Exploratory Discussion on the Setting Principles of Overspeed Protection Values for Pumped Storage Units
This article provided a preliminary discussion on the purpose,significance,and setting principles of overspeed protection for hydroelectric generating units.The relevant characteristics of the speed variation curves of conventional Francis turbine generating units and pumped storage units when the units in the runaway conditions were analyzed and compared.The steady-state runaway speed of pumped storage units and the highest transient speed of pumped storage units after load rejection were analyzed and studied.The setting principles and methods of the mechanical overspeed protection value and the electrical protection values were proposed for the pumped storage units.Moreover,combining with an actual engineering case,this setting method was applied to calculate and analyze the setting value of the overspeed protection for the pumped storage unit,the engineering practicality of this setting principle was verified.
pumped storage unittransient process simulationrunaway speed characteristicsoverspeed protection valuessetting principles
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