The insulation of generator stator windings will be ageing

because it is subjected to the combined effects of electrical

thermal and mechanical stress.With the old generator set is increasing

it is particularly important that master the condition of insulation of the stator windings in time.This paper summarize the methods of insulation diagnosis and life prediction of the generator stator windings at home and abroad

and take a hydro-generator 18.5 MW/10.5 kV for an example

a practical method of the stator winding insulation diagnosis and life prediction is introduced on the basis of electrical parameters.