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电缆接地行波辨识方法研究
供稿: 李文宏;刘琳;管廷强;刘子敬 时间: 2018-11-26 次数:

作者:李文宏刘琳管廷强刘子敬

作者单位:山东科技大学济南校区电气信息系

摘要:为节约空间,矿井多采用电缆传输供电.基于接地行波原理实现电缆接地故障测距与保护是研究热点,以及接地行波发生时刻不易捕捉等,通过分析电缆接地行波的暂态过程,得出对于特定频段的接地行波暂态过程是严格意义上的自相似过程,进一步提出基于二次样条的正交小波基对行波信号进行分形辨识算法.试验证明,对于行波测试信号进行分形后,能够辨识出接地电流行波,从而捕捉到行波发生的时刻,说明该方法有效.

关键词:单相接地故障;行波;小波分形;辨识;

DOI:10.16186/j.cnki.1673-9787.2013.05.011

分类号:TM863

Abstract:With the continuous improvement of transmission line voltage level, the traveling wave principle oriented localization and protection of cable ground faults became a hot research topic.However, the occurrence moment of traveling wave is not easy to be captured.By analyzing the transient process of the traveling wave induced by cable ground faults, we conclude that the transient process of traveling wave on specific bandwidth is a self-similar process in a strict sense and further proposed a fractal identification algorithm based on quadratic spline orthogonal wavelet.It was proved by experiment that both the waveform on different scales and the traveling wave distinguishing the occurrence moment can be obtained after the fractal identification for the traveling-wave test signal.

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