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A specific example demonstrates the aspects of transient processes in hydropower plants with double-regulated turbines. To prevent malfunctioning of the unit blocks of hydropower plants, such as unit throwing up, recommendations are provided on the choice of modes of movement of the regulating unit to reduce the negative axial forces acting on the turbine impeller. [ABSTRACT FROM AUTHOR]

An applied study was carried out to find the optimal design solution for a pressure system with a surge tank of the Bokang-Baling HPP. In the course of the study, universal characteristics of the selected turbine were obtained, and the processes occurring in the turbine and in the surge tank were determined. The selection of the optimal solution for the surge tank was made on the basis of a technical and economic comparison of the options for the selected series of surge tanks. Based on the results of the comparison, an analysis of the results obtained was made and the optimal option was selected from the condition of the smallest volume and the fulfillment of the technical requirements for this design. Recommendations for further research on this issue are given. [ABSTRACT FROM AUTHOR]

The results of studies on closing of the emergency-repair gate of the water intake, taking into account the limitations for the axial force on the runner and the acceleration time are presented. [ABSTRACT FROM AUTHOR]

Full-scale data on the pulsations of pressure and the oscillations of the real power in units of hydraulic power plants are analyzed. The relationships among the low-frequency pressure pulsations, oscillations in the turbine torque, and oscillations in the real power of the generator are established. [ABSTRACT FROM AUTHOR]

The conditions of power control of the hydraulic generating units of pumped-storage hydroelectric power stations with the use of the capabilities of asynchronized synchronous motor generators are considered. Characteristics that relate the size of the permissible surge in load in emergency control with limitations on the permissible deviation of the rotational speed of the hydroelectric generating units are obtained. [ABSTRACT FROM AUTHOR]

Aspects of the startup of pumping units in the cooling and process water supply systems for thermal and nuclear power plants with cooling towers, the startup stages, and the limits imposed on the extreme parameters during transients are discussed. [ABSTRACT FROM AUTHOR]

Possibilities are examined of ensuring stable governing and minimizing the negative governing effect by using a relive valve or a surge tank at a small-scale hydropower plant with a long penstock. [ABSTRACT FROM AUTHOR]

The influence exerted by particular features of the characteristics of high-head pumps-turbines on the occurrence of transitional processes is examined in the conduits at a pumped-storage power plant (PSPP). It is demonstrated that at these plants with branched conduits, conditions may develop when the load drop of one generating set results in the load drop of others, which are hydraulically connected with a common pressure line. Here, a second load drop occurs under more rigorous conditions than when alls sets of the group experience a simultaneous drop, which has always been considered a computational regime. The need for correction of the existing design manual for production regimes of power-plant regulation is formulated with consideration of regime specifics at pumped-storage power plants and the layout of their pressure conduits. [ABSTRACT FROM AUTHOR]

A model of the appearance and development of resonance phenomena in conduits at HPP, problems associated with pressure pulsations in analyses of transitional processes, and refinement of numerical models for analysis of loads on structures and equipment during design and operation of HPP are examined. [ABSTRACT FROM AUTHOR]

A mathematical description of a closed control system with allowance for pressure fluctuations in the head system, which makes it possible to analyze the regime stability of orthogonal generating sets at tidal electric power plants when operating in the complete range of heads, outputs, and rotational speeds, and to select parameters of the control system, is obtained for an orthogonal hydroturbine and a generator with a load regulator. [ABSTRACT FROM AUTHOR]

Conditions under which hydromechanical processes proceeded immediately prior to the start of and during the failure of the second generating set at the Sayano-Shushenskaya HPP are examined. [ABSTRACT FROM AUTHOR]