FIELD: power plant engineering. SUBSTANCE: device has at least one pulsation sensor placed in casing near periphery of runner blades and connected through filter and amplifier to input of coincidence circuit, and output of the latter is connected through amplifier to indicating system; sensor is connected through matching amplifier to inputs of coincidence circuit through one intermediate and two extreme parallel circuits each incorporating parallel-connected tunable active band filter, amplitude discriminator, integrator, and electronic filter; runner speed sensor is connected, in addition, to filters of extreme and intermediate circuits through amplifier. EFFECT: improved design. 4 dwg
