核电厂半速发电机在线振动测量值高原因分析

Analysis of High On-Line Vibration Measurement of Nuclear Power Half-Speed Turbo-Generator

针对国内某核电半速汽轮发电机在线振动测量值高的问题,从振动频谱、离线振动测量、电磁干扰验证以及固有频率敲击试验等进行分析;结果表明:振动传感器支架固有频率接近发电机工频的4次谐波形成共振,是在线振动测量值高的原因。

Aiming at the problem of the high on-line vibration of the nuclear power half-speed turbo-generator, this paper made a step-by-step analysis according to the vibration spectrum, off-line vibration test, electromagnetic interference verification, and natural frequency knock test. Finally a conclusion was made that the natural frequency of the sensor support setting is close to the four times harmonic wave of the generator operating frequency, resulting in sensor support setting resonance, which is the key reason of the high on-line vibration measurement.