Conclusions
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1.
The method of dynamic braking is recommended for reducing peak dynamic loads when stopping axial- and diagonal-flow pumps at stations of main canals. This method makes it possible with insignificant additional equipment to completely eliminate the most dangerous regime of stopping overspeeding — and to keel the pump in the optimal zone of the turbine regime, the loads in which are less than the corresponding loads in the working pump regimes.
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2.
As a result of investigating dynamic braking, data were obtained which characterized this method both from the viewpoint of a change in the electrical and in the hydromechanical parameters of the pumping unit. The optimal exciting current of the rotor is I *r =0.4–0.6, in which case a current I *st =0.6–0.8 is induced in the stator. Vibrations are reduced by threefold and pressure fluctuations by 2–2.5 times. Reversing of the hydrodynamic moment on the pump vanes is eliminated.
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3.
The proposed method of reducing peak loads solves difficulties related with transients at large pumping stations of water-transfer systems.
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Literature cited
V. Ya. Karelin and R. A. Novoderezhkin, Pumping Stations of Hydrotechnical Systems with Axial- and Diagonal-Flow Pumps [in Russian], Énergiya, Moscow (1980).
V. Ya. Karelin, R. A. Novoderezhkin, V. N. Borovykh, and B. P. Titarenko, “Transients in a low-head pumping station with a surface out let,” Gidrotekh. Stroit., No. 8 (1979).
F. A. Abutaliev, M. A. Khusanov, and A. D. Dodarianov, “Electrical methods of braking pumping units after their disconnection,” Tr. Sredazgiprovodkhlopok, No. 8 (1975).
Additional information
Translated from Gidrotekhnicheskoe Stroitel'stvo, No. 8, pp. 16–19, August, 1985.
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Karelin, V.Y., Novoderezhkin, R.A., Borovykh, V.N. et al. Reduction of peak dynamic loads on pumping units of main canal stations. Hydrotechnical Construction 19, 399–403 (1985). https://doi.org/10.1007/BF01439553
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DOI: https://doi.org/10.1007/BF01439553