电压互感器铁磁谐振引起的基波定子接地保护动作分析

摘要

Combined with the actual operation of power plant in one case due to the terminal electromagnetic voltage transformer ferroresonance "unreal grounding" phenomenon caused by the action of stator grounding protection,from the protection principle,protection action report,records the detailed analysis of the stator ground protection action,and detailed analysis on TV ferromagnetic resonance principle,characteristic,when the system parameters meet the fundamental resonant conditions,cause the fundamental resonance produced "unreal grounding" phenomenon in the stimulation of the external cause.Finally put forward the measures of eliminating harmonics terminal TV ferroresonance and the matters needing attention,to ensure safe and reliable operation of generating unit.%结合发电厂实际运行中出现的一例由于机端电磁式电压互感器铁磁谐振引起的“虚幻接地”现象造成基波定子接地保护动作,从保护原理、保护动作报告、录波信息详细分析了定子接地保护动作行为,并对TV铁磁谐振原理、特点进行详细分析,当系统参数符合基波谐振的条件,在外部原因的激发下引起基波谐振产生“虚幻接地”现象.最后提出机端TV铁磁谐振的消谐措施及注意事项,以保证发电机组安全可靠运行.