The Design of the Outlet for the New Koepchenwerk Pumpstorage Plant

by Henrich Els, Univ of Technology, Aachen, West Germany,
Eberhard Hartmann, Univ of Technology, Aachen, West Germany,
Gerhard Rouvé, Univ of Technology, Aachen, West Germany,

Document Type: Proceeding Paper

Part of: Water Power '87


The Koepchenwerk Pumpstorage Plant (1930) is going to be replaced by a new plant with a 150 MW Pumpturbine in a shaft. This paper explains the reasons for this replacement and gives a brief description of the new plant. The main subject is a general hydraulic problem of a pump-turbine sitting in a shaft: an S-shaped duct is needed to connect the hydraulic machine with the lower basin. The design of this duct influences the approaching flow conditions at the entrance of the pump. It also determines the flow at the exit to the lower basin in turbine operation. And by these effects, it determines efficiency, availability and the lifetime of the plant. A shape of the duct has to be found which causes a minimum of disturbances in both operating directions, is economically favorable, and fits the local restrictions. For the new Koepchenwerk, a hydraulic model and the LDV measuring technique were used to solve this problem. This paper introduces the measurement results both in turbine and in pumping operation and explains the demands the shape must satisfy.

Subject Headings: Pumping stations | Shafts | Hydraulics | Basins | Hydro power | Hydrologic models | Hydraulic design | Hydraulic models

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