Measurement arrangement for hydro turbine

A method for analyzing cavitation in a hydro turbine of a hydroelectric power plant, the method comprising:

• measuring, by using at least one motion sensor coupled to a rotor of the hydro turbine, motion of the rotor during operation of the hydro turbine to generate measurement data;
• acquiring, by at least one processor, the measurement data and one or more operational parameters of the hydro turbine employed during said measuring, the one or more operational parameters indicative of power supply of the hydro turbine;
• computing, by the at least one processor based on the measurement data and the operational parameters, at least one metric indicative of an effect of the cavitation on the hydro turbine;
• comparing, by the at least one processor, the at least one metric with at least one threshold and determining, based on the comparison, that the effect of the cavitation is too high;
• and
• outputting, by the at least one processor based on said determining, information indicating unsuitability of the one or more operational parameters,
• wherein the measurement data comprises acceleration data, the method further comprising computing, by the at least one processor, at least one of a first derivative, a second derivative, and a higher derivative of the acceleration data and computing the at least one metric based on the at least one of the first derivative, second derivative, and higher derivative of the acceleration data.

A non-transitory computer readable medium comprising computer program instructions that configure, when read and executed by a computer, the computer to analyze cavitation in a hydro turbine of a hydroelectric power plant, by performing operations comprising:

• measuring, by using at least one motion sensor coupled to a rotor of the hydro turbine, motion of the rotor during operation of the hydro turbine to generate measurement data;
• acquiring, by at least one processor, the measurement data and one or more operational parameters of the hydro turbine employed during said measuring, the one or more operational parameters indicative of power supply of the hydro turbine;
• computing, by the at least one processor based on the measurement data and the operational parameters, at least one metric indicative of an effect of the cavitation on the hydro turbine;
• comparing, by the at least one processor, the at least one metric with at least one threshold and determining, based on the comparison, that the effect of the cavitation is too high;
• and
• outputting, by the at least one processor based on said determining, information indicating unsuitability of the one or more operational parameters,
• wherein said acquiring, computing, and comparing are performed for a plurality of different sets of one or more operational parameters and for a plurality of different power supply regions, and wherein said outputting indicates at least one suitable set of one or more operational parameters and at least one unsuitable set of one or more operational parameters.