Oldau barrage

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Oldau barrage
Barrage with hydroelectric power station (right) and sluice (left)
Barrage with hydroelectric power station (right) and sluice (left)
location
Oldau barrage (Lower Saxony)
Oldau barrage
Coordinates 52 ° 39 '32 "  N , 9 ° 56' 12"  E Coordinates: 52 ° 39 '32 "  N , 9 ° 56' 12"  E
country GermanyGermany Germany
Lower SaxonyLower Saxony Lower Saxony
place Oldau , district of Celle
Waters All
Kilometers of water km 14.7
f1
power plant
operator Aller-Wasserkraft-E-Werk Oldau GmbH & Co. KG
Start of operation 1911
Shutdown 1972-1982
Listed since 1974
technology
Bottleneck performance 0.65 megawatts
Average
height of fall 		4.0 m
Turbines 3 Francis turbines
Others
was standing 2015

The Oldau barrage near Hambühren in the district of Celle is one of four barrages in the Aller , a tributary of the Weser . It consists of a weir and a listed hydroelectric power station in an all loop and a lock in the immediate vicinity in the lock canal.

history

The four barrages of the Aller are all between the confluence of the Leine in the Aller and the city of Celle . These are the Hademstorf barrage , the Marklendorf barrage , the Bannetze barrage and the Oldau barrage, which is located furthest upstream.

At the end of the 19th century, the oil and potash industry developed on the Aller. In 1903, at the instigation of Bremen merchants, a preliminary draft was drawn up for the regulation of the Aller in the Lüneburg administrative district, which aimed to improve the fairway conditions on the Aller. In addition, the port in Celle was built in 1904. In 1908, the Prussian state government decided to canalize the Aller from the mouth of the Lein to Celle with four barrages and, below the mouth of the Lein, in the area of ​​the free-flowing route, to regulate the Aller by means of electricity construction measures , such as the construction of groynes and tail units , in order to improve the connection to the Bremen ports to reach a minimum water depth of 1.50 m at medium low water. Construction work began in 1909 and dragged on until 1918 due to the war. The locks in Oldau, Bannetze, Marklendorf and Hademstorf were for the then prevailing Schleppzugschifffahrt m with a useful length of 165, at a threshold depth adapted m of 2.50.

The municipal electricity works in Celle decided to build a hydroelectric power station in May 1905. A contract was concluded with four companies in the Wietz oil region and the city of Celle, which obliged the companies to gradually purchase all of their electricity requirements from the contract partner. As a result, the construction of the power plant in Oldau began in 1908. The electricity should be generated with water turbines , but because of the often changing water levels, it should also be generated independently with steam turbines . The first two high-voltage lines from Oldau to Hornbostel and Marklendorf conducted electrical energy into the oil area from May 19, 1909. In the following months, private customers in Wietze and Steinförde were also connected to the network.

Weir

Hydroelectric power station with weir

The weir was built between 1908 and 1910. It is 30 m wide with two weir fields each 15 m wide. The water level is 3.80 m. The weir is operated by the Verden Waterways and Shipping Office .

power plant

At the same time, a coal-fired steam power plant was built, which was demolished again in the 1930s. Construction of the run- of -river power plant began as early as 1910, and went into operation in 1911 with an output of 300 kW and a maximum output of 420 kW. Initially, the hydropower plant was operated with a high-voltage generator , later with a low-voltage generator with a speed of 1500 / min. In 1926 the city of Celle sold the hydropower plant to the PreussenElektra company . It was shut down in 1972 because of excessively high personnel and repair costs, and in 1974 it was saved from demolition by an order of the district president in Lüneburg and declared a technical monument .

The three Francis shaft turbines have been running again since 1982 , each offset by 30 cm so that they can work when the water level changes. The turbines are connected in series and drive the generator shaft via bell-shaped wooden comb wheels. The drop height is 4.0 m. The output of the hydropower plant has been increased to 650 kW through the installation of a computer-controlled, hydraulic guide vane adjustment. Thanks to automation and monitoring systems, the power plant is now working economically again. The operator is Aller-Wasserkraft-E-Werk Oldau GmbH & Co. KG.

lock

Oldau lock

At the same time as the weir, an approximately 400 m long canal with a sluice for tug shipping was created for shipping. Since commercial shipping has not been operated on the Aller since 1969, the lock is only relevant for pleasure craft and passenger shipping today. Vehicles up to 55 m in length, 6.60 m in width and a water-level-dependent draft up to a maximum load capacity of 650 t are permitted as federal waterways of waterway class II (type ship Kempenaar) or according to the inland waterway regulations.

The lock is in the Aller lock canal at km 0.36. The usable length of the lock is 159 m, the usable width 10.00 m. The maximum lifting height is 3.18 m. Like the weir, the lock is operated by the Verden Waterways and Shipping Authority.

Web links

Commons : Barrage Oldau  - collection of images, videos and audio files

Individual evidence

  1. ^ WSA Verden: Structures , accessed on September 29, 2015.
  2. ↑ a b WSA Verden: Die Aller - a shipping route , accessed on September 29, 2015.
  3. ↑ Oldau hydropower plant ( Memento of the original from September 30, 2015 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. at www.erdoelmuseum.de, accessed on September 29, 2015 @1@ 2Template: Webachiv / IABot / www.erdoelmuseum.de
  4. ↑ WSA Verden: Wehr Oldau: Technical data , accessed on September 29, 2015.
  5. ↑ History hydroelectric plant Oldau on www.hambuehren.de, accessed on September 29, 2015
  6. ↑ WSA Verden: Oldau lock: Technical data , accessed on September 29, 2015.