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变压器主保护新判据的研究
引用本文:何人望,谢伟,宋海燕,吴迅.变压器主保护新判据的研究[J].工矿自动化,2012,38(2):52-55.
作者姓名:何人望  谢伟  宋海燕  吴迅
作者单位:1. 华东交通大学电气与电子工程学院,江西南昌,330013
2. 湖南大学电气与信息工程学院,湖南长沙,410082
摘    要:针对传统的变压器主保护无法正确识别变压器励磁涌流与内部故障电流的问题,提出了一种基于差动电流间断角的变压器主保护新判据。该判据采用sym4小波变换对变压器励磁涌流及内部故障电流信号进行处理,得出两者在d1尺度下间断角的明显差异特征,从而可正确区分变压器励磁涌流与内部故障电流。仿真结果验证了该判据的有效性。

关 键 词:变压器主保护  小波变换  励磁涌流  故障电流  间断角

Research of a New Criterion of Main Protection of Transformer
HE Ren-wang , XIE Wei , SONG Hai-yan , WU Xun.Research of a New Criterion of Main Protection of Transformer[J].Industry and Automation,2012,38(2):52-55.
Authors:HE Ren-wang  XIE Wei  SONG Hai-yan  WU Xun
Affiliation:1(1.School of Electrical and Electronic Engineering of East China Jiaotong University,Nanchang 330013,China.2.College of Electrical and Information Engineering of Hunan University,Changsha 410082,China)
Abstract:In view of problems that traditional main protection of transformer cannot identify inrush current and internal fault current of transformer,the paper proposed a new criterion of main protection of transformer based on dead angle of differential current.The criterion uses sym4 wavelet transform to process inrush current and internal fault current of transformer and obtains obvious difference characteristics of dead angles of the both under d1 scale,so as to identify inrush current and internal fault current of transformer correctly.The simulation result validated effectiveness of the criterion.
Keywords:main protection of transformer  wavelet transform  inrush current  fault current  dead angle
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