DIAGNOSIS AND TREATMENT FOR UNSTABLE VIBRATION OF A DUAL INTERNAL WATERCOOLING GENERATOR SET[J]. Thermal power generation, 2005, (10). DOI: 10.19666/j.rlfd.2005.10.017.
excessive vibration affects safe operation of the said unit.Through test and analysis
it is found out that the causes leading to vibration of said unit are as follows:(1)nonuniform cooling of coolingwater pipe for rotor in the generator;(2)mass unbalance between lowpressure rotor of the turbine and rotor of the excitor;thereby.resulting in occurrence of generator rotor’s hot bending
and exceeding vibration of bearings no.4 and 8 beyond standard limit during operation time of said unit.After taking some measures
such as backwashing of internal cooling water pipes for generator’s rotor
and adjusting the shafting balance etc.
the problem of unit vibration has been temporaryly eliminated.