(EP519530-A1)      The setting of the guide vanes of the vane system varies with a given turbine blade setting of the runner, and the intensity of the timely fluctuations of the generator output is determined dependent on the guide vane setting. The guide vanes are then adjusted to that setting, with which the intensity fluctuations of the generator output assumes a min. value.    The intensity of the fluctuations of the generator output is determined in a specified frequency range and the frequency range is limited downwards by a high pass filter. The intensity of the fluctuations of the generator output is determined by the root mean square value build up of the power swing.    ADVANTAGE -   Automatic method which is quicker and less expensive than hitherto, for determining optimum parameters of double regulated water turbine. Parameters to be determined can be derived well and accurately.    (DE4124498-C2)      The appts. is for optimisation of the operational parameters of a water turbine. It has a distributor with adjustable blades, and a rotor with adjustable blades. The rotor is coupled to an electric generator. With any position of the rotor blades the position of the distributor blades is varied dependent upon the generator output.    Without taking into consideration the absolute value of the generator output, the intensity of the time variations of the output, is determined within a preset frequency range, dependent upon the distributor blade position. These blades are set to a position, in which the intensity of variations of the generator output is at a min.    ADVANTAGE -   Automatic, quicker, simpler method to determine optimum operational parameters.    (US5322412-A)      The method for optimising the operating parameters of a water turbine coupled to an electrical generator, involves determining the intensity of fluctuations over time of a measured value determined during operation of the water turbine, within a given frequency range, the measured value being a function of the position of the guide vanes. The latter are set to a position in which the fluctuations in intensity of the measured value, within the given frequency range, are at a minimum.    The measured value comprises a parameter obtained from an output of the electrical generator. The water turbine includes bearings, and the measured value comprises a parameter representative of bearing oscillations of the turbine, obtained by measuring the fluctuations of the instantaneous pressure exerted on the bearings.    ADVANTAGE -   Parameters can be recorded readily and accurately. Quick response to changes in operating conditions.    (EP519530-B1)      Procedure for optimising the working parameters of a hydraulic turbine comprising a distributor with adjustable guide blades and a runner which has adjustable turbine blades and is connected to an electric generator, where at a given position of the turbine blades of the runner the position of the guide blades of the distributor is varied, characterised in that the intensity of fluctuations in time of a measured value detected during the working of the hydraulic turbine is determined within a predetermined frequency band in dependence on the position of the guide blades, and the guide blades are set to a position at which the intensity fluctuations of the measured value are minimal.