抽水蓄能机组水轮机工况启动时机组及厂房振动时频分析

Time-frequency analysis of unit and hydropower house vibration of pumped storage unit in start-up process of hydraulic turbine operating condition

对抽水蓄能机组水轮机工况启动过程中,机组摆度、振动、厂房振动、压力脉动随转速变化的时频特性进行了试验研究。研究结果表明,当抽水蓄能机组水轮机工况启动时,机组升速过程中,机组摆度信号有明显的转频及倍频分量;机组振动速度信号、电站厂房振动信号有明显的3倍叶片过流频率;压力脉动信号主频与转速没有明显的关系,具有低频随机脉动特性。

The time-frequency characteristics of the unit's swing,vibration,hydropower house vibration and pressure fluctuation are studied with the change of the rotating speed of the pumped storage unit in the start-up process of hydraulic turbine operating condition.The results show that when the hydraulic turbine operating condition starts,the unit swing signal has obvious rotating frequency and its harmonics in the process of speeding up the unit.The unit vibration signals and the hydropower house vibration signalshavethree times the hydraulic turbine blade passing frequency obviously.There is no obvious relationship between the main frequencies,the pressure fluctuation signaland the rotating speed of the unit.The pressure fluctuation has low frequency random fluctuation characteristic.