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投稿时间：2010-09-10
投稿时间：2010-09-10
中文摘要: 提出了一种基于离散小波变换(DWT)并利用小波能熵作为判据来识别电力变压器励磁涌流和内部故障电流的方法.通过在MATLAB上搭建变压器空载合闸和匝间短路仿真模型,对其不平衡电流的小波功率谱进行分析,以验证这种新型判据的有效性.仿真结果表明,这种新型判据能够可靠地、快速地识别出励磁涌流和内部故障电流.
Abstract:A method to discriminate inrush from internal fault is proposed, which is based on discrete wavelet transform(DWT).And combining wavelet analysis with entropy theory, the new-type protection criterion formula is presented.The simulation model of no load switching and turn-to-turn fault is established by MATLAB.In this method, the wavelet power spectrums of disequilibrated current signals under the two abnormal operation conditions are analyzed.The results show that the new-type criterion, based on wavelet entropy, can identify differences between inrush current and internal fault reliably and rapidly.
keywords: DWT wavelet entropy wavelet power spectrum inrush criterion
文章编号：20100605 中图分类号： 文献标志码：
基金项目:
| 作者 | 单位 | |
| 严屹宏 | 华东交通大学 电气与电子工程学院, 江西 南昌 330013 | woshihonthonta@163.com |
| Author Name | Affiliation | |
| YAN Yi-hong | School of Electrical and Electronic Engineering, East China Jiaotong University, Nanchang 330013, China | woshihonthonta@163.com |
引用文本：
严屹宏.基于小波能熵的变压器励磁涌流的识别[J].上海电力大学学报,2010,26(6):534-536,558.
YAN Yi-hong.Identification of Transformer Inrush Current on the Basis of Wavelet Entropy[J].Journal of Shanghai University of Electric Power,2010,26(6):534-536,558.
严屹宏.基于小波能熵的变压器励磁涌流的识别[J].上海电力大学学报,2010,26(6):534-536,558.
YAN Yi-hong.Identification of Transformer Inrush Current on the Basis of Wavelet Entropy[J].Journal of Shanghai University of Electric Power,2010,26(6):534-536,558.