| 引用本文: | 吴乐鹏,黄 纯,林达斌,朱智军,蒋洪涛.基于暂态小波能量的小电流接地故障选线新方法[J].电力自动化设备,2013,33(5): |
| WU Lepeng,HUANG Chun,LIN Dabin,ZHU Zhijun,JIANG Hongtao.Faulty line selection based on transient wavelet energy for non-solid-earthed network[J].Electric Power Automation Equipment,2013,33(5): |
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| 摘要: |
| 为解决小电流接地系统在相电压过零点附近发生故障选线不准确的问题，在详细分析小电流接地系统暂态零序网络故障特性后，提出了一种新的基于暂态小波能量的小电流接地系统选线新方法。首先将各馈线暂态零序电流进行小波变换；再利用小波系数计算小波高频能量和小波低频能量；最后根据相电压峰值附近故障和过零点附近故障时故障信号能量谱特征不同，通过比较小波高频能量或小波低频能量极大值进行选线。采用EMTP进行大量仿真，结果表明，该方法不受故障合闸角、故障距离、过渡电阻、电弧及系统运行方式等因素的影响，在线路末端发生单相高阻接地或在相电压过零点附近发生故障时均可以准确可靠选线。 |
| 关键词: 小电流接地系统 单相接地故障 故障选线 小波能量 EMTP 接地 仿真 |
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| 基金项目:国家高技术研究发展计划（863计划）资助项目（2010-AA0522555001）；湖南省自然科学基金资助项目（10JJ5055）；教育部留学回国人员科研启动基金资助项目（[2010］1174） |
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| Faulty line selection based on transient wavelet energy for non-solid-earthed network |
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WU Lepeng, HUANG Chun, LIN Dabin, ZHU Zhijun, JIANG Hongtao
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College of Electrical and Information Engineering，Hunan University，Changsha 410082，China
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| Abstract: |
| The fault characteristics of transient zero-sequence network are analyzed in detail，which demonstrates that，the energy spectrum of fault near phase-voltage peak is different from that of fault near zero-crossing point. Aiming at the inaccurate selection of faulty line of non-solid-earthed network when fault occurs near the zero-crossing point of phase voltage，a method of faulty line selection based on transient wavelet energy is proposed，which carries out the wavelet transform of transient zero-sequence current for each feeder，calculates the high- and low-frequency wavelet energies according to the wavelet coefficients，and selects the faulty line according to the maximum value of high- or low-frequency energy. Results of EMTP simulation show that，the proposed method is immune to the closing angle，fault distance，transition resistance，arc，system operating mode，etc.，and the faulty line can be accurately and reliably selected when the single-phase grounding fault occurs with high resistance at the end of line or the fault occurs near the zero-crossing point of phase voltage. |
| Key words: non-solid-earthed network single-phase grounding fault faulty line selection wavelet energy EMTP electric grounding computer simulation |
