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At present, there is no relevant definition and requirement for the critical vibration zone of hydropower units. By summarizing and analyzing the operation stability of the unit, the definition of critical vibration zone is given. An on-line dynamic testing method for vibration region based on comprehensive stability index of hydropower units is proposed. For the two methods of dynamic on-line testing and manual setting in critical vibration zone, the operating time control functions are given respectively to ensure the safe operation of the unit and to improve the operation range and adjustability of the unit.

Research on On-line Dynamic Testing and Operation Time Control Method for Critical Vibration Zone of Water Turbine Generator Set