The problems occurred in trial operation and commercial operation

such as serious shaft vibration of bearing no. 9 concerning the exciter

and somewhat large vibration of the low-pressure II rotor bearing etc. on 2×600 MW supercritical units of Huaneng Qinbei Power - Generation Co Ltd have serious influence upon safe operation of the said units. Through kinetic equilibrum of shafting system in the field

the shaft vibration of each bearing has achieved to a good level

and problems

such as generator’s stator and bearing structure resonance

as well as unsmooth expansion of lowpres-sure cyclinder for unit no. 2 etc. have been analysed.