was important for the war effort , the few roof areas were greened and the power plant 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, level 6, level 5 in 1944 and level 8 in 1948, based on the same design, went into operation.

The power plant has a fish ladder .

The operator is Bayerische Elektrizitätswerke GmbH, a subsidiary of Lechwerke AG .

technology

The generated output of the Iller dam 7 is 6.0 MW with a drop height of 8.1 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 body .

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 . The problem is the sealing of the bulb turbines to the generators, as well as the practical impossibility of adjusting the impeller. 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 24,500 MWh per year.

See also: List of hydropower plants in Germany

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. ↑ Continuity: fish ladders and hiking aids on the Iller work. 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 .