During the operation of a biomass power plant generator,a sudden alarm signal for rotor grounding protection action suddenly occurred and the machine tripped.After the fault shutdown,the rotor windings excitation end was found to be grounded through the inspection of the pulled out rotor.After the rotor being returned to the factory,the cause of rotor fault was i-dentified through analyzing and troubleshooting the status and structural characteristics of grounding fault location,the residues and the insulation performance.This paper provides the suggestions for daily operation and maintenance of generators with same type,which can effec-tively prevent similar problems from recurring.
维普
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