Cavitation Vibration Monitoring in the Kaplan Turbine

Cavitation is a common damage phenomenon in running hydraulic turbines. In order to meets the needs of hydraulic turbine cavitation monitoring, an experimental investigation, which according to high frequency vibration induced by cavitation, has been carried out on a Kaplan turbine. Four high-level accelerometers with 53 kHz natural frequency have been mounted on the turbine, and four data acquisition channels work at the same time. The investigations have been carried out on the output of no- load, 30 MW, 66 MW, 100 MW, 115 MW and 130 MW. The analysis results show that the adopted implements can accurately seize the cavitation signal, and the 115 MW output in the 21.05-meter working head is suitable for the continued operation. This conclusion gives a reference for the hydraulic turbine stable running.