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Steinau an der Straße, Germany

Richter W.,University of Graz | Schneider J.,University of Graz | Zenz G.,University of Graz | Kolb S.,Schluchseewerk AG
WasserWirtschaft | Year: 2012

Increased flexibility for pumped hydro schemes with high discharge rates requires an optimized surge tank design. The objective of the surge tank layout is to protect the pressure tunnel from water hammer propagation and reduce mass oscillation due operational needs. In past decades surge tanks became more and more sophisticated to fulfill technical as well as economic aspects. Therefore the design of chamber surge tanks has been adapted with throttles and overflows to make use of differential effects. These are initiated during down-surge by water column separation. In the main shaft the water column is dropping though water still remains in the upper chamber which causes high air entrainment. It is important to avoid the transport of air into the pressure tunnel. The optimization of a large surge tank based on physical model tests supported by 3D-numerical calculations is demonstrated.

The plant has been erected at the left (swiss) embankment of the Rhine River. Power transfer cables, transformer and the connection to the grid are placed at the German side. The ground was geologically well known since the erection of the barrage in the thirties of the last century. The foundation of the turbine house is situated in a so called wave-limestone bank which is a kind of dolomite. Special investigations with focus on the pollution of the underground showed a local contamination of chromate, caused by the former erection of the barrage. 3 000 m 3 of contaminated material has been transferred to a specialized waste disposal site. A total amount of 210 000 m 3 material has been excavated, 93 000 m 3 could be reinstalled at site. To complete the concrete structure about 500 concreting steps were necessary, handling 39 000 m 3 of concrete with 3 800 tons of reinforcement iron.

An intensive increase in generation of renewable energy Is needed urgently to achieve the climate change objectives set by the government of Germany. Since renewable energies are subject to strong fluctuations, regulatory accumulators such as the pump storage plant Atdorf are necessary. Through the construction of Atdorf, Schluchseewerk AG invests in protection of the climate and in increased security of supply.

Mohringer T.,Karlsruhe Institute of Technology | Riesterer J.,Karlsruhe Institute of Technology | Kolb S.,Schluchseewerk AG | Nestmann F.,Karlsruhe Institute of Technology
WasserWirtschaft | Year: 2013

Germans most powerful pumped storage plant is projected by Schluchseewerk AG in the southern black forest, Germany. At the Institute for Water and River Basin Management of the Karlsruhe Institute of Technology the intake and outlet structure in the lower basin of the pumped storage plant has been optimized using composite modelling techniques. Extensive comparisons between the numerical and the physical scaled model have been conducted and the scaling effects from the model scale to the full scale have been evaluated. The result of the optimization is a hydraulic structure of small dimensions and excellent hydraulic characteristics.

Rieckmann G.,Fachbauleiter Elektrotechnik und Leiter Inbetriebnahme WKW | Kolb S.,Schluchseewerk AG | Merkle D.,Schluchseewerk AG
WasserWirtschaft | Year: 2010

The generator's 10,5 kV voltage cables (4 systems) are crossing the river Rhine, being connected to a 10,5/116 kV transformer situated on the German embankment. The electricity production of the new generator is supplied to the connection station in the old powerhouse, using an aluminium cable with a length of 3,5 km at a voltage level of 110 kV. Because the cable-way is rather straight, individual cable segments of a length of about 1.200 m each could be pulled. The internal power consumption is secured by 4 redundancies: 400 V supply from the low voltage distribution of the weir, 10 kV supply from the turbine system resp. 10 kV grid, 16 kV supply from the Swiss grid and an emergency diesel motor which is stand by for the weir.

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