In order to realize the condition monitoring

fault detection and ascertain early of wind turbine in working

a vibration observer in the process of gear transmission is established by using the rapidity of SIMULINK simulation

and it can output residual in real time.By setting threshold of residual

the wind turbine working stat ion real time on-line monitoring is realized.After the fault is discovered

the reassigned wavelet scalograms is used in the signal analysis

and it is realized to recognise and locate the faults fast.For verifying the conclusion and the relation among fault parameter

residual and system characterist ics

a simulated fault is introduced to the model.A way to discover fault early and forecast fault is provided.