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结合小波包变换和5次谐波法的谐振接地系统综合故障选线方法

DOI: 10.13336/j.1003-6520.hve.2015.05.014, PP. 1519-1525

Keywords: 谐振接地系统,故障选线,小波包,5次谐波法,特征频带,故障特征值

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Abstract:

为了提高谐振接地系统单相接地故障选线的可靠性和准确性,提出了一种充分利用故障暂态信息的选线方法,综合考虑了故障线路与非故障线路零序暂态电流小波包分解系数的极性关系和模值关系,定义并计算了各条线路的故障特征值。在各特征频带相同时,可通过比较各线路的故障特征值直接得到选线结果;特征频带不一致时,结合5次谐波法和小波分析自适应地进行故障选线。随机设定了20种单相接地故障,并应用该选线算法进行选线,选线准确率达100%。说明该选线方法不受故障点位置、接地点过渡电阻和故障时刻的影响,具有很高的可靠性和准确度,且在有多回线-缆混合馈线的情况下,具有较高的选线效率。

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