Since the two sets of Wujiangdu Hydropower Station Phase II went into operation
the vibration had gone beyond the standard seriously. Such an excessive oscillation is seldom seen among the domestic large hydroelectric generating sets. After remedial measures had been taken
such as trimming the axis
adjusting the thrust bearing stress
treating the rotor roundness and fastening the upper bracket base key
very little effect was produced. By the stability test
the cause of the vibration was found finally. The treatment measures are introduced in the article.