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电网技术  2015 

基于并联电抗器差模电流波形特征的三相自适应重合闸永久性故障识别

DOI: 10.13335/j.1000-3673.pst.2015.04.038, PP. 1127-1132

Keywords: 并联电抗器,三相自适应重合闸,瞬时性故障,永久性故障,差模电流,衰减周期分量

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Abstract:

针对带并联电抗器的超高压输电线路,详细分析了发生两相或三相瞬时性及永久性故障时,故障相并联电抗器差模电流的特征在线路两端三相跳闸以后,对于瞬时性故障,故障点熄弧以后,差模电流中只存在衰减周期分量,对于永久性故障,差模电流中只存在衰减直流分量。利用差模电流的这一特性可以提出适用于三相自适应重合闸中相间故障性质识别的新判据,该判据只需利用单端并联电抗器电流即可实现,并且可以判定熄弧时刻。大量ATP/EMTP电磁暂态仿真表明,该方法能够快速准确地识别故障性质,且基本不受故障位置、过渡电阻、采样频率、负荷电流、故障时刻、跳闸时刻、故障点熄弧时刻等因素的影响,且同时适用于单端和双端带并联电抗器的输电线路。

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