| 用小波理论区分变压器的励磁涌流和短路电流的新原理 |
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| 引用本文： | 焦邵华,刘万顺,刘建飞,张振华,杨奇逊.用小波理论区分变压器的励磁涌流和短路电流的新原理[J].中国电机工程学报,1999,19(7):1-5,76. |
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| 作者姓名： | 焦邵华 刘万顺 刘建飞 张振华 杨奇逊 |
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| 作者单位： | 华北电力大学电力系,100085,北京 |
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| 摘 要： | 提出了一种基于小波理论的区分励磁涌流和短路电流的新原理。利用小波理论进行涌流特征提取，通过小波变换的模局部极大值的特性提取励磁涌流的间断角特征，在此基础上定性地区分励磁流和短路电流。
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| 关 键 词： | 变压器 差动保护 小波理论 励磁涌流 短路电流 |
A NEW PRINCIPLE OF DISCRIMINATION BETWEEN INRUSH CURRENT AND FAULT CURRENT OF TRANSFORMER BASED ON WAVELET |
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| Jiao Shaohua,Liu Wanshun,Liu Jianfei,Zhang Zhenhua,Yang Qixun.A NEW PRINCIPLE OF DISCRIMINATION BETWEEN INRUSH CURRENT AND FAULT CURRENT OF TRANSFORMER BASED ON WAVELET[J].Proceedings of the CSEE,1999,19(7):1-5,76. |
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| Authors: | Jiao Shaohua Liu Wanshun Liu Jianfei Zhang Zhenhua Yang Qixun |
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| Abstract: | A principle of discriminating the inrush current and fault current of the power transformers based on the Wavelet is presented in the paper. The dead angle is a dominant and essential characteristic of the inrush current. This feature is extracted from the local maxima of the wavelet transforms and described with fuzzy sets. All the conclusions are verified by the EMTP and the electric power system simulation in the lab of NCEPU and proved to be highly accurate and fast. |
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| Keywords: | inrush current wavelet transform digital transformer protection |
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