针对某抽水蓄能电站首台机组调试阶段机组推力轴承镜板泵不能建压的问题,分析了可能产生的原因。在此基础上,测量了开机过程和额定转速情况下镜板泵流量和出口压力,分别采用短时傅里叶变换和傅里叶变换对压力信号进行分析,指出不同工况下镜板泵出口压力脉动的主频主要表现为泵孔通过频率,且镜板泵在中高转速下存在压力和流量不稳定区,应引起足够注意。 Aiming at the problem that the thrust bearing plate pump can not build pressure in the first stage of a pumped storage power station, the possible causes are analyzed. On this basis, the plate pump flow rate and outlet pressure were measured under the condition of the starting process and the rated speed. The pressure signals were analyzed by using the short-time Fourier transform and the Fourier transform respectively. The main frequency of pressure pulsation is mainly through the frequency of the pump hole, and plate pump at high speed under pressure and flow instability, should cause enough attention.