| Identification of Transient and Permanent Faults |
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| 作者姓名： | 李幼仪 董新洲 孙元章 |
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| 作者单位： | DepartmentofElectricalEngineering,TsinghuaUniversity,Beijing100084,China |
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| 基金项目： | the National Natural Science Foundationof China(No.5 0 0 770 11) |
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| 摘 要： | A new algorithm was developed for arcing fault detection based on high-frequency current transients analyzed with wavelet transforms to avoid automatic reclosing on permanent faults. The characteristics of arc currents during transient faults were investigated. The current curves of transient and permanent faults are quite similar since current variation from the fault arc is much less than the voltage variation. However, the fault current details are quite different because of the arc extinguishing and reigniting. Dyadic wavelet transforms were used to identify the current variation since wavelet transform has time-frequency localization ability. Many electric magnetic transient program (EMTP) simulations have verified the feasibility of the algorithm.
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| 关 键 词： | 小波变换 短路电流 电磁过渡 电力系统 |
Identification of Transient and Permanent Faults |
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| LI Youyi,DONG Xinzhou ,SUN Yuanzhang.Identification of Transient and Permanent Faults[J].Tsinghua Science and Technology,2003,8(6):672-675. |
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| Authors: | LI Youyi DONG Xinzhou SUN Yuanzhang |
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| Institution: | LI Youyi,DONG Xinzhou **,SUN Yuanzhang Department of Electrical Engineering,Tsinghua University,Beijing 100084,China |
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| Abstract: | A new algorithm was developed for arcing fault detection based on high-frequency current transients analyzed with wavelet transforms to avoid automatic reclosing on permanent faults. The characteristics of arc currents during transient faults were investigated. The current curves of transient and permanent faults are quite similar since current variation from the fault arc is much less than the voltage variation. However, the fault current details are quite different because of the arc extinguishing and reigniting. Dyadic wavelet transforms were used to identify the current variation since wavelet transform has time-frequency localization ability. Many electric magnetic transient program (EMTP) simulations have verified the feasibility of the algorithm. |
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| Keywords: | autoreclosure fault arcs wavelet transform high-frequency current transients |
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