Abnormal vibration of generator bearings is a common problem in power systems, which may lead to equipment damage, decreased operating efficiency, and even accidents. Therefore, it is crucial to inspect and diagnose the abnormal vibration of generator bearing shells. Here is a detailed introduction to some possible causes of abnormal vibration of generator bearings, which can be used for troubleshooting.

Firstly, axial imbalance is a common cause of generator bearing vibration. Axial imbalance may be caused by factors such as bearing wear, journal wear, or impeller imbalance.

Secondly, radial imbalance is also one of the reasons for the vibration of generator bearings. Radial imbalance may be caused by factors such as blade damage, disc imbalance, or bearing seat displacement.

Bearing failure is also one of the reasons for the vibration of generator bearing shells. Bearing failures may be caused by factors such as bearing wear, aging of bearing grease, or intrusion of foreign objects. Regularly remove bearing grease for inspection, observe its color and texture. Use an oil analyzer to detect metal particles and pollutants in fats and oils. Meanwhile, check for wear and damage to the bearings.

Mechanical looseness is also one of the reasons for the vibration of generator bearings. Mechanical looseness may be caused by factors such as loose fasteners or poor component connections. Check the tightness of all fasteners to ensure they are securely connected. Perform vibration analysis on connecting components to detect looseness.

Temperature changes may also cause vibration of generator bearings. Temperature changes may be caused by factors such as changes in cooling water temperature or environmental temperature. Monitor the cooling water temperature and ambient temperature, and analyze their impact on vibration. Meanwhile, check if the vibration sensor and data acquisition system are working properly.

Imbalance of electromagnetic force may also cause vibration of generator bearings. Electromagnetic force imbalance may be caused by factors such as generator winding faults or uneven air gaps. Use an electromagnetic tester to test the electrical parameters of the generator winding. Measure the eccentricity of the rotor and check if the air gap is even.

Poor lubrication is also one of the reasons for the vibration of generator bearings. Poor lubrication may be caused by factors such as insufficient lubricating oil supply or poor oil quality. Check the pressure and flow rate of lubricating oil to ensure adequacy. Regularly sample and analyze the oil quality to check for pollutants and metal particles.

Structural resonance is also one of the reasons for the vibration of generator bearings. Structural resonance may be caused by factors such as matching the natural frequency of the system with external excitation frequencies. Perform spectrum analysis to determine if there are vibrations that match the natural frequency of the system.

In addition to the above reasons, some external factors may also cause generator bearing vibration, including wind, earthquake, or other vibration sources near the equipment. Check if the vibration sensor is affected by external interference. Monitor the surrounding environment to determine if there are any other sources of vibration.

For each cause, detailed inspection and diagnosis should be carried out based on the actual situation, and professional instruments and software should be used to assist in analyzing data, in order to accurately determine the cause of the fault and take corresponding measures for repair.

There are many other spare parts for Generator, Steam Turbine, Boilers of 300MW, 600MW, or 660MW power plants such as below:
Steam turbine ENCLOSURE
Generator pulley
Coal mill Guard Cover 20MG40.11.09.03
Coal mill Roller core 300MG41.11.09.94S
Coal mill Wear plate 20MG40.11.09.72J
Steam turbine Special Grooved Nut
Coal mill Guide Block 20MG40.11.12.07.96
Generator Rubber gasket for cooler
Generator Stator assembly
Steam turbine ROD , LIFTING , FOR BFPT
Coal mill Oil cooler BRO(1)05-4-A
Forced-draft blower Cooling Sealing fan assembly for Booster Fan TY900600 T9