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通过对一起蓄能机组核相过程引起的电压异常现象进行分析,确认引起该电压异常的原因是电磁式电压互感器与发电机出口断路器对地电容激发的分次谐波谐振引起的电压位移。利用仿真试验验证了该核相过程极易发生谐振故障,同时总结了不同谐振时电压位移的特点。针对目前蓄能电站采用系统电源完成核相工作的实际情况,提出在条件允许的情况下取消发电机出口断路器对地并联电容、选取伏安特性好的电压互感器、保证断路器三相合闸的同期性是防止谐振造成电压异常的预控措施;提出现场处置可采取临时改变参数方式避免谐振现象,所提出的措施和方案可以有效减少核相过程中发生电压异常现象的几率,为新建抽水蓄能电站提供一些经验。
By analyzing the voltage anomalies caused by the nuclear phase of a storage unit, it is confirmed that the voltage anomaly is caused by the voltage shift due to the subharmonic resonance induced by the capacitance of the electromagnetic voltage transformer and the generator outlet circuit breaker . The simulation test verifies that the nuclear phase is prone to resonance fault and the characteristics of voltage shift at different resonance are summarized. In view of the fact that the nuclear power station is operated by the system power supply of the existing storage plant, it is proposed to cancel the parallel capacitor to the ground of the outlet breaker of the generator under conditions permitting and to select the voltage transformer with good volt-ampere characteristic to ensure the three-phase closing Of the same period is to prevent the resonance voltage caused by abnormal precontrol measures; proposed field disposal can take temporary changes in parameters to avoid resonance phenomenon, the proposed measures and programs can effectively reduce the nuclear phase voltage anomalies in the probability of occurrence of new pumping Energy storage plant to provide some experience.