CAJ | 학술논문

从本地系统产生谐振的实例出发,分析了电压互感器产生铁磁谐振的机理,包括直接接地系统对地电容引发的铁磁谐振、不接地系统单相接地引起的铁磁谐振和断路器接口并联的电容形成的铁磁谐振.找出了产生谐振的4个方面的具体原因.并从产生谐振的机理出发,全面阐述了消除谐振的8项措施,如在倒母线的操作中增加馈出线路的长度;在电压互感器一次侧中性点接地线上投入电阻;安装零序电压互感器;装设消谐器等.根据谐振的程度大小和出现谐振的具体原因,恰当运用这些措施,就能确保系统的可靠运行.
종본지계통산생해진적실례출발,분석료전압호감기산생철자해진적궤리,포괄직접접지계통대지전용인발적철자해진、불접지계통단상접지인기적철자해진화단로기접구병련적전용형성적철자해진.조출료산생해진적4개방면적구체원인.병종산생해진적궤리출발,전면천술료소제해진적8항조시,여재도모선적조작중증가궤출선로적장도;재전압호감기일차측중성점접지선상투입전조;안장령서전압호감기;장설소해기등.근거해진적정도대소화출현해진적구체원인,흡당운용저사조시,취능학보계통적가고운행.
The mechanism of PT ferroresonance is analyzed with the local system instances introduced by the system-earth capacitance in solid grounding system,the single-phase grounding of non-grounding system and the parallel capacitor of breaker. 4 causes of ferroresonance are found and 8 countermeasures are proposed :increase the length of output wire for bus transition ,insert resistor into the neutral grounding line at PT primary side,instaU zero-sequence PT,fix resonance depressor,etc. For the reliable operation of electric power system,it is helpful to implement favorable countermeasures according to the degree and cause of ferroresonance.