Abstract：The normal operation of the governor hydraulic servo system has great influences on the operating characteristics and economic performance indicators of the whole hydro unit. In the practical situations that only basic online-monitoring and fault diagnose are achieved in present governing system, based on the analysis of the physical structure, the operating principle and fault mechanism of the hydraulic servo was studied using the improved fault mode effects and critical analysis(FMECA)which is used for the clarity of the function, fault mode, fault reason and fault effect of the equipment to qualitative analysis, and the distributed physical grid model of the hydraulic servo was established. According to the characteristic indexes obtained by the simulation model, a fault diagnose method was proposed. Simulation analysis taken from the jam faults of hydrovalve in the starting up procedure was given, and based on the different output of the frequency, guide vane opening, electro-hydraulic converter and PID, the corresponding fault was estimated. From the case analysis, this method is proved to be simple, reliable and accurate,and the fault in the system can be allocated which provides the decision basis for the operating of high efficiency and daily maintenance.
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