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Reduction of peak dynamic loads on pumping units of main canal stations
Conclusions 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. 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. 3. The proposed method of reducing peak loads solves difficulties related with transients at large pumping stations of water-transfer systems.
Reduction of peak dynamic loads on pumping units of main canal stations
Conclusions 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. 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. 3. The proposed method of reducing peak loads solves difficulties related with transients at large pumping stations of water-transfer systems.
Reduction of peak dynamic loads on pumping units of main canal stations
Karelin, V. Ya. (author) / Novoderezhkin, R. A. (author) / Borovykh, V. N. (author) / D'yakonov, H. V. (author) / Kuksov, G. P. (author) / Chirkov, P. P. (author)
Hydrotechnical Construction ; 19 ; 399-403
1985-08-01
5 pages
Article (Journal)
Electronic Resource
English
Reduction of peak dynamic loads on pumping units of main canal stations
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