CAJ | 학술논문

基于谐振接地系统单相接地故障暂态等值电路,从理论上详细分析了故障电阻变化时系统暂态特性的变化情况,得出在故障电阻较小时系统处于欠阻尼状态,随着故障电阻的增大,系统进入过阻尼状态,最后又过渡到另一种等值电路下的欠阻尼状态。建立了含电缆线路的谐振接地系统模型,仿真分析了电缆线路的引入,以及故障初相角、故障距离、故障电阻变化时,暂态零序电流及其频谱特征的变化规律。仿真结果表明：电缆线路的引入将使暂态电流频谱主成分向低频段移动;故障电阻的大小对含电缆线路的谐振接地系统单相接地故障暂态电流频谱特征影响很大。
기우해진접지계통단상접지고장잠태등치전로,종이론상상세분석료고장전조변화시계통잠태특성적변화정황,득출재고장전조교소시계통처우흠조니상태,수착고장전조적증대,계통진입과조니상태,최후우과도도령일충등치전로하적흠조니상태。건립료함전람선로적해진접지계통모형,방진분석료전람선로적인입,이급고장초상각、고장거리、고장전조변화시,잠태령서전류급기빈보특정적변화규률。방진결과표명：전람선로적인입장사잠태전류빈보주성분향저빈단이동;고장전조적대소대함전람선로적해진접지계통단상접지고장잠태전류빈보특정영향흔대。
Based on the equivalent circuit of a resonant grounded system,the changes of the transient characteristics are analyzed theoretically when the fault resistance changes.The study indicates that the circuit is under-damped firstly,then it enters the damping state,and finally makes the transition to under-damped state.A resonant circuit model with cables is established,and the changing law of the zero-sequence transient current spectrum is analyzed when the cables are added to the distribution network and when the fault angle,fault resistance and fault distance are changed.Simulation results show that the adding of cables makes the spectrum of zero-sequence transient current move to a lower-band.Fault resistance has great influence on the spectrum of zero-sequence transient current.