电工电气
電工電氣
전공전기
ELECTROTECHNICS ELECTRIC
2012年
4期
33-37
,共5页
小电流接地系统%零序网络%相频特性%暂态零序电流%幅值比较
小電流接地繫統%零序網絡%相頻特性%暫態零序電流%幅值比較
소전류접지계통%령서망락%상빈특성%잠태령서전류%폭치비교
small current grounding system%zero-sequence network%phase frequency characteristic%transient zero-sequence current%am-plitude comparison
阐述了中性点非有效接地系统零序网络的相频特性，分析了故障线路首容性频段内暂态零序电流，指出正常区段两端的暂态零序电流幅值近似相同，故障区段两端的暂态零序电流上游的幅值远大于下游的幅值，并据此提出了比较相邻馈线终端装置（FTU）暂态零序电流幅值的故障定位方法。仿真分析表明，该方法对于中性点不接地或经消弧线圈接地系统均适用，能够很好地克服故障时刻和过渡电阻的影响。具有暂态零序电流幅值大、检测灵敏度高、数据传输量小且不需要时钟精确同步的特点。
闡述瞭中性點非有效接地繫統零序網絡的相頻特性，分析瞭故障線路首容性頻段內暫態零序電流，指齣正常區段兩耑的暫態零序電流幅值近似相同，故障區段兩耑的暫態零序電流上遊的幅值遠大于下遊的幅值，併據此提齣瞭比較相鄰饋線終耑裝置（FTU）暫態零序電流幅值的故障定位方法。倣真分析錶明，該方法對于中性點不接地或經消弧線圈接地繫統均適用，能夠很好地剋服故障時刻和過渡電阻的影響。具有暫態零序電流幅值大、檢測靈敏度高、數據傳輸量小且不需要時鐘精確同步的特點。
천술료중성점비유효접지계통령서망락적상빈특성，분석료고장선로수용성빈단내잠태령서전류，지출정상구단량단적잠태령서전류폭치근사상동，고장구단량단적잠태령서전류상유적폭치원대우하유적폭치，병거차제출료비교상린궤선종단장치（FTU）잠태령서전류폭치적고장정위방법。방진분석표명，해방법대우중성점불접지혹경소호선권접지계통균괄용，능구흔호지극복고장시각화과도전조적영향。구유잠태령서전류폭치대、검측령민도고、수거전수량소차불수요시종정학동보적특점。
This paper described the phase frequency characteristics of neutral point non-validity grounding system zero-sequence network, analyzing transient zero-sequence current within fault line first capacitive frequency band and pointing out that the transient zero-sequence amplitude of normal section＇s both ends is nearly the same, while the upper reaches of fault section is much larger than the lower ones. On the basis of this, a new fault positioning method was raised to compare adjacent FTU transient zero-sequence current amplitude. Simulation analysis shows that the method is adaptable to both neutral point grounding and through-arc-extinction coil grounding system, being able to overcome the influence of fault time and interim resistance, with large transient zero-sequence amplitude, high test sensitivity, small data transmission and non-clock accurate synchronous etc characteristics.
