| 引用本文: | 朱晓娟,林圣,张姝,何正友.基于小波能量矩的高阻接地故障检测方法[J].电力自动化设备,2016,36(12): |
| ZHU Xiaojuan,LIN Sheng,ZHANG Shu,HE Zhengyou.High-impedance grounding fault detection based on wavelet energy moment[J].Electric Power Automation Equipment,2016,36(12): |
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| 摘要: |
| 中性点不接地中压配电网时常发生高阻接地故障，普通的零序电流保护难以对其检测。通过对仿真和实验得到的高阻接地故障电流信号进行频谱分析，发现其高频分量分布显著区别于系统其他扰动暂态信号。由此，引入小波能量矩算法，通过对高频段能量矩进行归一化、求和及取对数处理，提出了一种高阻接地故障的检测方法，该方法只需要利用故障后第1个工频周期内的电流信号，通过小波能量矩分析得到诊断判据，即可实现高阻接地故障的有效识别。大量的仿真和实测数据表明，该方法适应性强，且不受线路非高阻接地故障暂态信号的影响。 |
| 关键词: 配电网 高阻接地故障 高频分量 小波能量矩 介质 故障检测 |
| DOI：10.16081/j.issn.1006-6047.2016.12.025 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目(51307145)；四川省应用基础计划项目(2014JY0177) |
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| High-impedance grounding fault detection based on wavelet energy moment |
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ZHU Xiaojuan, LIN Sheng, ZHANG Shu, HE Zhengyou
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School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, China
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| Abstract: |
| HIGF(High-Impedance Grounding Fault) often occurs in the mid-voltage distribution network with ungrounded neutral point, which is hardly detected by normal zero-sequence current protection. The frequency spectrum of HIGF current obtained by simulation or experiment is analyzed, which shows that the distribution of its high-frequency components is obviously different from that of other disturbed transient signals. The wavelet energy moment algorithm is introduced, the energy moments of high-frequency components are normalized, summed and processed in logarithm, and a method for detecting HIGF is then proposed, which only carries out the wavelet energy moment analysis for the current signals of the first post-fault fundamental frequency cycle to get the detection criterion. Massive simulative and measured data show that, the proposed method has strong adaptability and is not affected by the non-HIGF transient signals of lines. |
| Key words: distribution network high-impedance grounding fault high-frequency component wavelet energy moment medium fault detection |
