For 50MW turbinegenerator set NO.2 in Thermal Power Subdepartment under China Petrochemical Jinling Branch Company

a CMD3N type online vibration monitoring and analysing system has been researched and developed

the design of hardwares and softwares in the said system

as well as the functions of the said system being presented in detail. After putting the system into operation

the operational performance of the unit can directly be grasped

and common faults in operation

such as imbalance

misalignment

mechanical looseness

and oilfilm outofstability etc.

can be diagnosed

having functions to predict the operation conditions of unit.