In a 200 MW unit in the process of operation

abnormal vibration generator shaft with big load phase increases

generator hydrogen purity low failure.Through comparing the change of the generator bearing vibration track

develop the test plan and implement

on the basis of analysis and test data

for large generator bearing vibration fault diagnosis.Diagnostic results show that the reason for the generator rotor of the generator bearing vibration high hot bending load

lead to seal the reasons for the low hydrogen purity for vibration and shaft neck damage

hydrogen seal oil pollution.According to diagnosis

combining with the actual operation

at 7 watts slip ring and counter weight

on-site high speed dynamic balance

at the same time to repair of 6 wazhou neck

replace the seal 6

7 watts.Dynamic balance and repair results show that the generator bearing vibration has been effectively reduced

the hydrogen purity returned to normal.